# List of the Paleozoic life of Ohio

This list of the Paleozoic life of Ohio contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Ohio and are between 538.8 and 252.17 million years of age.

## A

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* †Abylea – type locality for genus
** †Abylea minuta – type locality for species
* †Acacocrinus
** †Acacocrinus anebos
* †Acanthatia
* †Acanthoclema
** †Acanthoclema lineatum
** †Acanthoclema ohioensis
** †Acanthoclema sulcatum
* †Acanthonema
** †Acanthonema holopiforme
** †Acanthonema newberryi
* †Acanthopecten
** †Acanthopecten bellosum – type locality for species
** †Acanthopecten carboniferus
* †Acanthotriletes
** †Acanthotriletes aculeolatus
* †Achatella
* †Acidaspis
** †Acidaspis cincinnatiensis
* †Acleistoceras – tentative report
* †Acmaeoblatta – type locality for genus
** †Acmaeoblatta lanceolata – type locality for species
* †Acriora
** †Acriora petala
* †Acteonina
** †Acteonina hanseni – type locality for species
* †Actinodesma
** †Actinodesma erectum
* †Actinopteria
** †Actinopteria boydi
* †Acutichiton – type locality for genus
** †Acutichiton pyrmidalus – type locality for species
* †Adamanterpeton – type locality for genus
** †Adamanterpeton ohioensis – type locality for species
* †Aechmina
** †Aechmina richmondensis
* †Aethaspis
* †Agelacrinites
** †Agelacrinites southworthi – or unidentified comparable form
* †Agnesia
** †Agnesia prosseri
* †Alaionema
** †Alaionema crenulatum
* †Alaskozygopleura
** †Alaskozygopleura gracillium
* †Alatisporites
** †Alatisporites trialatus
* Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris †Alethopteris
* †Allocryptaspis
* †Alloiopteris
** †Alloiopteris erosa
* †Allonema
* †Allonychia
* †Allorisma
** †Allorisma costatum
* †Alveolites
** †Alveolites labechii
* †Ambedus – type locality for genus
** †Ambedus pusilus – type locality for species
* †Ambocoelia
** †Ambocoelia norwoodi
** †Ambocoelia umbonata
* †Ambonychia
** †Ambonychia alata
** †Ambonychia cultrata
** †Ambonychia richmondensis
** †Ambonychia suberecta
* †Ambozone
** †Ambozone peoriensis – or unidentified comparable form
* †Ametroblatta
** †Ametroblatta strigosa – type locality for species
* †Ameura
** †Ameura missouriensis
* †Ammonidium
** †Ammonidium hamatum
* †Amphilichas
* †Amphiscapha
** †Amphiscapha catilloides
** †Amphiscapha reedsi
* Ordovician-Permian bryozoan Amplexopora †Amplexopora
** †Amplexopora pustulosa
** †Amplexopora robusta
* †Anaptychus – tentative report
** †Anaptychus emersoni
* †Anartiocystis
** †Anartiocystis foerstei
* †Anaspyroceras
* †Ancienta
** †Ancienta ohioensis
* Fossil of the Carboniferous horsetail relative Annularia †Annularia
** †Annularia asteris
** †Annularia radiata
** †Annularia sphenophylloides
** †Annularia stellata
* †Anomalocrinus
* †Anomalodonta
** †Anomalodonta costata
* †Anomalotoechus
** †Anomalotoechus tuberatus
* †Anostylostroma
** †Anostylostroma columnare
** †Anostylostroma laxum
* †Anozyga – type locality for genus
** †Anozyga bulla – type locality for species
* †Anthracodromeus
** †Anthracodromeus longipes – type locality for species
* †Anthracopupa – type locality for genus
** †Anthracopupa ohioensis – type locality for species
* Restoration of the face of the Carboniferous reptiliomorph Anthracosaurus †Anthracosaurus
** †Anthracosaurus lancifer – type locality for species
* †Antiquaster
** †Antiquaster magrumi
* †Antiquatonia
** †Antiquatonia costata
** †Antiquatonia portlockianus
* †Aparchites
** †Aparchites minutissimus
** †Aparchites oblongus
* †Aphelakardia
** †Aphelakardia alternistriata
* †Aphlebia
* †Apiculatasporites
** †Apiculatasporites acueatus
** †Apiculatasporites latigranifer
** †Apiculatasporites saetiger
** †Apiculatasporites setulosus
* †Arabellites
* Life restoration of the Carboniferous synapsid (mammal precursor) Archaeothyris †Archaeothyris
* †Archegogryllus – type locality for genus
** †Archegogryllus priscus – type locality for species
* †Archinacella
** †Archinacella rugatina
* †Arcochiton – type locality for genus
** †Arcochiton raymondi – type locality for species
* Fossil of the Silurian trilobite Arctinurus †Arctinurus
* †Arjamannia
** †Arjamannia inexpectans
* †Armenoceras
* †Arthraria
** †Arthraria biclavata
* †Arthroacantha
** †Arthroacantha carpenteri
* †Arthropitys
* Arthropoma
** †Arthropoma shafferi
* †Arthrostylus
* †Artisia
* †Ascodictyon
** †Ascodictyon fusiforme
* †Asolanus
** †Asolanus camptotaenia
** †Asolanus sigillarioides
* †Aspidopora
** †Aspidopora newberryi
* †Astartella
** †Astartella clinata – type locality for species
** †Astartella concentrica
** †Astartella varica
** †Astartella vera
* †Asterotheca
* †Atactoblatta – type locality for genus
** †Atactoblatta anomala – type locality for species
* †Atactoechus
** †Atactoechus typicus – or unidentified comparable form
* †Atactopora
* †Atactoporella
* †Ateleocystites
* †Athyris
** †Athyris vittata
* †Atraktoprion
* †Atrypa
** Fossilized shell of the Silurian-Late Devonian brachiopod Atrypa reticularis †Atrypa reticularis
** †Atrypa reticularus – report made of unidentified related form or using admittedly obsolete nomenclature
* †Augustoceras
* †Aulacella
* †Aulacera
** †Aulacera nodulosa
* †Aulocystis
** †Aulocystis auloporoidea
** †Aulocystis auloporoides
** †Aulocystis flabellata
** †Aulocystis jacksoni
** †Aulocystis lucasensis
* †Aulopora
** †Aulopora microbuccinata
** †Aulopora serpens
* †Austinella
** †Austinella scovellei
* Mold fossil found near Wooster of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten †Aviculopecten
** †Aviculopecten appalachianus – type locality for species
** †Aviculopecten columbianus – type locality for species
** †Aviculopecten coxanus
** †Aviculopecten fasciculatus
** †Aviculopecten occidentalis
** †Aviculopecten princeps
** †Aviculopecten winchelli
* †Aviculopinna
** †Aviculopinna peracuta

