# List of the Paleozoic life of Oklahoma

This list of the Paleozoic life of Oklahoma contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Oklahoma and are between 541 and 252.17 million years of age.

## A

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Abludoglyptocrinus
* †Abyssocrinus
** †Abyssocrinus antiquus
* †Abyssomedon – type locality for genus
** †Abyssomedon williamsi – type locality for species
* †Acanthobolbina
** †Acanthobolbina loeblichi
* †Acanthocladia
** †Acanthocladia ouachitensis
* †Acanthocrania
** †Acanthocrania erecta
** †Acanthocrania oklahomensis
** †Acanthocrania subquadrata
* †Acanthopecten
** †Acanthopecten grandis – type locality for species
* †Acanthospirina
* †Acanthotriletes
* †Acheloma
** †Acheloma cumminsi – or unidentified comparable form
** †Acheloma dunni – type locality for species
* †Acidiphorus
** †Acidiphorus williamsi – or unidentified comparable form
* Illustration of a fossilized skull in multiple views of the Permian primitive reptile Acleistorhinus †Acleistorhinus – type locality for genus
** †Acleistorhinus pteroticus – type locality for species
* †Acolocrinus
** †Acolocrinus crinerensis
* †Actinotodissus
** †Actinotodissus longitaleosus
* †Adairia
** †Adairia adairensis – type locality for species
* †Adornofusa
** †Adornofusa microhapsis
* †Aechmina
** †Aechmina geneae
** †Aechmina longispina
** †Aechmina truncata – tentative report
* †Aechminaria
** †Aechminaria ambigua
** †Aechminaria longispina
** †Aechminaria truncata – tentative report
* †Aechminella
** †Aechminella buchanani – type locality for species
** †Aechminella trispinosa – type locality for species
* †Affinocrinus
** †Affinocrinus grandis – type locality for species
** †Affinocrinus normalis
** †Affinocrinus orbis – type locality for species
** †Affinocrinus politus – type locality for species
** †Affinocrinus progressus – type locality for species
* †Alatisporites
** †Alatisporites pustulatus
* †Albertoceras
** †Albertoceras minimum
* †Alcimocrinus
** †Alcimocrinus girtyi
* Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris †Alethopteris
** †Alethopteris ambigua
** †Alethopteris lesquereuxii
** †Alethopteris serlii
** †Alethopteris sullivantii
* †Alexandrinia
** †Alexandrinia directa – type locality for species
* †Alisporites
** †Alisporites aequus – type locality for species
** †Alisporites zapfei
* †Allocrinus
** †Allocrinus divergens
** †Allocrinus globulus
** †Allocrinus irroratus
* †Alloiopteris
* †Allorisma
** †Allorisma albequus
** †Allorisma maynardwhitei – type locality for species
** †Allorisma snideri – type locality for species
* †Allotropiophyllum – or unidentified comparable form
* †Amarixys
** †Amarixys gracilis
* †Amaurotoma – tentative report
** †Amaurotoma knighti – type locality for species
* †Ameura
** †Ameura major
* Ammobaculites
* Ammodiscus
* †Ammovertella
** †Ammovertella inversa
* †Ampelocrinus
** †Ampelocrinus convexus
* †Amphilichas
** †Amphilichas subpunctatus
* †Amphipsalidocrinus
* †Amphiscapha
** †Amphiscapha catilloides
* †Amphisella
* †Amphissites
** †Amphissites bradfieldi – type locality for species
** †Amphissites bushi – type locality for species
** †Amphissites marginiferus
** †Amphissites miseri – type locality for species
** †Amphissites nodosus
** †Amphissites rugosus
** †Amphissites wapanuckensis
* †Amphistrophia
** †Amphistrophia prolongata
* †Amsdenina
* †Amsdenoides
* †Amygdalocystites
** †Amygdalocystites florealis
** †Amygdalocystites tribrachiatus
* †Anabathra
** †Anabathra pulcherrima
* †Anachoropteris
** †Anachoropteris gillotii
** †Anachoropteris involuta
* †Anachroropteris
** †Anachroropteris involuta
* †Ananaspis
** †Ananaspis guttulus
* †Anapiculatasporites
** †Anapiculatasporites spinosus
* †Anapiculatisporites
** †Anapiculatisporites edgarensis
** †Anapiculatisporites spinosus
* †Anaplanisporites
* †Anasobella
* †Anastrophia
** †Anastrophia delicata
** †Anastrophia grossa – type locality for species
* †Anataphrus
** †Anataphrus kermiti – type locality for species
* †Anatiferocystis
** †Anatiferocystis papillata
* †Anchicrinus
** †Anchicrinus echinosacculus – type locality for species
** †Anchicrinus planulatus – type locality for species
** †Anchicrinus rugosus
* †Ancistrorhyncha
** †Ancistrorhyncha costata
** †Ancistrorhyncha globularis
* †Ancoradella
** †Ancoradella ploeckensis
* †Anematina
* †Angelosaurus
** †Angelosaurus romeri – type locality for species
* †Anguisporites
** †Anguisporites contortus – type locality for species
** †Anguisporites intonsus – type locality for species
* † Anisophyllum
* Fossil of the Carboniferous horsetail relative Annularia †Annularia
** †Annularia sphenophylloides
** †Annularia stellata
* †Anobasicrinus
** †Anobasicrinus obscurus
* †Anolotichia
** †Anolotichia deckeri
** †Anolotichia impolita
** †Anolotichia spinulifera
* †Anomalogramma
** †Anomalogramma parva
* †Anomalohymen – type locality for genus
** †Anomalohymen dochmus – type locality for species
* †Anomalorthis
** †Anomalorthis oklahomensis
* †Anomphalus
* †Anthracoceras
** †Anthracoceras oklahomense – type locality for species
* †Anthracocrinus
** †Anthracocrinus primitivus
* †Anthraconeilo
** †Anthraconeilo taffiana
* †Anthracospirifer
** †Anthracospirifer opimus
* †Anthracotarbus – type locality for genus
** †Anthracotarbus hintoni – type locality for species
* †Anthyrsis
* †Antiquatonia
* †Antirhynchonella
** †Antirhynchonella thomasi
* †Anulocrinus
** †Anulocrinus drummuckensis – or unidentified related form
* †Apachella
** †Apachella capertoni – type locality for species
* †Aparchites
** †Aparchites maccoyii
** †Aparchites millepunctatus
** †Aparchites perforata
* †Aphlebia
* †Apianurus
* †Apiculatasporites
** †Apiculatasporites latigranifer
** †Apiculatasporites setulosus
** †Apiculatasporites spinulistratus
* †Apodasmocrinus
** †Apodasmocrinus daubei
* †Apographiocrinus
* †Apotocardium
** †Apotocardium lanterna
** †Apotocardium plautum
* †Apsidoneura
** †Apsidoneura flexa
* †Arakespongia – type locality for genus
** †Arakespongia mega – type locality for species
* †Araucarites
* †Arbucklecystis
* Fossilized shell and spines of the Late Devonian-Permian sea urchin Archaeocidaris †Archaeocidaris
** †Archaeocidaris megastyla
* †Archaeocrinus
** †Archaeocrinus lacunosus – or unidentified comparable form
** †Archaeocrinus subglobosus
** †Archaeocrinus subovalis
* Archaeolithophyllum
* †Archaeophiomusium
** †Archaeophiomusium burrisi
* †Archaeoscyphia
** †Archaeoscyphia annulata
* †Archeria
** †Archeria victori – type locality for species
* Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes
** †Archimedes ardmorensis – type locality for species
** †Archimedes distans
** †Archimedes meekanoides
** †Archimedes meekanus – or unidentified comparable form
** †Archimedes perminimus – or unidentified related form
** †Archimedes pitkinensis – type locality for species
** †Archimedes pseudoswallovanus – type locality for species
** †Archimedes sublaxus – or unidentified comparable form
* †Ardmosteges – type locality for genus
** †Ardmosteges orchamus – type locality for species
* †Arkacrinus
** †Arkacrinus constrictus – type locality for species
** †Arkacrinus dubius
* †Arkanites
** †Arkanites relictus
* †Arthropora
** †Arthropora simplex
* †Artinska
** †Artinska clara
** †Artinska ovata
* †Asaphocrinus
** †Asaphocrinus densus
* †Ascograptus
* †Asketopalla
** †Asketopalla formosula
* †Aspidosaurus – or unidentified comparable form
* †Astartella
** †Astartella concentrica
** †Astartella vera
* †Asterophyllites
* †Asthenohymen
** †Asthenohymen apicalis – type locality for species
** †Asthenohymen latus – type locality for species
** †Asthenohymen minutus – type locality for species
** †Asthenohymen parvulus – type locality for species
** †Asthenohymen triangularis – type locality for species
* †Astraeospongium
* †Astrocystites
* †Atactoporella
** †Atactoporella bellula
* †Atelelasma
** †Atelelasma oklahomense
* †Athlocrinus
** †Athlocrinus dejustus – type locality for species
* †Athyris
* †Atokacrinus
** †Atokacrinus tumulosus – type locality for species
* †Atrapocrinus – type locality for genus
** †Atrapocrinus mutatus – type locality for species
* †Atribonium
** †Atribonium evexum – or unidentified comparable form
* Fossilized shell of the Late Ordovician-Carboniferous brachiopod Atrypa †Atrypa
** †Atrypa arctostriata
** †Atrypa oklahomensis
** †Atrypa tennesseensis
* †Atrypina
** †Atrypina hami
* †Aulacotheca – or unidentified comparable form
* †Aurimorpha
** †Aurimorpha varia
* †Auriptygma
* †Austinella
** †Austinella multicostella
* Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten †Aviculopecten
** †Aviculopecten halensis
** †Aviculopecten multilineatus
** †Aviculopecten nodocosta – type locality for species
** †Aviculopecten tomlinsoni – type locality for species
* †Avonia – tentative report
** †Avonia snideri – type locality for species
** †Avonia spinosa – type locality for species
* †Axinolobus

## B

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Bactrites
** †Bactrites smithianus
* †Bactrocrinites
** †Bactrocrinites oklahomensis
* †Baeotherates – type locality for genus
** †Baeotherates fortsillensis – type locality for species
* †Baiosoma
** †Baiosoma batilia – type locality for species
* Bairdia
** †Bairdia ardmorensis – type locality for species
** †Bairdia billjohnsoni – type locality for species
** †Bairdia croneisi – type locality for species
** †Bairdia folgeri
** †Bairdia forakerensis
** †Bairdia multihilosa – type locality for species
* †Bairdiocypris
* †Bairdocypris – tentative report
** †Bairdocypris transversus
* †Balticella
** †Balticella deckeri
** †Balticella elongata
* †Baltisphaeridium
** †Baltisphaeridium accinctum
** †Baltisphaeridium bystrentos
** †Baltisphaeridium disparicanale
** †Baltisphaeridium parvigranosum
** †Baltisphaeridium trophirhapium
* †Barycrinus – tentative report
** †Barycrinus herculeus – or unidentified related form
* †Bascomella
** †Bascomella gigantea – or unidentified comparable form
* †Bathysiphon
* †Bathyurellus
** †Bathyurellus arbucklensis
** †Bathyurellus inflatus
* †Bathyurus
** †Bathyurus superbus
* †Batostoma
** †Batostoma chapparsi
** †Batostoma chazyensis
** †Batostoma cumingsi
** †Batostoma ramosa
** †Batostoma sheldonensis
** †Batostoma winchelli
* †Beecheria
* †Beedeina
* †Bellazona
** †Bellazona bella
* Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon †Bellerophon
** †Bellerophon wewokanus
* †Bellimurina
** †Bellimurina compressa
** †Bellimurina subquadrata
* †Belodella
** †Belodella silurica
* †Benthamaspis
** †Benthamaspis mediacrista – or unidentified comparable form
** †Benthamaspis onomeris
** †Benthamaspis rhochmotis
* †Berestovia
* †Bicornella
** †Bicornella tricornis
** †Bicornella unicornis – type locality for species
* †Bigalea
* †Bilinguites
** †Bilinguites eliasi – type locality for species
* †Bisatoceras – type locality for genus
** †Bisatoceras primum – type locality for species
* †Bistomiacystis
* †Boesites
** †Boesites girtyi
* †Bolbocephalus
** †Bolbocephalus convexus – or unidentified comparable form
** †Bolbocephalus jeffersonensis
** †Bolbocephalus myktos
** †Bolbocephalus stitti
* †Bollia
* Illustration of a fossilized skull of the Permian primitive reptile Bolosaurus †Bolosaurus
** †Bolosaurus grandis – type locality for species
** †Bolosaurus striatus
* †Bolterpeton – type locality for genus
** †Bolterpeton carrolli – type locality for species
* †Borestus
** †Borestus pagoda – type locality for species
* †Bothriocidaris
* †Botryocrinus
** †Botryocrinus parcus
* †Botryopteris
** †Botryopteris forensis
** †Botryopteris mediatena
** †Botryopteris tridentata
* †Brabeocrinus
** †Brabeocrinus primus – type locality for species
* †Brachydegma – tentative report
** †Brachydegma caelatum
* †Brachymimulus
** †Brachymimulus americanus
* †Brachyprion
** †Brachyprion arata
** †Brachyprion attenuata
** †Brachyprion gibber
** †Brachyprion gibbera – type locality for species
* †Brachythyris
** †Brachythyris chouteauensis
* †Bradyina
* †Bransonella – type locality for genus
** †Bransonella tridentata – type locality for species
* †Breileenia
** †Breileenia minnewankensis
* †Brevilamnulella
** †Brevilamnulella thebesensis
* †Bromidechinus – type locality for genus
** †Bromidechinus rimaporus – type locality for species
* †Bromidella
** †Bromidella reticulata
* †Bromidocrinus
* †Bromidocystis
* †Buckhornia
** †Buckhornia carteri
* †Bumastoides
** †Bumastoides milleri – or unidentified comparable form
* †Buxtonia
** †Buxtonia incurvatus
** †Buxtonia semicircularis
** †Buxtonia suttoni – type locality for species
* Bythocypris
** †Bythocypris cylindrica
** †Bythocypris kershavii
** †Bythocypris spinosa
** †Bythocypris tomlinsoni
* †Bythopora
** †Bythopora subgracilis

## C

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Life restoration of the Permian amphibian Cacops †Cacops
** †Cacops morrisi – type locality for species
** †Cacops woehri – type locality for species
* †Cadiospora
** †Cadiospora magna
* †Caenanoplia
** †Caenanoplia burlingtonensis
* †Calamaspora
** †Calamaspora breviradiata – or unidentified comparable form
* Fossilized stems from the Carboniferous-Permian horsetail relative Calamites †Calamites
* †Calamospora
** †Calamospora breviradiata
** †Calamospora hartungiana
** †Calamospora liquida
** †Calamospora mutabilis
** †Calamospora pedata
** †Calamospora straminea
* †Calathium
* †Calceocrinus
** †Calceocrinus humilis
* †Callipteris
* †Callistophyton
** †Callistophyton boyssetii
* †Calohymen – type locality for genus
** †Calohymen permianus – type locality for species
* †Calycocrinus
** †Calycocrinus furnishi – type locality for species
** †Calycocrinus symmetricus – type locality for species
* Fossil of the Early Ordovician-Early Devonian trilobite Calymene †Calymene
** †Calymene clavicula
* †Calyptaulax
** †Calyptaulax annulata
* †Camarophorella
* †Camarotoechia
** †Camarotoechia altisulcata
** †Camarotoechia carmelensis
** †Camarotoechia filistriata
** †Camarotoechia haraganensis
** †Camarotoechia oklahomensis
* † Camerate
* †Camerella
** †Camerella anteroplicata
** †Camerella oklahomensis
* †Camorphoria
* †Campbelloceras
* †Cancelloceras
** †Cancelloceras huntsvillense – type locality for species
* †Cancrinella
** †Cancrinella boonensis
* †Caneyella
* †Capnophyllum
* †Captorhinikos
** †Captorhinikos chozaensis
** †Captorhinikos parvus – type locality for species
** †Captorhinikos valensis
* Fossilized skeletons of the Permian reptile Captorhinus †Captorhinus
** †Captorhinus aguti
** †Captorhinus kierani – type locality for species
** †Captorhinus laticeps – type locality for species
** †Captorhinus magnus – type locality for species
* †Carabocrinus
** †Carabocrinus loeblichi
** †Carabocrinus logani
** †Carabocrinus treadwelli
** †Carabocrinus tumidus
** †Carabocrinus vancortlandi – or unidentified comparable form
* †Carbonocoryphe
** †Carbonocoryphe planucauda
* †Carboprimitia
** †Carboprimitia rotunda – or unidentified comparable form
* Life restoration of the Permian amphibian Cardiocephalus †Cardiocephalus
** †Cardiocephalus peabodyi – type locality for species
** †Cardiocephalus sternbergi – or unidentified comparable form
* †Cardiodella
** †Cardiodella abbreviatus
** †Cardiodella arcuatus
** †Cardiodella densus
** †Cardiodella robustus
* †Carolinites
** †Carolinites sibiricus
* †Caryocaris – tentative report
* †Caryocrinites
* †Cavellina
** †Cavellina lata
** †Cavellina subovata
* †Cavernula
** †Cavernula coccidia
** †Cavernula pediculata
* †Centrotarphyceras
** †Centrotarphyceras powersi
* †Ceramopora
** †Ceramopora unapensis
* †Ceramoporella
** †Ceramoporella ingenua
* †Ceratiocaris
* †Ceratocephala
** †Ceratocephala graffhami
* †Ceratonurus
* †Ceratopea
* †Ceraurinella
* Fossil of the Middle-Late Ordovician trilobite Ceraurus †Ceraurus
** †Ceraurus ruidus
* †Cerithioides – tentative report
** †Cerithioides gleanensis
* †Chaenocardia
** †Chaenocardia ovata
* †Chaetetes
** †Chaetetes milleporaceus – or unidentified comparable form
* †Chaloneria
* †Champlainopora
** †Champlainopora chazyensis
* †Chapmania
** †Chapmania carterensis
** †Chapmania oklahomensis
** †Chapmania taylori
* †Chaulistomella
** †Chaulistomella crassa
** †Chaulistomella magna
** †Chaulistomella mira
** †Chaulistomella mundula
** †Chaulistomella nitens
** †Chaulistomella obesa
* †Cheirocrinus
* †Cheirocystis
** †Cheirocystis ardmorensis
* Fossil of the Cambrian-Middle Devonian trilobite Cheirurus †Cheirurus
** †Cheirurus infensus
** †Cheirurus phollikodes – type locality for species
* †Chilotrypa
** †Chilotrypa distans – type locality for species
* †Chlidochirus
* †Choctawites
** †Choctawites choctawensis
* †Chonetes
** †Chonetes decipiens
** †Chonetes euampygus
** †Chonetes kingi – type locality for species
** †Chonetes mesoloba
* †Chonetinella
** †Chonetinella flemingi – or unidentified comparable form
* †Cibecuia
** †Cibecuia gouldii
* †Cibolocrinus
** †Cibolocrinus bellus – type locality for species
** †Cibolocrinus circulus – type locality for species
** †Cibolocrinus spinosus – type locality for species
** †Cibolocrinus tumidus
* †Cirratriradites
** †Cirratriradites annulatus
** †Cirratriradites annuliformis
** †Cirratriradites maculatus
** †Cirratriradites saturnii
* Fossil of the Carboniferous tabulate coral Cladochonus †Cladochonus
* †Claritacarpus – type locality for genus
** †Claritacarpus smithi – type locality for species
* †Clarkeolepis – type locality for genus
** †Clarkeolepis clarkei – type locality for species
** †Clarkeolepis elegans – type locality for species
* †Clathrocrinus
** †Clathrocrinus grileyi – type locality for species
* †Clavasporites – type locality for genus
** †Clavasporites irregularis – type locality for species
* †Clavatasporites
** †Clavatasporites irregularis
* †Cleiocrinus
** †Cleiocrinus bromidensis – type locality for species
** †Cleiocrinus regius
* Fossilized shell of the Middle Devonian-Permian brachiopod Cleiothyridina †Cleiothyridina
** †Cleiothyridina glenparkensis – or unidentified comparable form
** †Cleiothyridina orbicularis
* †Cleithronetrum
** †Cleithronetrum cancellatum
* †Cleithyridina
** †Cleithyridina orbicularis
* †Clepsydrops
* †Climacammina
* Cliona
** †Cliona fenestralis – type locality for species
** †Cliona paleodendrica – type locality for species
** †Cliona stellata – type locality for species
* †Clionolithes
** †Clionolithes radicans – or unidentified comparable form
* †Coelochilina
** †Coelochilina alata
* †Coelospira
** †Coelospira concava
** †Coelospira saffordi
** †Coelospira virginia
* †Colaptomena
** †Colaptomena bella
* †Coledium
** †Coledium simulans
* Illustration of a fossilized cranium of the Permian primitive reptile Colobomycter †Colobomycter – type locality for genus
** †Colobomycter pholeter – type locality for species
** †Colobomycter vaughni – type locality for species
* †Colpodecrinus
* †Complexisporites
** †Complexisporites polymorphus
* †Composita
** †Composita mexicana
** †Composita rotunda
** †Composita subcircularis
** †Composita subtilita
** †Composita wasatchensis
* Concavisporites
* †Concavissimisporites
* †Condracypris
** †Condracypris binoda
** †Condracypris coalensis – type locality for species
** †Condracypris parallela
** †Condracypris simplex
* †Condranema
** †Condranema magna – or unidentified comparable form
* †Conularia
** †Conularia crustula – or unidentified comparable form
* †Coolinia
** †Coolinia reedsi
* †Cordania
** †Cordania falcata
** †Cordania wessmani
* †Cordylodus
* †Cornigella
** †Cornigella pushmatahensis – type locality for species
* †Cornulites
** †Cornulites inelegans
* Cornuspira
** †Cornuspira semiconstrictus
* Mounted fossilized skeleton of the Permian synapsid (mammal precursor) Cotylorhynchus †Cotylorhynchus – type locality for genus
** †Cotylorhynchus bransoni – type locality for species
** †Cotylorhynchus romeri – type locality for species
* †Cranaena
** †Cranaena globosa
** †Cranaena salinensis – type locality for species
* Crania
** †Crania minuta – type locality for species
* †Craniops
** †Craniops tenuis
* †Crassispora
** †Crassispora kosankei
* †Cravenoceras
* †Cremacrinus
* †Cricotillus
** †Cricotillus brachydens
* Illustration of a fossilized skull and ventral scutes of the Carboniferous-Permian reptile relative Cricotus. Edward Drinker Cope (1884). †Cricotus
** †Cricotus crassidiscus
* †Crinerocrinus
* †Crinisarina
** †Crinisarina prouti
* †Crinoedischia
** †Crinoedischia noblensis – type locality for species
* †Cromyocrinus
** †Cromyocrinus grandis
* †Crossotelos – type locality for genus
** †Crossotelos annulatus – type locality for species
* †Crurithyris
** †Crurithyris planoconvexa
* †Cruruthyris
** †Cruruthyris planoconvexa
* †Crustaesporites
** †Crustaesporites globulus – tentative report
* †Cryptophyllus
** †Cryptophyllus gibbosum
** †Cryptophyllus nuculopsis
** †Cryptophyllus simpsoni
* †Cryptothyrella – tentative report
** †Cryptothyrella ovoides
* Fossil of the Carboniferous shark Ctenacanthus †Ctenacanthus – report made of unidentified related form or using admittedly obsolete nomenclature
* †Ctenobolbina
** †Ctenobolbina abrupta
** †Ctenobolbina bispinata
** †Ctenobolbina cancellata
** †Ctenobolbina inflata
** †Ctenobolbina parva
** †Ctenobolbina percarinata
** †Ctenobolbina varicata
* †Cullisonia
** †Cullisonia producta
* †Curtognathus
** †Curtognathus cordiformis
** †Curtognathus coronata
** †Curtognathus limitaris
* †Cyathocystis
** †Cyathocystis oklahomae
* †Cybeloides
* †Cybelopsis
* †Cycadopites
* †Cyclites
** †Cyclites depressus – type locality for species
* †Cyclobathmus
** †Cyclobathmus haworthi – type locality for species
* †Cycloceras
** †Cycloceras meeki – type locality for species
** †Cycloceras randolphensis
* †Cyclocystoides
* †Cyclogranisporites
** †Cyclogranisporites aureus
** †Cyclogranisporites leopoldi
** †Cyclogranisporites microgranus
** †Cyclogranisporites minutus
** †Cyclogranisporites obliquus
** †Cyclogranisporites orbicularis
* †Cyclonema
* †Cycloplectoceras
** †Cycloplectoceras miseri
* Fossilized foliage from the Carboniferous seed fern Cyclopteris †Cyclopteris
* †Cyclopuncta – type locality for genus
** †Cyclopuncta girtyi – type locality for species
* †Cyclospira
** †Cyclospira parva
* †Cyclozyga
** †Cyclozyga neotenica – type locality for species
* †Cymatorhiza – type locality for genus
** †Cymatorhiza kittsi – type locality for species
* †Cymatospira
** †Cymatospira montfortianus
* Fossil of the Late Ordovician-Late Devonian trilobite Cyphaspis †Cyphaspis
** †Cyphaspis carrolli
* †Cyphoneurodes
** †Cyphoneurodes patriciae – type locality for species
* †Cypricardella – tentative report
** †Cypricardella enigmatica – type locality for species
* †Cyrtina
** †Cyrtina dalmani
* †Cyrtograptus
* †Cyrtorizoceras
* †Cystiphyllum
* †Cystodictya
** †Cystodictya elegans – type locality for species