## B

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* †Bactrites – tentative report
** †Bactrites arkonensis – or unidentified comparable form
* Bairdia
** †Bairdia devonica
* †Balbiniconcha
** †Balbiniconcha hebe
* †Baldwinonus
** †Baldwinonus dunkardensis
* †Barathrisphaeridium
** †Barathrisphaeridium chagrinense
** †Barathrisphaeridium pumilispinosum
* †Barbclabornia
** †Barbclabornia luedersensis
* †Barychilina
* †Batostoma
** †Batostoma varians
* †Batostomella
** †Batostomella gracilis
** †Batostomella striata
* †Baylea
** †Baylea giffordi – or unidentified comparable form
** †Baylea inclinata – type locality for species
* †Beatricea
** †Beatricea undulata
* Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon †Bellerophon
** †Bellerophon hyalina
** †Bellerophon jeffersonensis
** †Bellerophon newberryi
** †Bellerophon pelops
** †Bellerophon spergensis
** †Bellerophon stevensianus
** †Bellerophon stummi – type locality for species
** †Bellerophon whittleseyi – type locality for species
* †Belodella
* †Beloitoceras
** †Beloitoceras amoenum
* †Bembexia
** †Bembexia adjutor – type locality for species
** †Bembexia insolita
* Berenicea
* †Bethanyphyllum
** †Bethanyphyllum robustum
* †Bicarina
** †Bicarina petilitornata
* †Bickmorites
* †Bikocrinus
** †Bikocrinus baios
* †Billingsastraea
** †Billingsastraea longicarinata
* †Billingsastrea
** †Billingsastrea longicarinata
* †Blattinopsis
** †Blattinopsis americana – type locality for species
** †Blattinopsis anthracina – type locality for species
** †Blattinopsis latipennis – type locality for species
* †Bodmania
* †Bollia
** †Bollia persulcata
** †Bollia regularis
* †Botryllopora
** †Botryllopora socialis
* †Botryocrinus
** †Botryocrinus neimani
* †Bowmanites
** †Bowmanites incurvata
** †Bowmanites magna
* †Brachiospongia
* Life restoration of the Carboniferous amphibian Brachydectes †Brachydectes – type locality for genus
** †Brachydectes newberryi – type locality for species
* †Brockocystis
** †Brockocystis nodosaria
* †Broiliellus
** †Broiliellus hektotopos – type locality for species
* †Bucanella
* †Bucania
** †Bucania crassa
* †Bucanopsis
* †Buthotrephis
** †Buthotrephis gracilis
* †Byssonychia
** †Byssonychia grandis
** †Byssonychia radiata
* Bythocypris
** †Bythocypris cylindrica
** †Bythocypris punctatus
* †Bythopora
** †Bythopora delicatula
** †Bythopora striata

## C

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* Fossilized stems from the Carboniferous-Permian horsetail relative Calamites †Calamites
** †Calamites carinatus
** †Calamites cisti
** †Calamites citiifromis
** †Calamites sachsi
** †Calamites schützeiformis
** †Calamites suckowi
** †Calamites suckowii
** †Calamites undulatus
* †Calamospora
** †Calamospora breviradiata
** †Calamospora hartungiana
** †Calamospora straminea
* †Calamostachys
** †Calamostachys bisporangiata – type locality for species
** †Calamostachys germanica
** †Calamostachys interculata – type locality for species
** †Calamostachys longibracteata – type locality for species
** †Calamostachys minuta – type locality for species
** †Calamostachys recurvata – type locality for species
** †Calamostachys tuberculata
* †Calapoecia
* †Calceocrinus
** †Calceocrinus incertus
* †Callipleura
** †Callipleura nobilis – or unidentified comparable form
* A polished round of the permineralised Late Devonian-Carboniferous wood Callixylon †Callixylon
** †Callixylon clevelandensis
** †Callixylon newberryi
* †Calloporella
* †Calostylis – tentative report
** †Calostylis lindstroemi
* †Calvibembexia
** †Calvibembexia sulcomarginata
* †Camarotoechia
** †Camarotoechia semiplicata
* Restoration of the Middle Ordovician-Silurian nautiloid cephalopod Cameroceras feeding on an Aphetoceras, while a quartet of Cyclostomiceras swim by †Cameroceras
* †Cardiocarpon
* †Cardiomorpha
** †Cardiomorpha missouriensis
* †Carneyella
** †Carneyella foerstei
* †Caryocrinites
* †Catazone
** †Catazone eversolensis – type locality for species
* †Catazyga
** †Catazyga headi
* Fossil of the Ordovician-Silurian tabulate coral Catenipora †Catenipora
** †Catenipora favositomima
** †Catenipora favositomina
** †Catenipora gotlandica
* †Caulopteris
** †Caulopteris antiqua
** †Caulopteris peregrina
* †Cayugaea
** †Cayugaea intermittens
** †Cayugaea transitorius – tentative report
* †Centroceras
* †Centrorhynchus (= Sartenaerus)
* †Ceramoporella
** †Ceramoporella granulosa
** †Ceramoporella ohioensis
* †Ceratocephala
* †Ceratoikiscum
** †Ceratoikiscum bujugum
** †Ceratoikiscum spinosiarcuatum
* †Ceratoikiscump
** †Ceratoikiscump erittacanthinum
** †Ceratoikiscump lanistellare
* †Ceratopsis
** †Ceratopsis chambersi
** †Ceratopsis oculifera
* †Ceraurinus
** †Ceraurinus icarus
* †Ceraurus
* †Chaenomya
** †Chaenomya leavenworthensis
* †Chagrinia
* †Chagrinichnites
* †Charactoceras
* †Chasmatopora
* Fossil of the Late Ordovician trilobite Chasmops †Chasmops
* †Chaunograptus
* †Chiloporella
* †Chlidochirus
** †Chlidochirus springeri
* †Chondrites
* †Chonetes
** †Chonetes aurora – tentative report
** †Chonetes deflectus
** †Chonetes minutus
** †Chonetes mucronatus – tentative report
* †Chonetina
** †Chonetina choteauensis
* †Chonetinella
** †Chonetinella flemingi
** †Chonetinella verneuilana
** †Chonetinella verneuiliana
* †Cincinnaticrinus
* †Cincinnatidiscus
* Assemblage of fossilized shells found in southern Ohio of the Ordovician brachiopod Cincinnetina †Cincinnetina
** †Cincinnetina meeki
** †Cincinnetina multisecta
* †Cirratriradites
** †Cirratriradites annulatus
* †Cladochonus
* †Cladopora
** †Cladopora bifurcata
** †Cladopora crassa
** †Cladopora lucasensis
** †Cladopora minuitissima
** †Cladopora roemeri
* Fossil found in Ohio of the Late Devonian shark Cladoselache †Cladoselache
** †Cladoselache clarki
* †Clarkesvillia
* †Clathrodictyon
** †Clathrodictyon confertum
* †Clathrospira
* †Claudeonychia – type locality for genus
** †Claudeonychia babini – type locality for species
* †Cleionychia
* †Clemetaocrinus
** †Clemetaocrinus ohioensis
* †Clevelandodendron
** †Clevelandodendron ohioensis
* Assemblage of fossils of the Cambrian graptolite Climacograptus †Climacograptus
* †Clinopistha
** †Clinopistha radiata
* †Coelocaulus
** †Coelocaulus desiderata
** †Coelocaulus strebloceras – tentative report
* †Coeloclema
** †Coeloclema oweni
* †Coenites
* †Coleolus
** †Coleolus iowensis
* Life restoration of the Carboniferous tetrapodomorph Colosteus †Colosteus
** †Colosteus scutellatus – type locality for species
* †Columnaria
** †Columnaria calicina
* †Comasphaeridium
** †Comasphaeridium caesariatum
* †Composita
** †Composita subtilita
* †Compsocrinus
** †Compsocrinus harrisi
* †Conchidium
* †Conradidium
** †Conradidium firmamentum
* †Constellaria
* †Conularia
** †Conularia formosa
* †Convolutispora
** †Convolutispora mellita
* †Cordaianthus
* †Cordaites
** †Cordaites principalis – or unidentified comparable form
* †Cornellites
** †Cornellites flabellum
* Fossil of the Middle Ordovician-Carboniferous horn coral Cornulites †Cornulites
** †Cornulites flexuosus
* †Corocrinus
** †Corocrinus noduosus
* †Corynotrypa
** †Corynotrypa delicatula
** †Corynotrypa inflata
* †Corythoecia
** †Corythoecia dichoptera
* †Costatulites
** †Costatulites richmondensis
* †Cranaena
** †Cranaena romingeri
* Craniella
** †Craniella hamiltonae
* †Crassisphaeridium
** †Crassisphaeridium inusitatum
* †Crassispora
** †Crassispora kosankei
* †Crenistriella
** †Crenistriella rotalinea
* †Crenulazona
** †Crenulazona angulata
* †Crepipora
* †Crurithyris
** †Crurithyris planoconvexa
* †Cryptolithus
** †Cryptolithus tesselata
* †Ctenacanthus
** †Ctenacanthus compressus
* †Ctenerpeton
** †Ctenerpeton remex – type locality for species
* †Ctenobolbina
** †Ctenobolbina ciliata
** †Ctenobolbina duryi
** †Ctenobolbina hammeli
* †Ctenodonta
** †Ctenodonta madisonensis
** †Ctenodonta recurva
* †Ctenospondylus
** †Ctenospondylus ninevehensis
* †Cuffeyella
** †Cuffeyella arachnoidea
* †Cunctocrinus
** †Cunctocrinus fortunatus – type locality for species
* †Cuneamya
** †Cuneamya elliptica
** †Cuneamya miamiensis
** †Cuneamya scapha
* †Cupularostrum
** †Cupularostrum prolificum
* †Cupulocrinus
* †Cycloconcha
* †Cyclocystoides
* †Cyclogranisporites
** †Cyclogranisporites microgranus
** †Cyclogranisporites minutus
** †Cyclogranisporites obliquus
** †Cyclogranisporites orbicularis
* †Cyclonema
** †Cyclonema bilix
** †Cyclonema gyronemoides
** †Cyclonema humerosum
** †Cyclonema minuta
* Fossilized foliage from the Carboniferous seed fern Cyclopteris †Cyclopteris
** †Cyclopteris orbicularis
** †Cyclopteris trichomanoides
* †Cyclora
** †Cyclora depressa
** †Cyclora hoffmani
** †Cyclora parvula
** †Cyclora pulcella
* †Cyclozyga
** †Cyclozyga attenuata – type locality for species
** †Cyclozyga mirabilis
* †Cylindrocoelia
* †Cylindrophyllum
** †Cylindrophyllum delicatulum
** †Cylindrophyllum delicatum
** †Cylindrophyllum profundum
* †Cymatiosphaera
** †Cymatiosphaera acinosa
** †Cymatiosphaera adaiochorata
** †Cymatiosphaera brevicrista
** †Cymatiosphaera daioariochora
** †Cymatiosphaera labyrinthica
** †Cymatiosphaera parvicarina
** †Cymatiosphaera rhacoamba
** †Cymatiosphaera velicarina
* †Cymatonota
** †Cymatonota constricta
** †Cymatonota cylindrica
** †Cymatonota parallela
** †Cymatonota recta
** †Cymatonota semistriata
* †Cymatospira
** †Cymatospira alternodosa – type locality for species
** †Cymatospira montfortianus
* †Cyperites
* †Cyphotrypa
** †Cyphotrypa clarksvillensis
* †Cypricardinia
** †Cypricardinia indenta
* Cypridina
** †Cypridina herzeri
* †Cyrtentactinia
** †Cyrtentactinia cibdelosphaera
** †Cyrtentactinia primotica
* †Cyrtina
** †Cyrtina alpenensis
** †Cyrtina hamiltonensis
** †Cyrtina umbonata
* †Cyrtocerina
* †Cyrtodonta
** †Cyrtodonta halli
* †Cyrtodontula
* †Cyrtolites
** †Cyrtolites claysferryensis
** †Cyrtolites inornatum
** †Cyrtolites ornatus
** †Cyrtolites retrorsus
* †Cyrtospira
** †Cyrtospira directus
* Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer †Cyrtospirifer
* †Cystaster
* †Cystiphylloides
** †Cystiphylloides americanum
* †Cystodictya
** †Cystodictya hamiltonensis
** †Cystodictya incisurata
* Cythere
** †Cythere ohioensis
* Cytherella
** †Cytherella unioniformis