## D

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* D
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* M
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* Y
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* †Dactylogonia
** †Dactylogonia sculpturata
** †Dactylogonia subaequicostellata
* †Dalejina
** †Dalejina henryhousensis
** †Dalejina subtriangularis
* †Dalmanella
** †Dalmanella edgewoodensis
* Fossil of the Late Ordovician-Middle Devonian trilobite Dalmanites †Dalmanites
** †Dalmanites ptyktorhion
** †Dalmanites rutellum
* †Dapsilodus
** †Dapsilodus obliquicostatus
** †Dapsilodus praecipuus
** †Dapsilodus sparsus
* †Decoriconus
** †Decoriconus fragilis
* †Decoroproetus
** †Decoroproetus anaglyptus
** †Decoroproetus corycoeus
* †Dekayella
** †Dekayella praenuntia
* †Delocrinus
** †Delocrinus densus
** †Delocrinus hemisphericus
** †Delocrinus pentanodus – type locality for species
* †Deloia
** †Deloia sulcata
* †Delopsocus
** †Delopsocus elongatus
* †Delopterum
** †Delopterum latum
** †Delopterum minutum
* Interpretive diagrams and fossils of a skull of the Permian primitive reptile Delorhynchus †Delorhynchus – type locality for genus
** †Delorhynchus cifellii – type locality for species
** †Delorhynchus priscus – type locality for species
* †Delotaxis
* †Delthyris
** †Delthyris kozlowskii
* †Deltoidospora
** †Deltoidospora adnata
** †Deltoidospora grandis
** †Deltoidospora levis
** †Deltoidospora priddyi
** †Deltoidospora sphaerotriangula
** †Deltoidospora subadnatoides
* †Dendrocrinus
** †Dendrocrinus latibranchiatus – or unidentified comparable form
** †Dendrocrinus rusticus
* †Densosporites
** †Densosporites sphaerotriangularis
* †Derbyia
** †Derbyia crassa – or unidentified comparable form
* †Derbyoides – or unidentified related form
* †Desmoinesia
** †Desmoinesia muricatina
* †Desmorthis
* †Diabolocrinus
* †Diacalymene
** †Diacalymene clavicula
* Fossilized skeleton of the Permian reptile relative Diadectes †Diadectes
** †Diadectes zenos
* †Dianulites
** †Dianulites fastigiatus
** †Dianulites petropolitana
* †Diaphoroceras
* †Diaphorodendron
** †Diaphorodendron dicentricum
** †Diaphorodendron scleroticum
* †Diaphragmus
** †Diaphragmus fasciculatus
* †Dibunophyllum
** †Dibunophyllum hansoni – type locality for species
* †Dicamaropsis
** †Dicamaropsis parva
* †Dicellograptus
** †Dicellograptus gurleyi
** †Dicellograptus mensurans
* †Diceromyonia
** †Diceromyonia tersa – or unidentified comparable form
* †Dichentomum
** †Dichentomum tinctum
* †Dichognathus
** †Dichognathus extensa
** †Dichognathus typica
* †Dicoelosia
** †Dicoelosia oklahomenesis – type locality for species
** †Dicoelosia oklahomensis
** †Dicoelosia varica
* †Dicranella
** †Dicranella fragilis
** †Dicranella macrocarinata
* Dicranurus †Dicranurus
** †Dicranurus elegantus
** †Dicranurus hamatus
* †Dicromyocrinus
** †Dicromyocrinus medius – type locality for species
** †Dicromyocrinus optimus
** †Dicromyocrinus subaplatus – type locality for species
* †Dictybolos – type locality for genus
** †Dictybolos tener – type locality for species
* †Dictyoclostus
** †Dictyoclostus ingrata – or unidentified related form
** †Dictyoclostus mesialis
* †Dictyonema
** †Dictyonema francesiae
** †Dictyonema rockcrossingensis
* †Dictyospongia
* †Dielasma
** †Dielasma oklahomensis – type locality for species
* †Dierespongia – type locality for genus
** †Dierespongia palla – type locality for species
* †Dimeropygiella
* Life restoration of the Permian synapsid (mammal precursor) Dimetrodon †Dimetrodon
** †Dimetrodon dollovianus
** †Dimetrodon limbatus – or unidentified comparable form
** †Dimetrodon loomisi
** †Dimetrodon macrospondylus
* †Diphuicrinus
** †Diphuicrinus croneisi
** †Diphuicrinus dovelyensis
** †Diphuicrinus faustus – type locality for species
** †Diphuicrinus mammifer – type locality for species
** †Diphuicrinus pentanodus – type locality for species
* Fossilized axial skeleton of the Carboniferous-Permian amphibian Diplocaulus †Diplocaulus – type locality for genus
** †Diplocaulus magnicornis
** †Diplocaulus parvus – type locality for species
** †Diplocaulus primus – type locality for species
* †Diplograptus
** †Diplograptus maxwelli
* †Diplothmema
** †Diplothmema pachyderma
* †Diplotrypa
** †Diplotrypa bassleri
* †Discitoceras
* †Disparifusa
** †Disparifusa hystricosa
* †Distacodus
** †Distacodus oklahomensis – type locality for species
* †Ditaxineura
** †Ditaxineura cellulosa
* †Ditoecholasma
* †Ditomopyge
** †Ditomopyge parvulus – or unidentified comparable form
* †Dizygopleura
* †Doleotheca
* †Doleroides
** †Doleroides compressus
** †Doleroides oklahomensis
** †Doleroides vescus
* †Dolerophyllum – tentative report
* †Dolerorthis
** †Dolerorthis hami
** †Dolerorthis nanella
** †Dolerorthis savagei
* †Doleserpeton – type locality for genus
** †Doleserpeton annectens – type locality for species
* †Dolichoharpes
** †Dolichoharpes reticulata
* †Doliocrinus
* †Domatoceras
** †Domatoceras collinsvillense – type locality for species
** †Domatoceras williamsi
* †Donaldina
** †Donaldina attenuata
** †Donaldina grantonensis
* †Donezella
* †Donovaniconus
** †Donovaniconus oklahomensis – type locality for species
* †Drepanoistodus
** †Drepanoistodus suberectus
* †Dudleyaspis
* †Dunbarites
** †Dunbarites rectilateralis
** †Dunbarites wewokensis – type locality for species
* †Duncanella

## E

* A
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* M
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* Y
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* †Earlandinita
* †Eatonia
** †Eatonia exserta
* †Ecculiomphalus – tentative report
* †Echinaria
* †Echinoconchus
** †Echinoconchus elegans
* †Echinocrinus
** †Echinocrinus cratis – or unidentified related form
* †Echinoencrinites – tentative report
** †Echinoencrinites ornatus
* †Echinoprimitia
** †Echinoprimitia imputata
* Fossil of the Early-Middle Ordovician cystoid echinoderm Echinosphaerites †Echinosphaerites
** †Echinosphaerites aurantium
* †Economolopsis
** †Economolopsis anodontoides
* †Ectenaspis
** †Ectenaspis burkhalteri – type locality for species
* †Ectenocrinus
* †Ectenoglossa – tentative report
** †Ectenoglossa sculpta
* †Ectosteorhachis
** †Ectosteorhachis nitidus – or unidentified comparable form
* Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Edaphosaurus †Edaphosaurus
** †Edaphosaurus cruciger
* †Edestus – type locality for genus
** †Edestus vorax – type locality for species
* †Edmondia
** †Edmondia rotunda – type locality for species
** †Edmondia senilis – or unidentified comparable form
** †Edmondia splendens – type locality for species
* †Edriocrinus
* †Edriophus
* †Ehlersia
* †Elibatocrinus
** †Elibatocrinus elongatus – or unidentified comparable form
* †Elmoa
** †Elmoa trisecta
* †Elpidocrinus
** †Elpidocrinus tuberosus
* †Embolaster – type locality for genus
** †Embolaster graffhami – type locality for species
* †Emilites
** †Emilites bennisoni – type locality for species
* †Enchostoma – tentative report
** †Enchostoma bicarinatum – or unidentified comparable form
* †Endelocrinus
** †Endelocrinus matheri
* †Endosporites
** †Endosporites globiformis
** †Endosporites plicatus
** †Endosporites zonalis
* †Endothyra
** †Endothyra bowmani
* †Endothyranella
* †Enteletes
* †Entelophyllum
* †Enterolasma
* †Eoasianites
* †Eochiton
** †Eochiton arbucklensis – type locality for species
* †Eochonetes
** †Eochonetes magna
* †Eodictyonella (formerly Dictyonella)
** †Eodictyonella gibbosa
* †Eohippioceras
** †Eohippioceras ferratum
* †Eohollina
** †Eohollina depressa
** †Eohollina papillata
* †Eoleperditia
** †Eoleperditia fabulites
** †Eoleperditia inflativentralis
* †Eolissochonetes
* †Eomartiniopsis
** †Eomartiniopsis rostrata
* †Eomonorachus
** †Eomonorachus divaricatus
* †Eopinnacrinus
* †Eopleurophorus – type locality for genus
** †Eopleurophorus immaturus
** †Eopleurophorus spinulosa – or unidentified comparable form
* †Eoprimitia
** †Eoprimitia bailyana
** †Eoprimitia cooperi
** †Eoprimitia quadrata
** †Eoprimitia subnodosa
* †Eorobergia
** †Eorobergia marginalis – or unidentified comparable form
* †Eoschistoceras
** †Eoschistoceras strawnense
* †Eospirifer
** †Eospirifer acutolineatus
* †Eotomaria
* †Ephedripites
** †Ephedripites corrugatus – type locality for species
* †Epiphyton
* †Equisetites
* †Equisetosporites
* †Eridoconcha
** †Eridoconcha magna
** †Eridoconcha simpsoni
* †Eridopora
** †Eridopora radiata
** †Eridopora stellata
* †Eridotrypa
** †Eridotrypa abrupta
* †Erismodus – tentative report
* †Erisocrinus
** †Erisocrinus wapanucka
* Life restoration of the Carboniferous-Permian amphibian Eryops †Eryops
** †Eryops megacephalus
* †Escharopora
** †Escharopora recta
* †Estheria
* †Ethelocrinus – tentative report
** †Ethelocrinus kirki
* Fossilized holdfast of the Silurian-Middle Devonian crinoid ("sea lily") Eucalyptocrinites †Eucalyptocrinites
** †Eucalyptocrinites pernodosus
* †Euchondria
** †Euchondria subquadrata – type locality for species
* †Eucraterellina
** †Eucraterellina oblonga
** †Eucraterellina randolphi
** †Eucraterellina spitznasi
* †Eucystis
* †Eudissoceras – type locality for genus
** †Eudissoceras collinsvillense – type locality for species
* †Eukloedenella
* †Eumartynovia – type locality for genus
** †Eumartynovia raaschi – type locality for species
* †Eumetria
** †Eumetria deltoides – type locality for species
** †Eumetria matheri – type locality for species
** †Eumetria vera
** †Eumetria verneuiliana
* †Eumorphoceras
** †Eumorphoceras bisulcatum
** †Eumorphoceras girtyi
* †Eumorphocystis
** †Eumorphocystis multiporata
* †Euonychocrinus
* †Eupachycrinus
** †Eupachycrinus magister – or unidentified comparable form
** †Eupachycrinus verrucosus
* †Euphemites
** †Euphemites carbonarius
** †Euphemites compressus – type locality for species
* †Eurychilina
** †Eurychilina papillata
** †Eurychilina subradiata
** †Eurychilina ventrosa
* †Eurygonum
** †Eurygonum nodosum
* †Euryodus
** †Euryodus dalyae – type locality for species
** †Euryodus primus – or unidentified comparable form
* †Eusphenopteris
** †Eusphenopteris scribanii-striata – informal
* †Euspirocrinus
** †Euspirocrinus cirratus
* †Exocrinus
* †Exoriocrinus

## F

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* †Failleana
** †Failleana limbata – or unidentified comparable form
* †Falcisporites
** †Falcisporites zapfei
* †Fardenia
** †Fardenia attenuata
** †Fardenia reedsi
* †Fascichnus
** †Fascichnus dactylus
** †Fascichnus frutex
* †Fascifera
** †Fascifera dalmanelloidea
* †Fastigatisporites
** †Fastigatisporites physema – type locality for species
* †Favosites
* †Fayella – type locality for genus
** †Fayella chickashaensis – type locality for species
* Fossilized skull in multiple views of the Permian primitive reptile Feeserpeton †Feeserpeton – type locality for genus
** †Feeserpeton oklahomensis – type locality for species
* †Fenestella
** †Fenestella ardmorensis
** †Fenestella bendensis – type locality for species
** †Fenestella cestriensis
** †Fenestella chesterensis – or unidentified comparable form
** †Fenestella cumingsi
** †Fenestella exigua
** †Fenestella frutex – or unidentified comparable form
** †Fenestella granularis – type locality for species
** †Fenestella kosomensis – type locality for species
** †Fenestella morrowensis
** †Fenestella oklahomensis – type locality for species
** †Fenestella ovatipora – type locality for species
** †Fenestella paradisensis
** †Fenestella rara – type locality for species
** †Fenestella serratula
* †Fenesteverta – type locality for genus
** †Fenesteverta nicklesi – type locality for species
* †Fernglenia
** †Fernglenia vernonensis
* †Finkelnburgia
** †Finkelnburgia crassicostata
* †Fistulipora
* †Flexifenestella
** †Flexifenestella grandis – type locality for species
* †Florinites
** †Florinites mediapudens
** †Florinites millotti
** †Florinites similis
** †Florinites visendus
** †Florinites volans
* †Foerstediscus
* †Foerstia
** †Foerstia ohioensis
* †Fragiscutellum
** †Fragiscutellum glebalis
* †Fragiscutum
* Fossil in an enrolled posture of the Late Ordovician trilobite Frencrinuroides †Frencrinuroides
** †Frencrinuroides capitonis
* †Fusulina

## G

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* †Galateacrinus
* †Gardenasporites
** †Gardenasporites heisselii
* †Garwoodia
* †Gastrioceras
** †Gastrioceras adaense
** †Gastrioceras fittsi
** †Gastrioceras prone – type locality for species
** †Gastrioceras retiferum – type locality for species
* †Gazacrinus
** †Gazacrinus stellatus
* †Gelasinocephalus
** †Gelasinocephalus pustulosus
** †Gelasinocephalus whittingtoni
* †Geniculifera
** †Geniculifera siphuncula – type locality for species
* †Gigagramma – type locality for genus
** †Gigagramma carpenteri – type locality for species
* †Gigantopteris
** †Gigantopteris americana
* †Girtycoelia
* †Girtyella
* †Girtyspira
** †Girtyspira alvaensis – type locality for species
* †Girvanella
* †Gissocrinus
** †Gissocrinus quadratus
* †Glabovalvulina – tentative report
* †Glabrocingulum
** †Glabrocingulum grayvillense
** †Glabrocingulum stellaeformis
** †Glabrocingulum wannense – type locality for species
* †Glaphurochiton
* †Glaphyrites
** †Glaphyrites angulatus
** †Glaphyrites excelsus – type locality for species
** †Glaphyrites hyattianus
** †Glaphyrites subdiscus
** †Glaphyrites warei – type locality for species
* †Glaphyrophlebia
** †Glaphyrophlebia anderhalterorum – type locality for species
* †Glaukosocrinus
* †Globivalvulina
* †Globovalvulina
* †Globulocystites
** †Globulocystites cristatus
** †Globulocystites infundus
* †Glosella
** †Glosella liumbona
* †Gloverilima
** †Gloverilima pratti
* †Glymmatobolbina
** †Glymmatobolbina quadrata
* †Glyprorthis
** †Glyprorthis costellata
* †Glyptocystella
** †Glyptocystella loeblichae
* †Glyptocystites
** †Glyptocystites forbesi
** †Glyptocystites loeblichae
** †Glyptocystites logani
** †Glyptocystites multiporus
** †Glyptocystites regnelli – or unidentified comparable form
* †Glyptopleura
** †Glyptopleura geisi – type locality for species
** †Glyptopleura scotti – type locality for species
** †Glyptopleura warthini – type locality for species
* †Glyptorthis
** †Glyptorthis crenulata – type locality for species
** †Glyptorthis glaseri
** †Glyptorthis obesa – type locality for species
** †Glyptorthis uncinata – type locality for species
* †Gnathodus
* Life restoration of the Permian lungfish Gnathorhiza †Gnathorhiza
** †Gnathorhiza serrata
* †Gnetalesaccus
** †Gnetalesaccus variabilis
* †Gnorimocrinus
** †Gnorimocrinus pontotocensis
* †Goniasma
* Fossilized shell of the Late Devonian-Late Triassic ammonoid cephalopod Goniatites †Goniatites
** †Goniatites multiliratus – type locality for species
* †Gonioglyphioceras
** †Gonioglyphioceras gracile
* †Gonioloboceratoides
* †Goniophora
* †Gorgonisphaeridium
** †Gorgonisphaeridium antiquum
* †Gotlandochiton
** †Gotlandochiton hami – type locality for species
* †Graffhamicrinus
** †Graffhamicrinus antiquus
* †Grammolomatella
* †Granasporites
** †Granasporites medius
* †Grandfieldia – type locality for genus
** †Grandfieldia callilepidota – type locality for species
* †Granulatisporites
** †Granulatisporites granularis
** †Granulatisporites granulatus
** †Granulatisporites microgranifer
** †Granulatisporites minutus
** †Granulatisporites verrucosus
* †Graptodictya
** †Graptodictya elegantula
* †Griffithidella
** †Griffithidella alternata
** †Griffithidella doris
* †Gryphellina
** †Gryphellina sellardsi – type locality for species
* †Grypocrinus
* †Gyalorhethium
** †Gyalorhethium chondrodes
* Fossils of the Carboniferous coral Gymnophyllum, also known as button coral †Gymnophyllum
** †Gymnophyllum wardi
* †Gypidula
** †Gypidula multicostata
* †Gyronema

## H

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* †Hagnocrinus
* †Halliella
** †Halliella labiosa
* Fossil of the Ordovician bryozoan ("moss animal") Hallopora †Hallopora
** †Hallopora dubia
** †Hallopora macrostoma
** †Hallopora multitabulata
** †Hallopora pachymura
* †Halysites
* †Hamiapollenites – type locality for genus
** †Hamiapollenites karrooensis
** †Hamiapollenites saccatus – type locality for species
** †Hamiapollenites tractiferinus
* †Haplistion
** †Haplistion apletum – type locality for species
* †Hapsidopareion – type locality for genus
** †Hapsidopareion lepton – type locality for species
* †Harpidella
** †Harpidella butorus
* †Harpillaenus
* †Healdia
** †Healdia caneyensis
** †Healdia compressa
** †Healdia harltoni – type locality for species
** †Healdia simplicissima – type locality for species
* †Hebetorthoceras
** †Hebetorthoceras brokenarrowense
* †Heliolites
* †Heliosocrinus
** †Heliosocrinus neotosus – type locality for species
* †Helminthochiton
** †Helminthochiton riddlei
* †Hemiliroceras
** †Hemiliroceras reticulatum – type locality for species
* †Hemiphragma
** †Hemiphragma irrasum
** †Hemiphragma pulchra
* †Hesperocystis
** †Hesperocystis deckeri
* †Hesperorthis
** †Hesperorthis crinerensis
** †Hesperorthis rowlandi
** †Hesperorthis sulcata
* †Heterangium
* †Heteropecten
** †Heteropecten vanvleeti – type locality for species
* †Heterotrypa
** †Heterotrypa taffi
* †Hexacrinites
** †Hexacrinites adaensis
** †Hexacrinites carinatus
* †Hibbertia
* †Hindia
* †Hindiodella
* †Hippocrepina
** †Hippocrepina bendensis
* †Hiscobeccus
** †Hiscobeccus capax
* †Hoffmeisterites – type locality for genus
** †Hoffmeisterites microdens – type locality for species
* †Holcospermum
* †Hollinella
** †Hollinella burlingamensis
** †Hollinella radiata
* †Holmesella
** †Holmesella triangularis – type locality for species
** †Holmesella wapanuckensis – type locality for species
* Fossilized shells of the Ordovician-Carboniferous sea snail Holopea †Holopea – tentative report
* †Homocladus
** †Homocladus grandis
* †Homoeospira
** †Homoeospira costatula
** †Homoeospira foerstei
** †Homoeospira subgibbosa
* †Homotrypa
** †Homotrypa callitoecha
** †Homotrypa dickeyvillensis
** †Homotrypa multitabulata
** †Homotrypa sagittata
** †Homotrypa tuberculata
** †Homotrypa ulrichi
* †Hormotoma
* †Howellella
** †Howellella cycloptera
** †Howellella henryhousensis
** †Howellella splendens
* †Hudsonaster
* †Huntonella – type locality for genus
** †Huntonella unicornis – type locality for species
* Fossil of the Early Devonian trilobite Huntoniatonia †Huntoniatonia
** †Huntoniatonia huntonensis
** †Huntoniatonia lingulifer
** †Huntoniatonia oklahomae
** †Huntoniatonia purduei
* †Hustedia
** †Hustedia mormoni – or unidentified comparable form
* †Hybocrinus
** †Hybocrinus conicus
** †Hybocrinus crinerensis
** †Hybocrinus nitidus
** †Hybocrinus pyxidatus
* †Hydreionocrinus
** †Hydreionocrinus patulus
* Hyperammina
** †Hyperammina elongata
** †Hyperammina johnsvalleyensis – type locality for species
** †Hyperammina rugosa
* †Hyperamminoides
** †Hyperamminoides glabra
* †Hyperchilarina
** †Hyperchilarina nodosimarginata
* †Hypergonia
** †Hypergonia quadricarinata – or unidentified comparable form
** †Hypergonia tatei – or unidentified related form

## I

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ianthinopsis
* †Icthyocrinus
** †Icthyocrinus corbis
* †Idiognathodus
** †Idiognathodus delicates
** †Idiognathodus sinuatus
* Fossil of the Middle Ordovician trilobite Illaenus †Illaenus
** †Illaenus utahensis – or unidentified comparable form
* †Illenites
** †Illenites delasaucei
** †Illenites parvus
* †Inflatia
** †Inflatia cherokeensis
** †Inflatia clydensis
** †Inflatia cooperi
** †Inflatia gracilis
** †Inflatia inflata
** †Inflatia pusilla
** †Inflatia succincta – type locality for species
* †Ischyrotoma
** †Ischyrotoma sila
* †Isoallagecrinus
** †Isoallagecrinus barnettensis – type locality for species
* †Isochilina
** †Isochilina bulbosa
* †Isorthis
** †Isorthis arcuaria
** †Isorthis pygmaea
* †Isoteloides
** †Isoteloides peri
* Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus
** †Isotelus bradleyi – type locality for species
** †Isotelus violaensis – type locality for species
* †Ivanovia – tentative report
* †Ivoechiton
** †Ivoechiton calathicolus – type locality for species
** †Ivoechiton oklahomensis – type locality for species

## J

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Janusella
** †Janusella biceratina
* †Jeffersonia
** †Jeffersonia granosa
** †Jeffersonia jenni
** †Jeffersonia ulrichi
* †Jonesina
** †Jonesina spinigera – or unidentified comparable form
* †Jonesites
** †Jonesites circa
** †Jonesites huntonensis – type locality for species
* †Juresania

## K

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Fossils of the Early Devonian trilobite Kainops †Kainops
** †Kainops invius
** †Kainops raymondi
* †Kallimorphocrinus
** †Kallimorphocrinus eaglei – type locality for species
* †Kawina
* †Kayina
** †Kayina hybosa
** †Kayina porosa
* †Kennedya
** †Kennedya fraseri – type locality for species
** †Kennedya mirabilis
* †Keokukia
** †Keokukia sulcata
* †Kettneraspis
** †Kettneraspis williamsi
* †Kirkbya
** †Kirkbya bendensis – type locality for species
** †Kirkbya moorei
** †Kirkbya symmetrica
* †Kirkbyella
** †Kirkbyella obliqua
* †Kirkidium
* †Kirkocystis – type locality for genus
** †Kirkocystis papillata – type locality for species
* †Kitakamithyris
** †Kitakamithyris cooperensis
* †Klausipollenites
** †Klausipollenites aequus
** †Klausipollenites schaubergeri
* †Knightites
** †Knightites montfortianum
* †Knightoceras
** †Knightoceras patulum
* †Kockelella
** †Kockelella amsdeni
** †Kockelella crassa
** †Kockelella ortus
** †Kockelella patula
** †Kockelella ranuliformis
** †Kockelella stauros
** †Kockelella variabilis
** †Kockelella walliseri
* †Kosovopeltis
* †Kozlowskia
** †Kozlowskia splendens
* †Kozlowskiellina
** †Kozlowskiellina vaningeni
* †Krausella
** †Krausella arcuata
* †Krotovia
* †Kukalova – type locality for genus
** †Kukalova americana – type locality for species