## D

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* †Dalmanella
* †Danaeites
** †Danaeites emersonii
* Fossilized calyx of the Carboniferous crinoid ("sea lily") Decadocrinus †Decadocrinus
** †Decadocrinus hughwingi
** †Decadocrinus stewartae
** †Decadocrinus wrightae
* †Deceptrix
** †Deceptrix albertina
* †Dechenella
** †Dechenella alpenensis
** †Dechenella lucasensis
* †Dekayella
* †Dekayia
* †Deltodus
* †Deltoidospora
** †Deltoidospora levis
** †Deltoidospora priddyi
* †Denayella
** †Denayella rotalia
* †Dendrocrinus
** †Dendrocrinus daytonensis
* †Derbyia
** †Derbyia crassa
* †Dermatostroma
** †Dermatostroma scabrum
* †Desmoinesia
** †Desmoinesia muricatina
* †Devonalosia
** †Devonalosia wrightorum
* †Devonochonetes
** †Devonochonetes coronatus
** †Devonochonetes fragilis
** †Devonochonetes scitulus
* †Devonorhineoderma
** †Devonorhineoderma hyphantes
* †Diaphorochroa
** †Diaphorochroa ganglia
* †Dicalamophyllum
* Life restoration of the Carboniferous amphibian Diceratosaurus †Diceratosaurus
** †Diceratosaurus brevirostris – type locality for species
* †Dicranopora
** †Dicranopora emacerata
* †Dictyoclostus
** †Dictyoclostus semireticulatus
* †Dictyonema
* †Dictyotomaria
** †Dictyotomaria capillaria
** †Dictyotomaria scitula – or unidentified comparable form
* †Diestoceras
** †Diestoceras eos
** †Diestoceras indianense
** †Diestoceras shideleri
* †Diexallophasis
** †Diexallophasis absona
** †Diexallophasis cuspidis
* †Dinichthys
** †Dinichthys herzeri
* †Dinophyllum
** †Dinophyllum semilunum
** †Dinophyllum stokesi
* †Dinorthis
** †Dinorthis carleyi
* †Diphyphyllum
* Life restoration of a swimming group of the Permian amphibian Diploceraspis †Diploceraspis
* †Diplograptus
** †Diplograptus recurrens
* Discina
* †Discotrypa
* †Dithyrocaris
** †Dithyrocaris neptuni – or unidentified comparable form
* †Ditomopyge
** †Ditomopyge decurtata
** †Ditomopyge scitula
* †Divietipellis
** †Divietipellis robusta
* Life restoration of the Silurian eurypterid ("sea scorpion") Dolichopterus †Dolichopterus
** †Dolichopterus asperatus
* †Donaldiella
* †Donaldina
** †Donaldina bellilineata – or unidentified comparable form
** †Donaldina pygmaea – tentative report
** †Donaldina robusta – type locality for species
** †Donaldina stevensana – type locality for species
* †Dorsennidium
** †Dorsennidium patulum
* †Doryblatta – type locality for genus
** †Doryblatta longipennis – type locality for species
* †Douvillina
** †Douvillina distans
* †Drepanella
** †Drepanella richardsoni
* †Drepanoistodus
* †Drymocrinus
** †Drymocrinus geniculatus
* †Dunbarella
** †Dunbarella knighti – or unidentified comparable form
** †Dunbarella striata
* Life restoration of the Late Devonian placoderm fish Dunkleosteus †Dunkleosteus
** †Dunkleosteus raveri – type locality for species
* †Dvorakia
* †Dystactocrinus
** †Dystactocrinus constrictus
* †Dystactospongia