## L

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Labidosaurikos – type locality for genus
** †Labidosaurikos meachami – type locality for species
* Life restoration of the Permian reptile Labidosaurus †Labidosaurus
* †Labiisporites
** †Labiisporites granulatus
* †Laeviatosporites
** †Laeviatosporites ovalis
* Laevidentalium
** †Laevidentalium venustum – or unidentified comparable form
* †Laevigatosporites
** †Laevigatosporites desmoinesensis
** †Laevigatosporites globosus
** †Laevigatosporites medius
** †Laevigatosporites ovalis
** †Laevigatosporites striatus
** †Laevigatosporites vulgaris
* †Lamellosathyris
** †Lamellosathyris lamellosa
* †Lampterocrinus
** †Lampterocrinus fatigatus
* †Lasanocrinus
** †Lasanocrinus daileyi
** †Lasanocrinus minutus – type locality for species
** †Lasanocrinus multinodulus – type locality for species
** †Lasanocrinus nodatus – type locality for species
** †Lasanocrinus nodus – type locality for species
** †Lasanocrinus strigosus
* †Latosporites
** †Latosporites minutus
* †Leangella
** †Leangella dissiticostella
* †Lecanocrinus
** †Lecanocrinus erectus
* †Lecythiocrinus
** †Lecythiocrinus asymmetricus – type locality for species
* †Leioclema
** †Leioclema dozierense
** †Leioclema pushmatahensis – type locality for species
* †Leiovalia
** †Leiovalia scaberula
** †Leiovalia teretis
* †Lemmatophora
** †Lemmatophora typa
* Fossil of the Late Ordovician-Middle Devonian trilobite Leonaspis †Leonaspis
** †Leonaspis williamsi
* †Lepadocystites
** †Lepadocystites moorei – tentative report
* †Leperditella
** †Leperditella aequilatera
** †Leperditella altiforma
** †Leperditella deckeri
** †Leperditella incisa
** †Leperditella jonesinoides
** †Leperditella minima
** †Leperditella porosa
** †Leperditella rex
** †Leperditella tumida
* †Leperditia
* †Lepidocoelus
* †Lepidocyclus
** †Lepidocyclus cooperi
** †Lepidocyclus manniensis – tentative report
** †Lepidocyclus oblongus
** †Lepidocyclus perlamellosus
* Life restoration of the Carboniferous tree-sized club moss relative Lepidodendron †Lepidodendron
** †Lepidodendron hickii
* †Lepidophloios
** †Lepidophloios hallii/johnsonii
* †Leptaena
** †Leptaena acuticuspidata – type locality for species
** †Leptaena oklahomensis – type locality for species
* †Leptaenisca
** †Leptaenisca concava
** †Leptaenisca irregularis
* †Leptagonia
** †Leptagonia analoga
* †Leptochirognathus
** †Leptochirognathus extensa
* †Leptodesma
** †Leptodesma gouldii – type locality for species
** †Leptodesma matheri – type locality for species
** †Leptodesma stenzeli – type locality for species
* †Leptoskelidion – tentative report
** †Leptoskelidion septulosum
* †Leptostrophia
** †Leptostrophia beckii
* †Levenea
** †Levenea subcarinata
* †Ligogramma – type locality for genus
** †Ligogramma sinuosa – type locality for species
** †Ligogramma wichita – type locality for species
* †Limipecten
** †Limipecten newelli – type locality for species
* †Lindosroemella
** †Lindosroemella patula – or unidentified comparable form
* †Lindostoemella
** †Lindostoemella patula – or unidentified comparable form
* †Lindostroemella
** †Lindostroemella patula – or unidentified comparable form
* Lingula
** †Lingula carbonaria – or unidentified comparable form
** †Lingula eva
** †Lingula paracletus – or unidentified comparable form
* †Lingulasma
** †Lingulasma oklahomense
* Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella †Lingulella
** †Lingulella galba
** †Lingulella glypta
* †Linoproductus
** †Linoproductus delawarii – type locality for species
** †Linoproductus ovatus
** †Linoproductus prattenianus
* †Liomolgocrinus
* †Liomopterella
** †Liomopterella pediaecetae – type locality for species
* †Liomopterum
** †Liomopterum ornatum
* †Liospira
* †Liroceras
** †Liroceras liratum
* †Lisca
** †Lisca minuta
* †Lissatrypa
** †Lissatrypa clairensis
** †Lissatrypa concentrica
** †Lissatrypa decaturensis
** †Lissatrypa henryhousensis
** †Lissatrypa parvula
* †Lissostrophia
** †Lissostrophia cooperi
** †Lissostrophia lindenensis
** †Lissostrophia lindensis
* Lithophaga
* Lituotuba
* Life restoration of the Permian amphibian Llistrofus †Llistrofus – type locality for genus
** †Llistrofus pricei – type locality for species
* †Lonchodomas
** †Lonchodomas mcgeheei
* †Lonchodus
* †Lophamplexus
** †Lophamplexus brevifolius – type locality for species
** †Lophamplexus lutarius – type locality for species
** †Lophamplexus spanius – type locality for species
** †Lophamplexus vagus – type locality for species
* †Lophophyllidium
** †Lophophyllidium asarcum – type locality for species
** †Lophophyllidium compressum – type locality for species
** †Lophophyllidium hadrum
** †Lophophyllidium profundum
** †Lophophyllidium wewokanum – type locality for species
* †Lophophyllum
* †Lophospira
* †Lophotichium
** †Lophotichium amoenum
* †Lophotriletes
** †Lophotriletes commissuralis
** †Lophotriletes ibrahimii
** †Lophotriletes microsaetosus
** †Lophotriletes pseudaculeatus
** †Lophotriletes rarispinosus
* †Lophpophyllum
** †Lophpophyllum profundum – or unidentified comparable form
* †Loxoedischia – type locality for genus
** †Loxoedischia drewi – type locality for species
* †Lueckisporites
** †Lueckisporites fimbriatus
** †Lueckisporites virkkiae
* †Lunaferamita
** †Lunaferamita bassleri
** †Lunaferamita virginiensis
* †Lundbladispora
* †Lunulasporites – type locality for genus
** †Lunulasporites vulgaris – type locality for species
* †Lutesvillia
** †Lutesvillia bispinosa
* †Lycospora
** †Lycospora granulata
** †Lycospora micropapillata
** †Lycospora pellucida
** †Lycospora pusilla
** †Lycospora rotuda
** †Lycospora rotunda
* †Lyroschizodus
** †Lyroschizodus oklahomensis – type locality for species
* Life restoration of the Permian snake-like amphibian Lysorophus showing speculative egg-coiling behavior †Lysorophus
** †Lysorophus tricarinatus

## M

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Maclurites
* Life restoration of the Permian primitive reptile Macroleter †Macroleter
** †Macroleter agilis – type locality for species
* †Macropotamorhynchus
** †Macropotamorhynchus tuta
* †Macrostylocrinus
** †Macrostylocrinus striatus
* †Mandalocystis – type locality for genus
** †Mandalocystis dockeryi – type locality for species
* †Manespira
** †Manespira costata
** †Manespira elongata
** †Manespira magnicostata
* †Marginatia
** †Marginatia magna
* †Marginifera
* †Marginovatia
** †Marginovatia manardensis
** †Marginovatia minor
** †Marginovatia pumila
* †Mariopteris
** †Mariopteris nervosa
** †Mariopteris occidentalis
* †Marsupiocrinus
** †Marsupiocrinus stellatus
* †Marsupipollenites
** †Marsupipollenites striatus
* †Martynovia
** †Martynovia halli – type locality for species
** †Martynovia longipennis – type locality for species
* †Mastigograptus
* †Matonisporites
* †Maurotarion
** †Maurotarion axitiosum
* †Maximites
** †Maximites oklahomensis – type locality for species
* †Mcqueenoceras
* †Meekella
** †Meekella striatocostata
* †Meekopinna
* †Meekopora
* †Meekospira
** †Meekospira choctawensis
** †Meekospira peracuta
* †Megactenopetalus
** †Megactenopetalus kaibabanus
* †Megaglossoceras
* †Megakozlowskiella
** †Megakozlowskiella velata
* †Megaliocrinus
** †Megaliocrinus aplatus
* †Megamyonia
** †Megamyonia mankini
* †Meganeuropsis
** †Meganeuropsis americana – type locality for species
* †Merista
** †Merista oklahomensis
* Illustration (lower right, entry 15) of a fossilized shell in front and side views of the Silurian-Late Devonian brachiopod Meristella †Meristella
** †Meristella atoka
* †Meristina
** †Meristina claritensis
** †Meristina roemeri
* †Mescalites
** †Mescalites discoidalis
* †Mesolobus
* †Mesotrypa
** †Mesotrypa angularis
** †Mesotrypa favosa
** †Mesotrypa tubulifera
* †Mesoxylon
* †Metachorus
** †Metachorus striolatus – type locality for species
* Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras †Metacoceras
** †Metacoceras cornutum
** †Metacoceras sinuosum
** †Metacoceras vagans – type locality for species
* †Metaconularia
* †Metacromyocrinus
** †Metacromyocrinus fundundus – type locality for species
** †Metacromyocrinus papulosus
* †Metutharocrinus
** †Metutharocrinus cockei
** †Metutharocrinus spinifer – type locality for species
** †Metutharocrinus undulatus – type locality for species
* †Michelinia
** †Michelinia meekana
* †Michelinoceras
** †Michelinoceras directum
** †Michelinoceras wapanuckense
* Life restoration of the Permian amphibian Micraroter †Micraroter – type locality for genus
** †Micraroter erythrogeios – type locality for species
* †Microcaracrinus
** †Microcaracrinus delicatus
* †Microcoelodus
** †Microcoelodus asymmetricus
** †Microcoelodus inornatus
** †Microcoelodus intermedius
** †Microcoelodus minutidentatus
** †Microcoelodus typus
* †Microleter – type locality for genus
** †Microleter mckinzieorum – type locality for species
* †Microreticulatisporites
** †Microreticulatisporites nobilis
** †Microreticulatisporites sulcatus
* †Microschmidtella
** †Microschmidtella berdanae – type locality for species
** †Microschmidtella hami – type locality for species
* †Microspermopteris
** †Microspermopteris aphyllum
* †Micula – tentative report
* †Midcopterum – type locality for genus
** †Midcopterum evidens – type locality for species
* †Mimella
** †Mimella extensa
** †Mimella subquadrata
* †Misthodotes
** †Misthodotes edmundsi – type locality for species
** †Misthodotes ovalis
* †Mitorthoceras
** †Mitorthoceras crebriliratum – type locality for species
** †Mitorthoceras perfilosum
* †Modiolopsis – tentative report
* Modiolus
* †Monoceratella
** †Monoceratella brevispinata
* †Monoceratina
** †Monoceratina ardmorensis
** †Monoceratina ventralis
* Fossils of the Early Devonian graptolite Monograptus †Monograptus
* †Monticuliporella
** †Monticuliporella croneisi
** †Monticuliporella peculiaris
** †Monticuliporella shideleri
* †Mooreina
** †Mooreina johnsvalleyensis – type locality for species
* †Mooreisporites
** †Mooreisporites inusitatus
* †Mooreoceras
* †Moorites
* †Moravia
** †Moravia grandis – type locality for species
* †Moundocrinus
** †Moundocrinus coalensis – type locality for species
* †Mucrosaccus
** †Mucrosaccus alatus – type locality for species
* †Multicostella
** †Multicostella convexa
** †Multicostella sulcata
* †Multidentodus – type locality for genus
** †Multidentodus brevis – type locality for species
** †Multidentodus gracilis – type locality for species
** †Multidentodus irregularis – type locality for species
** †Multidentodus johnsvalleyensis – type locality for species
** †Multidentodus typicus – type locality for species
** †Multidentodus wapanuckensis – type locality for species
* †Murinella
** †Murinella partita
* †Murospora
** †Murospora kosankei
* †Myalina
** †Myalina lepta
* Life restoration of the Permian synapsid (mammal precursor) Mycterosaurus †Mycterosaurus – type locality for genus
** †Mycterosaurus longiceps – type locality for species
* †Myeinocystites
** †Myeinocystites natus
* †Myelodactylus

## N

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Nanicrinus
** †Nanicrinus papillatus
* †Nannaroter – type locality for genus
** †Nannaroter mckinziei – type locality for species
* †Nannospondylus – type locality for genus
** †Nannospondylus stewarti – type locality for species
* †Naticonema
* Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis †Naticopsis
** †Naticopsis transversa – type locality for species
* †Navispira
** †Navispira saffordi
* †Neoarchaeocrinus
** †Neoarchaeocrinus necopinus
* †Neochonetes
** †Neochonetes granulifer
* †Neodimorphoceras
** †Neodimorphoceras oklahomae
* †Neoglyphioceras
** †Neoglyphioceras caneyanum – type locality for species
* †Neoisorophusella
** †Neoisorophusella whitesidei – type locality for species
* †Neokoninckophyllum
** †Neokoninckophyllum acolumnatum
** †Neokoninckophyllum tushanense
* †Neoraistrickia
* †Neospirifer
** †Neospirifer dunbari
* †Neostrophia
** †Neostrophia gregaria
* †Neothlipsura
** †Neothlipsura furca
* Fronds of the Carboniferous seed fern Neuropteris †Neuropteris
** †Neuropteris heterophylla
** †Neuropteris macrophylla
** †Neuropteris obliqua
** †Neuropteris osmundae
** †Neuropteris rarinervis
* †Nicholsonella
** †Nicholsonella acanthobscura
** †Nicholsonella irregularis
** †Nicholsonella laminata
** †Nicholsonella moniliformis
* †Nobloedischia – type locality for genus
** †Nobloedischia rasnitsyni – type locality for species
* †Nodosinella
** †Nodosinella glennensis – type locality for species
* †Nucleospira
** †Nucleospira concentrica
** †Nucleospira ventricosa
* Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula Nucula
* Nuculana
* †Nuculavus
* †Nuculopsis
** †Nuculopsis girtyi
** †Nuculopsis subventricosa
** †Nuculopsis wewoka
** †Nuculopsis wewokana
* †Nudauris
** †Nudauris reticulata
* †Nuferella
** †Nuferella rothi – type locality for species
* †Nummicrinus
** †Nummicrinus brevis
** †Nummicrinus papilloseous
* †Nummulostegina
** †Nummulostegina ardmorensis – type locality for species
* †Nuskoisporites
** †Nuskoisporites renulatus – type locality for species