## E

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* †Ecclimadictyon
* †Ecdyceras
** †Ecdyceras foerstei
* †Echinocaris
** †Echinocaris multinodosa
** †Echinocaris multispinosis
** †Echinocaris ohioensis – type locality for species
** †Echinocaris pulchra – type locality for species
** †Echinocaris punctata
** †Echinocaris sublevis
* †Echinocoelia
* †Echinoconchus
** †Echinoconchus punctatus
* †Echinolichas
** †Echinolichas lucasensis
* †Ecmelostoiba
** †Ecmelostoiba asymmetrica
** †Ecmelostoiba leptoderma
* †Economolopsis
** †Economolopsis anodontoides
* †Ectenocrinus
** †Ectenocrinus simplex
* †Ecthymabrachion
** †Ecthymabrachion camptos
* †Edmondia
** †Edmondia aspenwallensis
** †Edmondia aspinwallensis
** †Edmondia nebrascensis
** †Edmondia nodulifera – type locality for species
* †Edon
** †Edon oblonga
* †Elasmonema
** †Elasmonema bellatula
** †Elasmonema clarki
** †Elasmonema corrugata – type locality for species
** †Elasmonema imitator
** †Elasmonema lichas
* Fossil found near Sylvania of the Middle-Late Devonian trilobite Eldredgeops †Eldredgeops
** †Eldredgeops rana
* †Elegantilites – tentative report
* †Elektoriskos
** †Elektoriskos apodasmios
** †Elektoriskos arcetotricus
** †Elektoriskos lasios
* †Eliasopora
** †Eliasopora stellatum
* †Elita
* †Elpe
** †Elpe cincinnatiensis
** †Elpe irregularis
** †Elpe ulrichi
* †Elrodoceras
* †Emmonsia
** †Emmonsia arbuscula
** †Emmonsia radiciformis
* †Endelocrinus
** †Endelocrinus kieri – type locality for species
* Fossilized shells and restored appearances of the Middle-Late Ordovician nautiloid cephalopod Endoceras †Endoceras
* †Endosporites
** †Endosporites globiformis
** †Endosporites plicatus
** †Endosporites zonalis
* †Endothyra
** †Endothyra kennethi
* †Endothyranella
** †Endothyranella inflata
** †Endothyranella intermissa
** †Endothyranella minuta – or unidentified comparable form
** †Endothyranella nitida – or unidentified comparable form
** †Endothyranella stormi – or unidentified comparable form
* †Entactinia
** †Entactinia additiva
** †Entactinia cometes
** †Entactinia crustescens
** †Entactinia exilispina
** †Entactinia herculea
** †Entactinia micula
** †Entactinia monalloea
** †Entactinia pantosompha
** †Entactinia paula
** †Entactinia quantilla
** †Entactinia somphorhips
** †Entactinia spongites
** †Entactinia sychnacanthina
* †Entactinosphaera
** †Entactinosphaera diplostraca
** †Entactinosphaera dystactotata
** †Entactinosphaera echinata – tentative report
** †Entactinosphaera erebenna
** †Entactinosphaera esostrongyla
** †Entactinosphaera euthlasta
** †Entactinosphaera fredericki
** †Entactinosphaera hapala
** †Entactinosphaera hystricosa
** †Entactinosphaera inusitata
** †Entactinosphaera polyacanthina
** †Entactinosphaera riedeli
** †Entactinosphaera symphypora
** †Entactinosphaera tretactinia
** †Entactinosphaera variacanthina
* †Entactinosphaerap
** †Entactinosphaerap alimbola
* †Enteletes
** †Enteletes hemiplicata
* †Eochonetes
** †Eochonetes clarksvillensis
** †Eochonetes clarkvillensis
* †Eomarginifera
** †Eomarginifera longispinus
* †Eomyelodactylus
** †Eomyelodactylus rotundatus
* †Eomylodactylus
** †Eomylodactylus rotundatus
* †Eotrophina
* †Ephelopalla
** †Ephelopalla elongata
** †Ephelopalla talea
* Life restoration of the Silurian-Early Devonian eurypterid ("sea scorpion") Erettopterus †Erettopterus
** †Erettopterus saetiger
* †Eridoconcha
** †Eridoconcha rugosa
* †Eridorthis
* †Eridotrypa
* †Erisocrinus
** †Erisocrinus typus
* †Erpetosaurus
** †Erpetosaurus radiatus – type locality for species
* †Escharopora
* †Estiastra
** †Estiastra culcita
** †Estiastra dilatostella
** †Estiastra rugosa
* Fossilized holdfast found in Ohio of the Silurian-Middle Devonian crinoid ("sea lily") Eucalyptocrinites †Eucalyptocrinites
* †Euchondria
** †Euchondria neglecta
** †Euchondria ohioensis – type locality for species
** †Euchondria pellucida
* †Euconospira
** †Euconospira turbiniformis
* †Eunicites
* †Euomphalus
** †Euomphalus planodorsatus
** †Euomphalus similis
* †Euphemites
** †Euphemites carbonarius
** †Euphemites enodis – type locality for species
** †Euphemites multiliratus – type locality for species
** †Euphemites nodocarinatus
** †Euphemites subglobosus
** †Euphemites vittatus
* †Eurymya
* †Euryocrinus – tentative report
** †Euryocrinus laddii
* Life restoration of Silurian eurypterid ("sea scorpion") Eurypterus †Eurypterus
** †Eurypterus ornatus
* †Eusauropleura – type locality for genus
** †Eusauropleura digitata – type locality for species
* †Eutaxocrinus
** †Eutaxocrinus wideneri
* †Evenkiella
* †Exilisphaeridium
** †Exilisphaeridium simplex
* †Exochoderma
** †Exochoderma irregulare
** †Exochoderma ramibrachium

## F

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* †Faberia
** †Faberia anomala
* †Faberoceras
* †Favistella
* Fossil of the Late Ordovician-Permian tabulate coral Favosites †Favosites
** †Favosites dentistabulatus
** †Favosites discoideus
** †Favosites favosus
** †Favosites hamiltonae
** †Favosites hamiltoniae
** †Favosites hisingeri
** †Favosites turbinatus
* †Fayettoceras
* †Fenestella
** †Fenestella shumardi
* †Fenestrellina
** †Fenestrellina rockportensis
* †Fistulipora
** †Fistulipora vesiculata
* Front (left) and right side (right) views of an enrolled fossil of the Middle Ordovician-Silurian trilobite Flexicalymene †Flexicalymene
** †Flexicalymene meeki
* †Florinites
** †Florinites florini
** †Florinites mediapudens
** †Florinites milloti
** †Florinites similis
** †Florinites visendus
* †Foerstia
** †Foerstia ohioensis
* †Fusispira
* Assemblage of fossils of Silurian-Permian fusulinid foraminiferans †Fusulina
** †Fusulina secalica
0 Links

## G

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* †Gamizyga
** †Gamizyga corpulentissima
** †Gamizyga girtyi – type locality for species
** †Gamizyga morningstarae
* †Gerablattina
** †Gerablattina richmondiana – type locality for species
* †Gigantopteris – or unidentified comparable form
* Fossilized calyx and partial stem of the Devonian-Carboniferous crinoid ("sea lily") Gilbertsocrinus †Gilbertsocrinus
** †Gilbertsocrinus alpenensis
** †Gilbertsocrinus ohioensis
* †Gillespieisporites
** †Gillespieisporites venustus
* †Girtyspira
** †Girtyspira minuta
* †Glabrocingulum
** †Glabrocingulum beedei – type locality for species
** †Glabrocingulum grayvillense
** †Glabrocingulum stellaeformis
** †Glabrocingulum wannense – or unidentified comparable form
* †Globodoma
** †Globodoma nodosa
* †Globozyga
** †Globozyga reticulata
** †Globozyga subcorpulenta – type locality for species
* †Glossites
** †Glossites subtenuis
* †Glyptocardia
** †Glyptocardia speciosa
* Assemblage of fossils of the Middle Ordovician-Silurian crinoid ("sea lily") Glyptocrinus †Glyptocrinus
** †Glyptocrinus richardsoni
* †Glyptorthis
** †Glyptorthis daytonensis – type locality for species
** †Glyptorthis fausta – type locality for species
** †Glyptorthis insculpta
* †Gomphostrobus
* †Goniasma
** †Goniasma lasallense – or unidentified comparable form
* †Gonioloboceras
* †Gorbyoceras
* †Gorogonisphaeridium
** †Gorogonisphaeridium absitum
** †Gorogonisphaeridium elongatum
** †Gorogonisphaeridium evexispinosum
** †Gorogonisphaeridium ohioense
** †Gorogonisphaeridium plerispinosum
** †Gorogonisphaeridium separatum
* †Gosseletia
** †Gosseletia triquetra
* †Gosselettia
** †Gosselettia triquetra
* †Graciloceras
* †Grammysia
** †Grammysia arcuata
** †Grammysia bellatula
** †Grammysia bisulcata
** †Grammysia constricta
** †Grammysia nodocostata
** †Grammysia sylvanensis
* †Grammysioidea
* †Granasporites
** †Granasporites medius
* †Granulatisporites
** †Granulatisporites granulatus
** †Granulatisporites minutus
** †Granulatisporites parvus
** †Granulatisporites piroformis
* †Graptodictya
** †Graptodictya perelegans
* Multiple views of a fossil of the Ordovician horn coral Grewingkia †Grewingkia
** †Grewingkia rusticum
* †Guttatisphaeridium
** †Guttatisphaeridium pandum
* †Gypidula

## H

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* †Habrostroma
** †Habrostroma beachvillensis
** †Habrostroma larocquei
** †Habrostroma marpleae
* †Hallinetes
** †Hallinetes setigera
* Fossil of the Ordovician bryozoan ("moss animal") Hallopora †Hallopora
** †Hallopora bassleri
** †Hallopora flabellaris
** †Hallopora libana
** †Hallopora nicklesi
** †Hallopora subnodosa
* †Halysites
** †Halysites catenularis
** †Halysites catenularius
** †Halysites nitidus
* †Hamiltonella
** †Hamiltonella punctulifera
* †Haplentactinia
** †Haplentactinia arrhinia
** †Haplentactinia rhinophyusa
* †Hawletrochus
** †Hawletrochus macrostomus
* †Hebertella
** †Hebertella alveata
** †Hebertella occidentalis
** †Hebertella sinuata
** †Hebertella subjugata
* †Hebertocaris
** †Hebertocaris wideneri
* †Hederella
** †Hederella alpenensis
** †Hederella bilineata
** †Hederella cirrhosa
** †Hederella concinnoides
** †Hederella delicatula
** †Hederella filiformis
** †Hederella magna
** †Hederella parvirugosa
** †Hederella rectifurcata
** †Hederella reimanni
** †Hederella thedfordensis
** †Hederella vagans
* †Helcionopsis
* †Helicelasma
** †Helicelasma rusticum
* †Helicotoma
* †Heliolites
* Fossil of the Middle Devonian horn coral Heliophyllum †Heliophyllum
** †Heliophyllum bathycalyx
** †Heliophyllum halli
** †Heliophyllum microcarinatum
* †Helminthochiton
** †Helminthochiton simplex
* †Helminthozyga
** †Helminthozyga costellata – type locality for species
** †Helminthozyga undulata – type locality for species
* †Helopora
** †Helopora inexpectata
* †Hemicystites
* †Hemiphragma
* †Hemizyga
** †Hemizyga attenuata
** †Hemizyga elegans – or unidentified comparable form
** †Hemizyga illineata – or unidentified comparable form
* †Heracloceras – tentative report
** †Heracloceras inelegans – tentative report
* †Hercostrophia
** †Hercostrophia robusta
* †Heslerodus
** †Heslerodus divergens
* †Hessonia
** †Hessonia priscus
* †Heterocrinus
** †Heterocrinus exiguus
** †Heterocrinus exilis
** †Heterocrinus heterodactylus
** †Heterocrinus juvenis
** †Heterocrinus pentagonus
* †Heteronema – tentative report
* †Heterophrentis
** †Heterophrentis simplex
* †Heterorthina
** †Heterorthina fairmountensis
* †Heterotrypa
* Fossil of the Devonian colonial rugose coral Hexagonaria, also known as a Petoskey stone †Hexagonaria
** †Hexagonaria anna
** †Hexagonaria stewartae
** †Hexagonaria tabulata
** †Hexagonaria truncata
* †Hexameroceras
* †Hindella
* †Hindia
* †Hippocardia
** †Hippocardia herricki – type locality for species
** †Hippocardia hydei – type locality for species
** †Hippocardia monroica
** †Hippocardia ohioense
* †Hiscobeccus
** †Hiscobeccus capax
* †Hoareicardia
** †Hoareicardia cunea
* †Holoeciscus
** †Holoeciscus auceps
* Fossilized shells of the Ordovician-Carboniferous sea snail Holopea †Holopea
* †Holoptychus – or unidentified comparable form
* †Holtedahlina
** †Holtedahlina sulcata
* †Homotrypa
** †Homotrypa wortheni
* †Homotrypella
** †Homotrypella dubia
* †Hormotoma
** †Hormotoma centervillensis – type locality for species
* †Hormotomina
** †Hormotomina maia
* †Hudsonaster
** †Hudsonaster incomptus
* †Hustedia
** †Hustedia mormoni
* †Hyattidina
* Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha †Hyolithes
** †Hyolithes dubius
** †Hyolithes parviusculus
** †Hyolithes versaillensis
* †Hypergonia
** †Hypergonia jonathanensis – type locality for species
* †Hyperoblastus
** †Hyperoblastus reimanni
* †Hyphantozyga
** †Hyphantozyga cancellata – type locality for species
** †Hyphantozyga fusiforma – type locality for species
** †Hyphantozyga gracilis
** †Hyphantozyga grandis – type locality for species
** †Hyphantozyga knighti
** †Hyphantozyga perattenuata
** †Hyphantozyga pulchra
** †Hyphantozyga textilis – type locality for species
* †Hypselentoma
** †Hypselentoma inornata
* †Hystriculina
** †Hystriculina wabashensis