## O

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Obturamentella – type locality for genus
** †Obturamentella wadei
* †Octonaria
* Fossil of the Silurian-Devonian trilobite Odontochile †Odontochile
** †Odontochile syncrama
** †Odontochile taffi
* †Odontopteris
** †Odontopteris permiensis – or unidentified comparable form
* †Oepikina
** †Oepikina expatiata
** †Oepikina extensa
** †Oepikina formosa
** †Oepikina gregaria
* †Oinochoe
** †Oinochoe coccymelum – type locality for species
* †Oistodus
** †Oistodus abundans
** †Oistodus inclinatus
* †Oklahomacrinus
** †Oklahomacrinus frostae
* †Oklahomacystis
** †Oklahomacystis spissus
** †Oklahomacystis tribrachiatus
* †Oklahomasporites – type locality for genus
** †Oklahomasporites majori – type locality for species
* †Oligophyllum – or unidentified comparable form
* †Oligotypus
** †Oligotypus tillyardi
* † Oliveria
* †Oltulocrinus
* †Omphalotrochus
** †Omphalotrochus wolfcampensis
* †Onniella – tentative report
* †Onychoplecia
** †Onychoplecia tenuis
* †Onychotreta
** †Onychotreta multiplicata
* Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon †Ophiacodon
** †Ophiacodon major
** †Ophiacodon mirus – or unidentified comparable form
** †Ophiacodon uniformis
* †Ophiletina
** †Ophiletina bromidensis – type locality for species
* †Opisthodontosaurus – type locality for genus
** †Opisthodontosaurus carrolli – type locality for species
* †Orbiculoidea
** †Orbiculoidea eximia
* †Orbignyella
** †Orbignyella sublamellosa
* †Orobias
** †Orobias ciscoensis
* †Oromycter – type locality for genus
** †Oromycter dolesorum – type locality for species
* †Orovenator – type locality for genus
** †Orovenator mayorum – type locality for species
* Life restoration of the Carboniferous-Permian freshwater shark Orthacanthus †Orthacanthus
** †Orthacanthus compressus
* †Orthoceras
* †Orthograptus
** †Orthograptus eucharis
* †Orthonema
* †Orthosphaeridium
** †Orthosphaeridium vibrissiferum
* †Orthostrophella
** †Orthostrophella clairensis
* †Orthostrophia
** †Orthostrophia brownsportensis – or unidentified comparable form
** †Orthostrophia strophomenoides
* †Orthotetes
** †Orthotetes kaskaskiensis
** †Orthotetes springerensis – type locality for species
* †Otarion
** †Otarion axitosum – type locality for species
* †Ottonosia
* †Oulodus
** †Oulodus siluricus
* †Ovatia
** †Ovatia laevicosta
* †Oxoplecia
** †Oxoplecia filosa
** †Oxoplecia gouldi
* †Oxyprora
** †Oxyprora oklahomaense
** †Oxyprora sayrei – type locality for species
* †Ozarkodina
** †Ozarkodina bohemica
** †Ozarkodina confluens
** †Ozarkodina crassa
** †Ozarkodina sagitta

## P

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Pachydictya
** †Pachydictya bromidensis
** †Pachydictya sheldonensis
* †Pachydomella
** †Pachydomella sohni – type locality for species
* †Pachyglossella
** †Pachyglossella biconvexa
* †Pachylyroceras
** †Pachylyroceras cloudi
* Fossil of the trilobite Paciphacops †Paciphacops
** †Paciphacops birdsongensis – or unidentified comparable form
** †Paciphacops campbelli
** †Paciphacops raymondi
* †Paladin
** †Paladin morrowensis
** †Paladin mucronatus – tentative report
* Palaeoaplysina – tentative report
* †Palaeocapulus – tentative report
** †Palaeocapulus acutirostre – or unidentified comparable form
* †Palaeocrinus
** †Palaeocrinus hudsoni
* †Palaeocystites – tentative report
* †Palaeolima
** †Palaeolima inequicostata
* †Palaeoneilo
* †Palaeostylus
* †Palaeotextularia
* †Palaeozygopleura
** †Palaeozygopleura parva – tentative report
* †Palecocrinus – tentative report
* †Paleochiton
** †Paleochiton kindbladensis – type locality for species
* †Paleohyperamum – type locality for genus
** †Paleohyperamum pottsvillensis – type locality for species
* †Paleotextularia
* †Paleuthygramma
** †Paleuthygramma acuta – type locality for species
* †Paleyoldia
** †Paleyoldia glabra
* †Palliseria
** †Palliseria robusta
* †Palmerocrinus
** †Palmerocrinus profundus – type locality for species
* †Paltodus
** †Paltodus compressus
* †Pandaspinapyga
** †Pandaspinapyga salsa
* †Panderodus
** †Panderodus equicostatus
** †Panderodus gracilis
** †Panderodus greenlandensis
** †Panderodus panderi
** †Panderodus unicostatus
* †Parabolbina
** †Parabolbina scotti
* †Paraconularia
* †Paracremacrinus
** †Paracremacrinus laticardinalis
* †Paracromyocrinus
** †Paracromyocrinus oklahomensis
** †Paracromyocrinus planatus – type locality for species
* †Paradiabolocrinus
* †Paraechmina
* †Paragassizocrinus
** †Paragassizocrinus tarri
* †Parahealdia
** †Parahealdia quaesita
* †Paralegoceras
** †Paralegoceras iowense
** †Paralegoceras textum
* †Parallelodon
** †Parallelodon vokesi – type locality for species
* †Paramelocrinus
** †Paramelocrinus ubaghsi
* †Paramphicrinus
* †Paraparchites
** †Paraparchites circulantis
** †Paraparchites elongatus – or unidentified comparable form
** †Paraparchites wapanuckensis
* †Parapermopsylla – type locality for genus
** †Parapermopsylla tricubita – type locality for species
* †Parapostibulla
** †Parapostibulla graysoni – type locality for species
* †Paraprisca
** †Paraprisca fragilis
* †Pararchaeocrinus
** †Pararchaeocrinus decoratus
* †Parasaccites
** †Parasaccites korbaenis
* †Paraschmidtella
* †Parastrophinella
** †Parastrophinella lepida
* †Parazophocrinus
** †Parazophocrinus callosus
* †Parelmoa – type locality for genus
** †Parelmoa obtusa – type locality for species
** †Parelmoa radialis – type locality for species
** †Parelmoa revelata – type locality for species
* †Parulrichia
** †Parulrichia haragenensis
* †Pasawioops – type locality for genus
** †Pasawioops mayi – type locality for species
* †Passalocrinus
* †Paucicrura
** †Paucicrura oklahomensis
** †Paucicrura rogata – or unidentified comparable form
* †Paurorthis
** †Paurorthis macrodeltoidea
* Fossils of the Late Devonian-Permian fern-like fronds Pecopteris †Pecopteris
** †Pecopteris cyathea
** †Pecopteris geinitzi
** †Pecopteris hemitelioides
** †Pecopteris miltonii
** †Pecopteris plumosa-dentata – informal
** †Pecopteris sarefolia
* †Pelidocrinus
** †Pelidocrinus exiguus
* †Peltabellia
** †Peltabellia implexa
* †Peltacrinus
** †Peltacrinus sculptatus
* †Penicillicrinus
* †Penniretepora
** †Penniretepora ardmorensis – type locality for species
* †Pennsylvanioxylon
* †Pentameroides
* Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites †Pentremites
* †Periglyptocrinus
** †Periglyptocrinus priscus
* †Perimestocrinus
** †Perimestocrinus teneris
* †Peripetoceras
* †Permoberotha
** †Permoberotha villosa – tentative report
* †Permoblattina
** †Permoblattina curta
* †Permocoleus – type locality for genus
** †Permocoleus wellingtonensis – type locality for species
* †Permopanorpa
** †Permopanorpa inaequalis
* †Permophorus
** †Permophorus albequus
** †Permophorus immaturis
** †Permophorus mexicanus
* †Permopsylla
** †Permopsylla americana – tentative report
* †Perrinites
** †Perrinites hilli
* †Perryella – type locality for genus
** †Perryella olsoni – type locality for species
* Fossilized tooth of the Carboniferous-Permian shark Petalodus †Petalodus
* †Petigurus
** †Petigurus cullisoni
* †Petraia – tentative report
* †Petraster
* †Petrocrania
** †Petrocrania inflata
* †Phacellopegma
** †Phacellopegma schizoderma
* †Phacelocrinus
** †Phacelocrinus brevis – type locality for species
** †Phacelocrinus rosei
* †Phanassymetria
** †Phanassymetria quadrupla
** †Phanassymetria triserrata
* †Phanelactis
* †Phaneroneura – type locality for genus
** †Phaneroneura martynovae – type locality for species
** †Phaneroneura reducta – type locality for species
* †Phanocrinus
** †Phanocrinus alexanderi – type locality for species
* †Pharkidonotus
** †Pharkidonotus percarinatus
* †Phenopterum
** †Phenopterum elongatum
* †Phestia
** †Phestia inflata
* †Philhedra
* †Phillipsia – tentative report
* †Phimocrinus
* †Pholidocidaris – tentative report
** †Pholidocidaris irregularis – or unidentified comparable form
* †Phragmodus
** †Phragmodus inflexus
** †Phragmodus undatus
* †Phragmolites
* †Phricodothyris
* †Phyloblatta
** †Phyloblatta curvata
* †Phymatopleura
** †Phymatopleura heteropleura – type locality for species
** †Phymatopleura nodosa
* †Pidelocrinus
** †Pidelocrinus planus
* †Pilosisporites
** †Pilosisporites aculeolatus
** †Pilosisporites williamsii
* Light micrograph of a Pinnularia alga †Pinnularia
* †Pirocystella
* †Pisocrinus
** †Pisocrinus quinquelobus
** †Pisocrinus spatulatus
** †Pisocrinus spatulus
** †Pisocrinus tennesseensis
* †Pityosporites
** †Pityosporites westphalensis
* †Placotriplesia
** †Placotriplesia praecipta
* Fossilized shell of the Ordovician brachiopod Plaesiomys †Plaesiomys
** †Plaesiomys bellistriatus
** †Plaesiomys proavitus
** †Plaesiomys subquadrata
* †Plagioglypta
** †Plagioglypta annulostriatum
* †Planisporites
* †Planobola
** †Planobola macrogota
* †Platyceras
** †Platyceras subelegans
* Three fossilized calyces of the Devonian-Permian crinoid ("sea lily") Platycrinites †Platycrinites
* †Platycystites
** †Platycystites bassleri
** †Platycystites bromidensis
** †Platycystites faberi
** †Platycystites fimbriatus
** †Platycystites infundus
** †Platycystites levatus
* †Platyfundocrinus
** †Platyfundocrinus webbersensis – type locality for species
* †Platymena – tentative report
** †Platymena bellatula
* †Platyrhomboides
** †Platyrhomboides quadratus
* †Platysaccus
** †Platysaccus papilionis
** †Platysaccus saarensis
* Life restoration of the Carboniferous-Permian bony fish Platysomus †Platysomus
** †Platysomus palmaris – or unidentified comparable form
* †Platystrophia
** †Platystrophia prima
** †Platystrophia sutherlandi
** †Platystrophia uncinata
* †Plectambonites
** †Plectambonites sericeus
* †Plectodonta
** †Plectodonta petila
* †Plectoglossa
** †Plectoglossa oklahomensis
* †Plectorthis
** †Plectorthis punctata
** †Plectorthis symmetrica
* †Pleuracanthus
** †Pleuracanthus gracilis
* Fossil of the Late Ordovician cystoid echinoderm Pleurocystites †Pleurocystites
** †Pleurocystites watkinsi
* †Plicochonetes
* †Pliomerops
** †Pliomerops canadensis – or unidentified comparable form
* †Pluchratia
* †Plummericrinus
** †Plummericrinus expansus – type locality for species
* †Poikilofusa
** †Poikilofusa plethysticha
* †Polidevcia
** †Polidevcia bellistriata
** †Polidevcia vaseyana – or unidentified comparable form
* †Poloniella
** †Poloniella chaleurensis – or unidentified comparable form
* †Polyancistrodorus
** †Polyancistrodorus columbariferus
* †Polycaulodus
** †Polycaulodus bidentatus
** †Polycaulodus tridentatus
* †Polycladiopora
** †Polycladiopora pinnata – or unidentified comparable form
* †Polydeltoideus
** †Polydeltoideus enodatus
* †Polygnathodella – type locality for genus
** †Polygnathodella ouachitensis – type locality for species
* †Polygnathoides
** †Polygnathoides siluricus
* †Polygnathus
** †Polygnathus wapanuckensis – type locality for species
* †Polylophothylax
** †Polylophothylax crossii
* †Polyplacognathus
** †Polyplacognathus sweeti
* †Polypora
** †Polypora debilis – type locality for species
** †Polypora ovicellata – type locality for species
* †Polytylites
** †Polytylites coryelli – type locality for species
** †Polytylites kellettae – type locality for species
** †Polytylites levinsoni – type locality for species
* †Porocrinus
** †Porocrinus bromidensis
* †Postibulla
** †Postibulla westergaardi – type locality for species
* †Poteriocrinus – tentative report
* †Potonieisporites
** †Potonieisporites simplex – type locality for species
* †Praecursoricrinus
** †Praecursoricrinus sulphurensis
* †Praepleurocystis
** †Praepleurocystis watkinsi
* †Prasopora
** †Prasopora fritzae
* †Primitiella
** †Primitiella varicata
* †Primitiopsis
** †Primitiopsis bassleri
** †Primitiopsis elegans
** †Primitiopsis excavatus
** †Primitiopsis minutus
* †Prioniodus
** †Prioniodus altodus – type locality for species
** †Prioniodus gerdae
* †Prismopora
* †Proallosocrinus
** †Proallosocrinus exemptus – type locality for species
** †Proallosocrinus glenisteri – type locality for species
* †Probnis
** †Probnis speciosa
* †Probolichas
* †Prodentalium
* †Productella
** †Productella recensis – type locality for species
* †Productus
** †Productus parvus
** †Productus stehlii – type locality for species
* Restoration of the Silurian trilobite Proetus †Proetus
** †Proetus foculus
* †Progoneura
** †Progoneura grimaldii – type locality for species
** †Progoneura nobilis – type locality for species
** †Progoneura venula – type locality for species
* †Prokopicrinus
** †Prokopicrinus laevis
** †Prokopicrinus tuberculatus
* †Promopalaeaster
* †Proshumardites
* †Protencrinus
** †Protencrinus atoka – type locality for species
* †Protereisma
** †Protereisma arcuatum – or unidentified comparable form
** †Protereisma latum
* †Prothalassoceras
** †Prothalassoceras inexpectans – type locality for species
* †Prothyris
** †Prothyris soleniformis – type locality for species
* †Protocaptorhinus
** †Protocaptorhinus pricei
* †Protohaploxypinus
** †Protohaploxypinus duivenii
** †Protohaploxypinus rugosus
** †Protohaploxypinus samoilovichii
** †Protohaploxypinus suchonensis – or unidentified comparable form
* †Protohymen
** †Protohymen anomalus – type locality for species
** †Protohymen bifurcatus – type locality for species
** †Protohymen curvatus – type locality for species
** †Protohymen largus – type locality for species
** †Protohymen latus – type locality for species
** †Protohymen pictus – type locality for species
** †Protohymen readi
** †Protohymen shafferi – type locality for species
** †Protohymen venustus – type locality for species
* †Protozyga
** †Protozyga loeblichi
* †Prouddenites
** †Prouddenites primus
* †Pseodorthoceras
* †Pseudelmoa – type locality for genus
** †Pseudelmoa ampla – type locality for species
* †Pseudoconocardium
* †Pseudocryptophyllum – or unidentified comparable form
* †Pseudodielasma
** †Pseudodielasma perplexa
* †Pseudoiasvia – type locality for genus
** †Pseudoiasvia sinuosa – type locality for species
* †Pseudolingula
** †Pseudolingula elegantula – or unidentified comparable form
** †Pseudolingula imperfecta
* †Pseudomera
** †Pseudomera barrandei
* †Pseudomonotis – tentative report
* †Pseudomulceodens
** †Pseudomulceodens cancellatus – or unidentified related form
* †Pseudoolenoides
** †Pseudoolenoides acicaudus
** †Pseudoolenoides carterensis – type locality for species
** †Pseudoolenoides derbyi – type locality for species
* †Pseudooneotodus
** †Pseudooneotodus bicornis
** †Pseudooneotodus linguicornis
* †Pseudoparalegoceras
** †Pseudoparalegoceras brazoense
* †Pseudopronorites
** †Pseudopronorites arkansasense
** †Pseudopronorites quinni
* †Pseudorthoceras
** †Pseudorthoceras knoxense
* †Pseudosyrinx
** †Pseudosyrinx missouriensis – or unidentified comparable form
* †Pseudothoceras
* †Pseudozygopleura
** †Pseudozygopleura multicostata – tentative report
** †Pseudozygopleura peoriense
** †Pseudozygopleura plebium – tentative report
** †Pseudozygopleura scitula
* †Psilokirkbyella
** †Psilokirkbyella magnopuncata
* †Psophosphaera
** †Psophosphaera greeri
* †Pteroconus – tentative report
** †Pteroconus abbreviatus
* †Pteronites
** †Pteronites angustatus – or unidentified comparable form
* †Pterotocrinus – tentative report
** †Pterotocrinus springerensis – type locality for species
* †Ptychocladia
** †Ptychocladia bassleri
* †Ptychopleurella
** †Ptychopleurella rugiplicata
* †Pudoproetus
** †Pudoproetus chappelensis
* †Pulchratia
* †Pulchrilamina
** †Pulchrilamina spinosa
* †Punctaparchites
** †Punctaparchites rugosus
* †Punctatisporites
** †Punctatisporites flavus
** †Punctatisporites glaber
** †Punctatisporites minutus
* †Punctatosporites
** †Punctatosporites minutus
* †Punctospirifer
** †Punctospirifer kentuckensis
** †Punctospirifer subtexta
** †Punctospirifer transversa
* †Punctothyris
** †Punctothyris kenwoodensis
* †Punka
** †Punka akoura
** †Punka verecunda
* †Pustula
** †Pustula kenwoodensis – type locality for species
** †Pustula oklahomae – type locality for species
* †Pycnopora
** †Pycnopora ovatipora – type locality for species
* †Pygmaeocrinus
* †Pyrgocystis