## I

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* †Ianthinopsis
** †Ianthinopsis melanoides – type locality for species
* †Ibanocrinus
** †Ibanocrinus petalos
* †Ichthyerpeton
** †Ichthyerpeton squamosum – type locality for species
* †Icriodus
** †Icriodus angustus
** †Icriodus arkonensis
** †Icriodus brevis
** †Icriodus eriensis
** †Icriodus excavatus
** †Icriodus expansus
** †Icriodus janeae
** †Icriodus lindensis
** †Icriodus obliquimarginatus
** †Icriodus ohioensis
** †Icriodus platyobliquimarginatus
** †Icriodus regularicrescens
* †Indospora
** †Indospora stewartii
* †Intrapora
** †Intrapora irregularis
* †Iocrinus
* †Ischyrodonta
** †Ischyrodonta truncata
** †Ischyrodonta unionoides
* †Isodectes
** †Isodectes obtusus – type locality for species
* †Isonema
** †Isonema depressum
* †Isorophus
** †Isorophus austini
** †Isorophus holbrooki
** †Isorophus warrenensis
* †Isorthoceras
** †Isorthoceras albersi
* Fossil of the Middle-Late Ordovician giant trilobite Isotelus. Isotelus is the state fossil of Ohio. †Isotelus
** †Isotelus maximus
** †Isotelus megistos

## J

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* †Jedria
** †Jedria ventrica
* †Jonesella
** †Jonesella crepidiformis
** †Jonesella pedigera
* †Jonesites
** †Jonesites inornatus
** †Jonesites marginatus
* †Jugiaster
** †Jugiaster speciosus
* †Juresania
** †Juresania ovalis

## K

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* †Kindleoceras
* Fossilized shells of the Middle Ordovician-Permian nautiloid cephalopod Kionoceras †Kionoceras
* †Kockelella
** †Kockelella ortus
** †Kockelella ranuliformis
** †Kockelella walliseri
* †Kophinocrinus – tentative report
** †Kophinocrinus magrumi – tentative report
* †Kyreocrinus
** †Kyreocrinus constellatus

## L

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* †Labechia
* †Laccoprimitia
** †Laccoprimitia centralis
* †Laevigatosporites
** †Laevigatosporites desmoinesensis
** †Laevigatosporites globosus
** †Laevigatosporites medius
** †Laevigatosporites minimus
** †Laevigatosporites minor
** †Laevigatosporites ovalis
** †Laevigatosporites subadnatoides
** †Laevigatosporites vulgaris
* †Lambeoceras
* †Lanthanaster
** †Lanthanaster cruciformis – type locality for species
* †Lasiograptus
* †Latericriodus
** †Latericriodus latericrescens
* †Latosporites
** †Latosporites minutus
* †Lechritrochoceras
* †Leioclema
** †Leioclema alpenense
** †Leioclema alpense
* †Leiorhynchus
** †Leiorhynchus kelloggi
** †Leiorhynchus laura
** †Leiorhynchus lucasi
* †Leiosphaeridia
* †Leiotriletes
** †Leiotriletes granoornatus
** †Leiotriletes levis
** †Leiotriletes microsaetosus
** †Leiotriletes pseudaculeatus
** †Leiotriletes subadnatoides
* †Lepadocystis
* †Leperditia
** †Leperditia glabra
* †Lepidocoleus
* †Lepidocyclus
** †Lepidocyclus perlamellosum
* †Lepidocystis
* External mold fossil found in Ohio of the Carboniferous tree-sized club moss relative Lepidodendron †Lepidodendron
** †Lepidodendron aculeatum
** †Lepidodendron andrewsi
** †Lepidodendron jaraczewskii – or unidentified comparable form
** †Lepidodendron scutatum
* †Lepidolites
* †Lepidophloios
** †Lepidophloios larcinus
** †Lepidophloios vaningeni
* †Lepidostrobophyllum
* †Leptaena
** †Leptaena gibbosa
** †Leptaena richmondensis
* †Leptobolus
** †Leptobolus insignis
* †Leptodesma
** †Leptodesma ausablensis
** †Leptodesma matheri – or unidentified comparable form
** †Leptodesma rhysema – type locality for species
* †Leptograptus
* †Leptophractus – type locality for genus
** †Leptophractus obsoletus – type locality for species
* †Leptopoterion
* †Leptoptygma
** †Leptoptygma newtonensis – type locality for species
* †Leptotrypa
* †Leptotrypella
** †Leptotrypella ohioensis
* †Lescuropteris
** †Lescuropteris moorii
* †Levizygopleura
** †Levizygopleura inornata
** †Levizygopleura williamsi
* †Lichenocrinus
** †Lichenocrinus tuberculata
* †Limipecten
** †Limipecten lamellus – type locality for species
* †Limoptera
** †Limoptera curvata
** †Limoptera macroptera
* Lingula
** †Lingula carbonaria
** †Lingula meeki
** †Lingula melie
* †Lingulichnus
* †Lingulops
* †Linoproductus
** †Linoproductus cora
** †Linoproductus prattenianus
* †Linopteris
** †Linopteris muensteri
** †Linopteris neuropteroides
* †Lioclemella
* †Liospira
** †Liospira affinis
** †Liospira depressum – type locality for species
* †Liroceras – tentative report
* †Lodanaria
** †Lodanaria quadricarinata – type locality for species
* †Logocrinus – tentative report
** †Logocrinus brandoni – tentative report
* †Longispina
** †Longispina lissohybus
* †Longstaffia – tentative report
** †Longstaffia centervillensis – type locality for species
* †Lopholasma
** †Lopholasma delawarensis
* †Lophonychia
** †Lophonychia cordata
* †Lophophyllidium
** †Lophophyllidium profundum
* †Lophospira
** †Lophospira milleri
** †Lophospira perangulata
* †Lophotriletes
** †Lophotriletes granoornatus
* Life restoration of the Carboniferous tetrapod Loxomma †Loxomma
** †Loxomma lintonensis – type locality for species
* †Loxonema
** †Loxonema pikensis
* †Loxoplocus
** †Loxoplocus gothlandicus – type locality for species
* †Lycospora
** †Lycospora granulata
** †Lycospora micropapillata
** †Lycospora orbicula
** †Lycospora pellucida
** †Lycospora pusilla
** †Lycospora subjuga
** †Lycospora torquifer
* †Lyopora
** †Lyopora goldfussi
* †Lyriopecten
** †Lyriopecten mitchelli
* †Lyrodesma
** †Lyrodesma major

## M

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* †Macrerpeton
** †Macrerpeton huxleyi – type locality for species
* †Macrochilina
** †Macrochilina humilis
* †Maelonoceras
* †Manitoulinoceras
** †Manitoulinoceras gyroforme
** †Manitoulinoceras williamsae
* Fossilized shell of the Devonian ammonoid cephalopod Manticoceras †Manticoceras
* †Manticrinus
** †Manticrinus exaitos
* †Marsupiocrinus
* †Maryonychia
** †Maryonychia concordensis
* †Mastigograptus
** †Mastigograptus strictus
* †Mazostachys
** †Mazostachys compacta – type locality for species
* †Mediospirifer
** †Mediospirifer audaculus
* †Meekopinna
** †Meekopinna americana
* †Meekospira
** †Meekospira peracuta
* †Megacanthopora
** †Megacanthopora fallacis – or unidentified comparable form
* †Megacystites
* Life restoration of the Carboniferous amphibian Megalocephalus †Megalocephalus – type locality for genus
** †Megalocephalus lineolatus – type locality for species
* †Megalograptus
* †Megastrophia
** †Megastrophia concava
* †Megistocrinus
** †Megistocrinus depressus
* †Melocrinus
** †Melocrinus clarkei
* †Meristospira
** †Meristospira michiganensis
* †Merocrinus
* †Mesocoelia
** †Mesocoelia obstipisutura
* †Mesopalaeaster
** †Mesopalaeaster finei
** †Mesopalaeaster wilberanus
* †Mesothyra
* †Mesotrypa
** †Mesotrypa orbiculata
* †Metaxys
** †Metaxys fossa – type locality for species
* †Miamoceras
* †Michelinoceras
* †Micrhystridium
** †Micrhystridium adductum
** †Micrhystridium complurispinosum
** †Micrhystridium erugatum
** †Micrhystridium flexibile
** †Micrhystridium inusitatum
** †Micrhystridium profusam
* †Microceras
* †Microdoma
** †Microdoma tricarinatus
* †Microptychis
** †Microptychis cerithiformis
** †Microptychis expetendus
** †Microptychis occabus – type locality for species
** †Microptychis turbineus
* †Microreticulatisporites
** †Microreticulatisporites harrisonii
** †Microreticulatisporites nobilis
** †Microreticulatisporites sulcatus
* †Milleratia
* †Mitrospermum
** †Mitrospermum vinculum
* †Mixoneura
* †Modiolodon
** †Modiolodon subovalis
* †Modiolopsis
** †Modiolopsis capax
** †Modiolopsis modiolaris
** †Modiolopsis versaillesensis
* Modiolus
** †Modiolus fountainensis
** †Modiolus radiatus – type locality for species
** †Modiolus waverliensis
* †Modiomorpha
** †Modiomorpha concentrica
** †Modiomorpha concentricum
** †Modiomorpha mytiloides
** †Modiomorpha subalata
** †Modiomorpha subalta
* †Molgophis – type locality for genus
** †Molgophis macrurus – type locality for species
* †Monotrypa
* †Monticulipora
* †Mourlonia
** †Mourlonia plena
** †Mourlonia textus
* Fossilized shell found in Paulding County of the Devonian brachiopod Mucrospirifer †Mucrospirifer
** †Mucrospirifer alpenensis
** †Mucrospirifer grabaui – or unidentified comparable form
** †Mucrospirifer mucronatus
** †Mucrospirifer prolificus
* †Multiplicisphaeridium
** †Multiplicisphaeridium anastomosis
** †Multiplicisphaeridium verrucarum
* †Muraticavea
** †Muraticavea enteichia
* †Murchisonia
** †Murchisonia anderdoniae
** †Murchisonia dublinensis – type locality for species
** †Murchisonia gracilicrista
** †Murchisonia intermedia – type locality for species
** †Murchisonia leda
** †Murchisonia minuta
** †Murchisonia sibleyensis
** †Murchisonia subcarinata
** †Murchisonia subulata
* †Myalina
** †Myalina pernaformis
* †Myelodactylus – or unidentified comparable form
* †Mytilarca
** †Mytilarca cordata

## 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
* †Naevisphaeridium
** †Naevisphaeridium plenilunium
* †Narthecoceras
** †Narthecoceras dunni – type locality for species
* Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis †Naticopsis
** †Naticopsis aequistriata – type locality for species
** †Naticopsis comperta
** †Naticopsis genevievensis
** †Naticopsis levis
** †Naticopsis ziczac – type locality for species
* †Navifusa
** †Navifusa drosera
* †Neilsonia
** †Neilsonia uninodocarinata
* †Neochonetes
** †Neochonetes granulifer
** †Neochonetes variolata
* †Neospirifer
** †Neospirifer cameratus
** †Neospirifer dunbari
* †Nephriticeras – tentative report
* †Nereidavus
** †Nereidavus varians
* †Neumatoceras
* Fronds of the Carboniferous seed fern Neuropteris †Neuropteris
** †Neuropteris heterophylla
** †Neuropteris ovata
** †Neuropteris scheuchzeri
* †Nicholsonella
** †Nicholsonella peculiaris
* †Nicollidina
** †Nicollidina remscheidensis
* †Nodonema
** †Nodonema granulatum
* †Nucleocrinus
** †Nucleocrinus elegans – or unidentified comparable form
* Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula Nucula
** †Nucula corbuliformis
* Nuculana
* †Nucularca
** †Nucularca cingulata
* †Nuculites
** †Nuculites faberi
** †Nuculites fabula
** †Nuculites oblongatus
** †Nuculites triqueter
* †Nuculopsis
** †Nuculopsis beyrichi
** †Nuculopsis elongata
** †Nuculopsis girtyi
** †Nuculopsis shumardana – or unidentified related form
* † Nyassa
** †Nyassa recta

## 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
* Life restoration of the Carboniferous amphibian Odonterpeton †Odonterpeton – type locality for genus
** †Odonterpeton triangulare – type locality for species
* †Odontopleura
* †Odontopteris
** †Odontopteris aequalis
** †Odontopteris brardii
* †Oehlertella
** †Oehlertella stoutella
* †Oestocephalus – type locality for genus
** †Oestocephalus amphiuminum – type locality for species
* †Ohiocrinus
** †Ohiocrinus laxus
** †Ohiocrinus oehanus
* †Olenoides
* †Onchus
* †Oncoceras
* †Onniella
* †Onychochilus
** †Onychochilus abruptum – type locality for species
* †Oomoceras
* Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon †Ophiacodon
** †Ophiacodon uniformis – or unidentified comparable form
* †Opisthoptera
* †Opsiocrinus
** †Opsiocrinus mariae
* †Orbiculoidea
** †Orbiculoidea capuliformis
** †Orbiculoidea herzeri
** †Orbiculoidea missouriensis
** †Orbiculoidea newberryi
* †Orthis – tentative report
* †Orthoceras
** †Orthoceras trusitum
** †Orthoceras type locality for species – informal
* †Orthodesma
** †Orthodesma canaliculatum
* †Orthonema
** †Orthonema salteri
** †Orthonema subtaeniatum
* †Orthonota
** †Orthonota undulata
* †Orthonybyoceras – tentative report
* †Orthonychia
** †Orthonychia chesterense – tentative report
** †Orthonychia herzeri
** †Orthonychia infabricatus – type locality for species
** †Orthonychia parva
** †Orthonychia sciotoensis – type locality for species
** †Orthonychia waverlyensis
* †Orthopleura
* †Orthorhynchula
** †Orthorhynchula linneyi
* †Ortonella
* †Oulodus
** †Oulodus equirectis
** †Oulodus equirectus
* †Oxyprora
** †Oxyprora missouriensis
* †Ozarkodina
** †Ozarkodina bohemica
** †Ozarkodina confluens
** †Ozarkodina remscheidenesis
** †Ozarkodina sagitta
** †Ozarkodina tillmani