## Q

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Quadrocystis
** †Quadrocystis graffhami

## R

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Raaschia – type locality for genus
** †Raaschia oklahomensis – type locality for species
* †Rafinesquina
* †Raistrickia
** †Raistrickia abdita
** †Raistrickia aculeata
** †Raistrickia aculeolata
** †Raistrickia breveinens
** †Raistrickia crinita
** †Raistrickia crocea
* †Rakverella – tentative report
* †Ranapeltis
** †Ranapeltis rowlandi – type locality for species
* †Ranasasus
** †Ranasasus brevicephalus
** †Ranasasus colossus
** †Ranasasus conicus
* †Randaynia
** †Randaynia leatherburyi
* †Raphistoma
* †Rayella
** †Rayella calvini
** †Rayella parva
* †Raymondites
* †Rayonnoceras
** †Rayonnoceras vaughanianum – type locality for species
* †Rectifenestella
** †Rectifenestella tenax
* †Redstonia
** †Redstonia cooperi
* †Reedops
** †Reedops deckeri
* †Regulaecystis
* †Remopleurides
* †Renalcis
* †Renaultia
* †Rensselaerina
** †Rensselaerina haraganana
* Reophax
** †Reophax oacuhitensis – type locality for species
* †Resserella
** †Resserella brownsportensis
* †Reteocrinus
** †Reteocrinus depressus – type locality for species
* †Reticestus – tentative report
** †Reticestus retiferus
* †Reticulaiina
* †Reticulariina
* †Reticulatisporites
** †Reticulatisporites reticulatus
* †Reticulopteris
** †Reticulopteris muensteri
* †Retispira
** †Retispira meekiana
** †Retispira reticulata – type locality for species
* †Rhabdomeson
** †Rhabdomeson foerstei – type locality for species
** †Rhabdomeson rogersi – type locality for species
** †Rhabdomeson ulrichi – type locality for species
* †Rhipidomella
** †Rhipidomella acutisulcata – type locality for species
** †Rhipidomella diminutiva
** †Rhipidomella henryhousensis – type locality for species
** †Rhipidomella oklahomensis – type locality for species
** †Rhipidomella subtriangularis – type locality for species
* †Rhipidomelloides
** †Rhipidomelloides oblata
* †Rhiptosocherma
** †Rhiptosocherma improcera
* †Rhizomaspora – type locality for genus
** †Rhizomaspora divaricata – type locality for species
** †Rhizomaspora lemniscata – type locality for species
** †Rhizomaspora radiata – type locality for species
* †Rhizomospora
* †Rhizophyllum
* †Rhombocladia
* †Rhombopora
** †Rhombopora johnsvalleyensis – type locality for species
** †Rhombopora nitidula – type locality for species
* †Rhopalia
** †Rhopalia catenata
* Life restoration of the Permian amphibian Rhynchonkos †Rhynchonkos
** †Rhynchonkos stovalli – type locality for species
* †Rhynchopora
** †Rhynchopora kollari – type locality for species
** †Rhynchopora persinuata
* †Rhynchospirina
** †Rhynchospirina maxwelli – type locality for species
* †Rhynchotrema
** †Rhynchotrema increbescens – tentative report
* †Richardsonites
** †Richardsonites richardsonianus – type locality for species
* †Rishona
* Fossil of the barnacle boring ichnogenus Rogerella Rogerella
* †Rollia
** †Rollia goodwini
* Rostricellula
** †Rostricellula cuneata
* †Rothella
** †Rothella haraganensis – type locality for species
** †Rothella obliqua
** †Rothella recta
* †Rothianiscus
** †Rothianiscus robusta – type locality for species
* †Roundyella
** †Roundyella bellatula
* †Rowleyella
** †Rowleyella fabulites
* †Rugosochinetes
* †Rugosochonetes
** †Rugosochonetes multicostus

## S

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Saccocrinus
** †Saccocrinus benedicti
* †Saffordotaxis
* †Sagenodus
** †Sagenodus vinslovi
* †Sandia
* †Sanguinolites
** †Sanguinolites omalianus
** †Sanguinolites raleighensis
** †Sanguinolites simulans
* †Sansabella
** †Sansabella keslingi – type locality for species
** †Sansabella truncata – or unidentified comparable form
* †Sansabelloides
* †Sargentina
** †Sargentina allani – or unidentified comparable form
* †Saucrophyllum
* †Scaphiocrinus – tentative report
* †Schellwienella
** †Schellwienella marcidula
* †Schistoceras
** †Schistoceras unicum – type locality for species
* †Schizambon
** †Schizambon perspinosum
* †Schizodus
** †Schizodus chesterensis
** †Schizodus ovatus
** †Schizodus texanus
* †Schizonema
** †Schizonema hami
* †Schizophoria
** †Schizophoria mayesensis – type locality for species
* †Schmidtella
** †Schmidtella affinis
** †Schmidtella asymmetrica
** †Schmidtella brevis
** †Schmidtella crassimarginata
** †Schmidtella excavata
** †Schmidtella minuta
** †Schmidtella ovalis
** †Schmidtella transversa
* †Schopfipollenites
** †Schopfipollenites signatus – type locality for species
* †Schuchertella
** †Schuchertella attentuata
** †Schuchertella haraganensis
* †Sciadiocrinus
** †Sciadiocrinus cascus – type locality for species
** †Sciadiocrinus crassacanthus
** †Sciadiocrinus planulatus
* †Scolecia
** †Scolecia filosa
* †Scolecopteris
** †Scolecopteris altissima
** †Scolecopteris gnoma
* †scolerodont
* †Scolopodus
** †Scolopodus oklahomensis – type locality for species
** †Scolopodus striatum – type locality for species
* †Scutepustula
** †Scutepustula arctifossa
* †Scyphocrinites
* Fossilized calyx of the Carboniferous crinoid ("sea lily") Scytalocrinus †Scytalocrinus
** †Scytalocrinus crassibrachiatus – type locality for species
** †Scytalocrinus sansabensis
* †Sedgwickia
** †Sedgwickia rugosa – type locality for species
* †Seminolites
** †Seminolites kosomensis – type locality for species
** †Seminolites perforatus – type locality for species
** †Seminolites pushmatahensis – type locality for species
* †Seminolithes
** †Seminolithes clarkei – type locality for species
* †Senftenbergia
* †Septimyalina
** †Septimyalina burmai
* †Septopora
* Fossilized skeleton of the Permian primitive four-limbed animal Seymouria †Seymouria
** †Seymouria baylorensis
* †Shaleria – tentative report
* †Shansiella
** †Shansiella carbonaria – tentative report
* †Shumardoceras
* †Sibyrhynchus
* †Sieberella
** †Sieberella roemeri
* †Sievertsia
* Fossilized stump of the Carboniferous-Permian club moss relative Sigillaria †Sigillaria
* †Sigmophlebia – type locality for genus
** †Sigmophlebia engeli – type locality for species
* †Sillerpeton – type locality for genus
** †Sillerpeton permianum – type locality for species
* †Sinclairocystis
** †Sinclairocystis angulatus
** †Sinclairocystis praedicta
** †Sinclairocystis sulphurensis
* †Sinuitina
** †Sinuitina cordiformis – type locality for species
* †Sinuopea
** †Sinuopea basiplanata
** †Sinuopea vera
* †Siphonocrinus
** †Siphonocrinus dignus
* †Skenidioides
** †Skenidioides henryhousensis
** †Skenidioides oklahomensis
** †Skenidioides perfectus
* †Skenidium
** †Skenidium insigne
* Fossilized shells of the marine bivalve Solecurtus Solecurtus
** †Solecurtus gardneri – type locality for species
* Solemya – report made of unidentified related form or using admittedly obsolete nomenclature
* †Soleniscus
** †Soleniscus primigenia
** †Soleniscus regularis
* †Solenochilus
* †Solenomorpha – tentative report
** †Solenomorpha nitida – or unidentified comparable form
* †Somoholites
* †Sowerbyella
** †Sowerbyella indistincta
** †Sowerbyella plicatifera
** †Sowerbyella variabilis
** †Sowerbyella vulgata
* †Sowerbyites
** †Sowerbyites hami
** †Sowerbyites lamellosus
* †Spaniocrinus
* †Speyeris
** †Speyeris hami
* Fossil of the Middle Ordovician-Silurian trilobite Sphaerexochus †Sphaerexochus
** †Sphaerexochus glaber
* †Sphaerirhynchia
** †Sphaerirhynchia glomerosa – type locality for species
** †Sphaerirhynchia lindenensis
* †Sphaerocoryphe
* †Sphaerodoma
** †Sphaerodoma gracilis
* †Sphaerolepis
** †Sphaerolepis arctata
* Fossilized leaves and branches of the Devonian-Triassic horsetail relative Sphenophyllum †Sphenophyllum
** †Sphenophyllum emarginatum
** †Sphenophyllum gilmorei
** †Sphenophyllum latifolium – or unidentified comparable form
** †Sphenophyllum obovatum
** †Sphenophyllum stoukenbergi – tentative report
* †Sphenopteris
** †Sphenopteris macilenta
* †Spinobairdia
* †Spinocarinifera
** †Spinocarinifera semicostata
* †Spinosporites
** †Spinosporites exiguus
* Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer †Spirifer
** †Spirifer casteri – type locality for species
** †Spirifer grimesi
** †Spirifer opimus
* †Spiriferellina
* †Spirillina
** †Spirillina bendensis – type locality for species
* Spirorbis
** †Spirorbis elegans – type locality for species
* †Spongophylloides
* †Squamularia
* †Stacheia
** †Stacheia congesta
* †Staffella
* †Stegerhynchus
** †Stegerhynchus carmelensis
** †Stegerhynchus clairensis
** †Stegerhynchus concinna
* †Stegnopsis
** †Stegnopsis erythragora – type locality for species
** †Stegnopsis wellingensis – type locality for species
* †Stegocoelia
* †Stellarocrinus
** †Stellarocrinus cuneatus
* †Stenocladia – tentative report
** †Stenocladia bassleri
* †Stenopecrinus
** †Stenopecrinus ornatus – type locality for species
* †Stenopora
* †Stephanozyga
* †Steptognathodus
* †Stereobrachicrinus – type locality for genus
** †Stereobrachicrinus pustullosus – type locality for species
* †Stereostylus
** †Stereostylus perversus
* †Stictopora
** †Stictopora fenestrata
* †Strabocystis – type locality for genus
** †Strabocystis fayi – type locality for species
* †Straparollus
* †Straparolous
** †Straparolous catilloides
** †Straparolous catiloides
* †Streblochondria – tentative report
** †Streblochondria tenuilineata
* †Strebloplax – type locality for genus
** †Strebloplax crustacea – type locality for species
* †Streblotrypa
** †Streblotrypa nicklesi
* †Streptognathodus
* †Streptorhynchus
* †Striatites
** †Striatites richteri
* †Striatopodocarpites
** †Striatopodocarpites caricicostatus
** †Striatopodocarpites communis
** †Striatopodocarpites olsonii
* †Strigigenalis
** †Strigigenalis caudata
** †Strigigenalis crassimarginata
** †Strigigenalis derbyi
** †Strigigenalis implexa
** †Strigigenalis insentis
** †Strigigenalis knighti – or unidentified comparable form
* †Strimplecystis – type locality for genus
** †Strimplecystis oklahomensis – type locality for species
* †Strixella
** †Strixella acutisulcata
* †Strobeus
** †Strobeus brevis
** †Strobeus gouldiana – type locality for species
** †Strobeus intercalaris
** †Strobeus paludinaeformis
* †Stroboceras
** †Stroboceras furnishi – type locality for species
* †Stromatotrypa
** †Stromatotrypa frondosa
* †Strongylocrinus
** †Strongylocrinus hansoni – type locality for species
** †Strongylocrinus ornatus – type locality for species
* †Strophochonetes
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
** †Strophomena clermontensis
** †Strophomena costellata
** †Strophomena crinerensis
** †Strophomena neglecta
** †Strophomena oklahomensis
** †Strophomena perconcava – or unidentified comparable form
** †Strophomena planumbona
** †Strophomena trentonensis
* †Strophonella
** †Strophonella alterniradiata
** †Strophonella bransoni – type locality for species
** †Strophonella laxiplicata
** †Strophonella loeblichi
** †Strophonella prolongata
* †Strophostylus
* †Strotersporites – type locality for genus
** †Strotersporites communis – type locality for species
* †Stylocrinus
* †Sulcatisporites
** †Sulcatisporites potoniei
* †Sylvohymen
** †Sylvohymen ingens – type locality for species
* †Synchirocrinus
** †Synchirocrinus divisus
** †Synchirocrinus quadratus
* †Synerocrinus
** †Synerocrinus farishi
* †Syngastrioceras
** †Syngastrioceras clinei – type locality for species
** †Syngastrioceras scotti
* †Syringaxon

## T

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Tabulipora
** †Tabulipora macnairi – type locality for species
** †Tabulipora simplex – type locality for species
** †Tabulipora tuberculata – or unidentified comparable form
* †Taeniaesporites
** †Taeniaesporites noviaulensis – or unidentified comparable form
* †Taeniopteris
** †Taeniopteris abnormis
** †Taeniopteris multinervis
* †Tainoceras
** †Tainoceras murrayi
* †Tanaocystis
** †Tanaocystis watkinsi
* †Tarphyceras
** †Tarphyceras chadwickense
* †Teguliferina
** †Teguliferina parva – type locality for species
* †Tegulocrea
** †Tegulocrea incerta
* †Teiichispira
** †Teiichispira affinis – or unidentified comparable form
* †Tellinomorpha
** †Tellinomorpha schencki – type locality for species
* Fossilized shell of the Early Ordovician-Late Devonian probable mollusc Tentaculites †Tentaculites
* †Terpnocrinus
* †Tersomius
** †Tersomius dolesensis – type locality for species
** †Tersomius mosesi – type locality for species
** †Tersomius texensis – or unidentified comparable form
* †Tetradellina
** †Tetradellina henningsmoeni
* †Tetrataxis
** †Tetrataxis decurrens – or unidentified comparable form
** †Tetrataxis lata
* Fossilized shell of the Carboniferous-modern foraminiferan Textularia Textularia
** †Textularia grahamensis – or unidentified comparable form
* †Thalamocrinus
** †Thalamocrinus elongatus
* †Thalattocanthus
** †Thalattocanthus consonus
* †Thaleops
** †Thaleops jaanussoni
* †Thallograptus
* †Thamniscus
** †Thamniscus erectus – type locality for species
* †Thigriffides
** †Thigriffides roundyi
* †Thlipsura
** †Thlipsura furca
* †Thlipsurella
** †Thlipsurella fossata
** †Thlipsurella muricurva
** †Thlipsurella murrayensis – type locality for species
** †Thlipsurella putea
* †Thlipsuroides
* †Thomasatia
** †Thomasatia auricula
* †Thomasatina
** †Thomasatina bromidensis
** †Thomasatina simplex
* †Thoracoceras
* †Thrausmosaurus – type locality for genus
** †Thrausmosaurus serratidens – type locality for species
* †Thuroholia
** †Thuroholia crinerensis
** †Thuroholia croneisi
** †Thuroholia overbrookensis
* †Thymnospora
** †Thymnospora pseudothiessenii – or unidentified comparable form
* †Thymospora
** †Thymospora pseudothiessenii
* †Tolypammina
* †Torispora
** †Torispora securis
* †Torynifer
* †Trematospira
** †Trematospira costata – or unidentified comparable form
** †Trematospira hippolyte – or unidentified comparable form
* †Trepospira
** †Trepospira depressa
* †Trigonirhynchia
** †Trigonirhynchia acutirostella
* Fossilized skull of the Permian amphibian Trimerorhachis †Trimerorhachis
** †Trimerorhachis insignis
* †Triquitrites
** †Triquitrites additus
** †Triquitrites bransonii
** †Triquitrites exiguus
** †Triquitrites sculptilis
** †Triquitrites spinosus
** †Triquitrites subspinosus
** †Triquitrites tribullatus
* †Tririctus – type locality for genus
** †Tririctus reticulatus – type locality for species
* †Tritonoceras
* †Trochonodella
** †Trochonodella obtusa
* †Trochosporites – type locality for genus
** †Trochosporites reniformis – type locality for species
* †Trucherognathus
** †Trucherognathus distorta
** †Trucherognathus irregularis
* †Tryplasma
* †Tuberculatosporites
** †Tuberculatosporites robustus
* †Tubulibairdia
** †Tubulibairdia simplex
* †Tupus
** †Tupus gracilis – type locality for species
* †Turgidacystis – type locality for genus
** †Turgidacystis graffhami – type locality for species
* †Turrilepas
** †Turrilepas whithersi – type locality for species

## U

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ulocrinus
* †Ulrichia
* †Ulrichidiscus
** †Ulrichidiscus forbesi – type locality for species
* †Unibothriocidaris
* Fossil of the Ordovician-Devonian sea star Urasterella †Urasterella
* †Utharocrinus
** †Utharocrinus pentanodus

## V

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Valcourea
** †Valcourea transversa
* Varanodon †Varanodon – type locality for genus
** †Varanodon agilis – type locality for species
* †Varanops
** †Varanops brevirostris – or unidentified comparable form
* †Veliberychia
* †Vermiporella – tentative report
* †Verrucosisporites
** †Verrucosisporites grandiverrucosus
** †Verrucosisporites microtuberosus
** †Verrucosisporites verrucosus – or unidentified comparable form
* †Veryhachium
** †Veryhachium bromidense
** †Veryhachium irroratum
* †Vesicaspora
** †Vesicaspora schemelii
** †Vesicaspora wilsonii
* †Vestispora
** †Vestispora fenestrata
** †Vestispora foveata
** †Vestispora pseudoreticulata
** †Vestispora wanlessii
* †Victoriacystis
** †Victoriacystis holmesorum – or unidentified related form
* †Villosacapsula
** †Villosacapsula entriche
* †Vinella
** †Vinella bilineata – type locality for species
* †Virginiata
** †Virginiata arkansana
* †Vittatina
** †Vittatina costabilis – type locality for species
** †Vittatina lata – type locality for species
** †Vittatina simplex
** †Vittatina verrucosa
* †Vogdesia
** †Vogdesia bromidensis
* †Voiseyella
** †Voiseyella novamexicana

## W

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Waagenella
** †Waagenella crassus – or unidentified comparable form
* Fossilized foliage of the Carboniferous-Permian conifer Walchia †Walchia
** †Walchia gracilis – or unidentified comparable form
** †Walchia imbricata – tentative report
* †Walliserodus
* †Watongia – type locality for genus
** †Watongia meieri – type locality for species
* †Wedekindellina
* †Wellerella
* †Wellergyi
** †Wellergyi brazerianum
* †Wellerites
** †Wellerites mohri
* †Wewokella
** †Wewokella solida
* †Wewokites
** †Wewokites venatus
* †Whitspakia
** †Whitspakia schucherti
* †Wichitoceras
** †Wichitoceras crassum
** †Wichitoceras decipiens
* †Wiedeyoceras
* †Wilkingia
** †Wilkingia rothi
* †Wilsonites
** †Wilsonites delicatus
** †Wilsonites vesicatus
* †Winchellatina
** †Winchellatina cornuta
** †Winchellatina longispina
* †Worthenia
** †Worthenia tabulata
* †Wurmiella
** †Wurmiella excavata
** †Wurmiella posthamata

## X

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Restoration of the Late Devonian–Triassic freshwater shark Xenacanthus †Xenacanthus

## Y

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Yochelsonospira
** †Yochelsonospira thomasi – type locality for species
* Yoldia
* †Youngiella
** †Youngiella wapanuckensis – type locality for species

## Z

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Zaphrentites
** †Zaphrentites arkansanus
* Life restoration of the Permian amphibian Zatrachys †Zatrachys
** †Zatrachys serratus
* †Zeilleria
* †Zelophyllum
* †Zenocrinus
** †Zenocrinus zeus – type locality for species
* †Zonalasporites
** †Zonalasporites punctaticus – type locality for species
** †Zonalasporites punctatus
* †Zophocrinus
** †Zophocrinus angulatus
* †Zosterosporites
** †Zosterosporites triangularis
* †Zygopleura
* †Zygopteris
** †Zygopteris illinoiensis