## 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 bifurcata
* †Paiderocrinus
** †Paiderocrinus asketos
** †Paiderocrinus ochthos
* †Palacanthus
** †Palacanthus acutus
* †Palaeocapulus
** †Palaeocapulus equilateralis
** †Palaeocapulus morsei – type locality for species
* †Palaeoconcha
* †Palaeolima
** †Palaeolima retifera
** †Palaeolima triplistriata
* †Palaeoneilo
** †Palaeoneilo bedfordensis
** †Palaeoneilo bownockeri
** †Palaeoneilo constricta – or unidentified related form
** †Palaeoneilo oweni
* †Palaeonucula
** †Palaeonucula lunulata – type locality for species
** †Palaeonucula subrotundata
* †Palaeopalaemon
** †Palaeopalaemon elegans – type locality for species
* †Palaeophycus
* †Palaeoporites
* †Palaeoscenidium
** †Palaeoscenidium cladophorum
** †Palaeoscenidium quadriramosum
* †Palaeostachya
** †Palaeostachya aperta
** †Palaeostachya decacnema
** †Palaeostachya elongata
** †Palaeostachya ovalis
** †Palaeostachya trabeculata – type locality for species
* †Palaeostylus
** †Palaeostylus marvinwelleri
** †Palaeostylus minuta
** †Palaeostylus venustus
* †Palaeotrochus
** †Palaeotrochus kearnyi
* †Palaeozygopleura
** †Palaeozygopleura hamiltoniae
** †Palaeozygopleura joani
** †Palaeozygopleura laeviusculum
** †Palaeozygopleura parvula
** †Palaeozygopleura sibleyensis
* †Paleofavosites
** †Paleofavosites prolificus
* †paleoporites
* †Paleschara
* †Paliphyllum
** †Paliphyllum brassfieldense
** †Paliphyllum primarium
** †Paliphyllum regulare
* †Panderodus
** †Panderodus unicostatus
* †Paracyclas
** †Paracyclas lirata
** †Paracyclas proavia
* †Paracyrtolites
** †Paracyrtolites carinatus
* †Paragoniozona
** †Paragoniozona granulostriata – or unidentified comparable form
* †Parajuresania
** †Parajuresania nebrascensis
* †Paraliospira
** †Paraliospira rugata
* †Parallelocrinus
** †Parallelocrinus sturgeoni – type locality for species
* †Parallelodon
** †Parallelodon irvinensis
** †Parallelodon obsoletus
** †Parallelodon tenuistriatus
* Assemblage of the Early-Middle Devonian brachiopod Paraspirifer †Paraspirifer
** †Paraspirifer bownockeri
* †Parazyga
* †Parvohallopora
** †Parvohallopora onealli
** †Parvohallopora ramosa
* †Pasceolus
** †Pasceolus camdenensis
* †Patellilabia
* †Patelliocrinus – type locality for genus
** †Patelliocrinus planus – type locality for species
* †Pattersonia
* †Paupospira
** †Paupospira bowdeni
** †Paupospira trilineata – type locality for species
** †Paupospira tropidophora
* Fossils of the Late Devonian-Permian fern-like fronds Pecopteris †Pecopteris
** †Pecopteris arborescens
** †Pecopteris candolleana
** †Pecopteris cyathea
** †Pecopteris hemitelioides
** †Pecopteris lamuriana
** †Pecopteris miltonii
** †Pecopteris unita
* †Penniretepora
** †Penniretepora irregularis – or unidentified comparable form
* †Pennoceras
** †Pennoceras seamani
* †Pentamerus
* †Permophorus
** †Permophorus oblongus
** †Permophorus subcostatus
** †Permophorus tropidophorus
* †Pernopecten
** †Pernopecten ohioensis
** †Pernopecten prosseri
* †Peronopora
** †Peronopora decipiens
* †Petalodus
** Fossilized tooth found in Athens County of the Carboniferous-Permiand shark Petalodus †Petalodus ohioensis
* †Petigopora
** †Petigopora offfula
* †Petraster
* †Petrocrania
** †Petrocrania hamiltonensis
** †Petrocrania laelia
** †Petrocrania modesta
** †Petrocrania scabiosa
* †Petrozium
** †Petrozium pelagicum
* †Pharkidonotus
** †Pharkidonotus breyeri – type locality for species
** †Pharkidonotus labioreflexus – type locality for species
** †Pharkidonotus percarinatus
* †Phestia
** †Phestia inflata
** †Phestia pandoraeformis
* †Philhedra
** †Philhedra crenistriatula
* Life restoration of the Carboniferous-Permian amphibian Phlegethontia. †Phlegethontia – type locality for genus
** †Phlegethontia linearis – type locality for species
** †Phlegethontia longissima – type locality for species
* †Pholadella
** †Pholadella radiata
* †Pholadomorpha
** †Pholadomorpha pholadiformis
* †Pholidops
* †Pholidostrophia
** †Pholidostrophia geniculata
** †Pholidostrophia gracilis
** †Pholidostrophia nacrea
* †Phragmoceras
* †Phragmolites
** †Phragmolites elegans – type locality for species
* †Phragmosphaera
** †Phragmosphaera lyra
* †Phylloporina
* †Phyloblatta
** †Phyloblatta jeffersoniana – type locality for species
* †Phymatopleura
** †Phymatopleura brazoensis
** †Phymatopleura nodosa
* †Phyrgilocrinus
** †Phyrgilocrinus batheri
* †Phyrtosaster – type locality for genus
** †Phyrtosaster casteri – type locality for species
* †Physonemus
** †Physonemus striatus – or unidentified comparable form
* †Physotomya
* †Pianodesma
* Pinna
** †Pinna missouriensis
* †Pityosporites
** †Pityosporites westphalensis
* †Placopterina
** †Placopterina ohioensis – type locality for species
* Fossilized shell of the Ordovician brachiopod Plaesiomys †Plaesiomys
** †Plaesiomys subquadrata
* †Plagiascetus – type locality for genus
** †Plagiascetus lateralis – type locality for species
* †Plagioglypta
* †Planalveolitella
** †Planalveolitella parasitica
* †Planisporites
** †Planisporites granifer
* †Planoendothyra
** †Planoendothyra associata
** †Planoendothyra evoluta
** †Planoendothyra orbiculata
** †Planoendothyra ovata – or unidentified comparable form
** †Planoendothyra whitesidei – or unidentified comparable form
* Fossilized shell found near Wooster of the Silurian-Early Triassic sea snail Platyceras †Platyceras
** †Platyceras attenuatum
** †Platyceras bucculentum
** †Platyceras carinatum
** †Platyceras cymbium
** †Platyceras erectum
** †Platyceras lineatum
** †Platyceras nasutum
** †Platyceras rarispinum
** †Platyceras subglobosa – type locality for species
** †Platyceras thetis
* †Platycoryphe
* Fossilized skeleton of the Carboniferous amphibian Platyrhinops †Platyrhinops – type locality for genus
** †Platyrhinops lyelli – type locality for species
* †Platystrophia
** †Platystrophia actilirata
** †Platystrophia acutilirata
** †Platystrophia annieana
** †Platystrophia auburnensis
** †Platystrophia clarksvillensis
** †Platystrophia corryvillensis
** †Platystrophia crassa
** †Platystrophia cummingsi
** †Platystrophia cypha
** †Platystrophia elkhornensis
** †Platystrophia foerstei
** †Platystrophia hopensis
** †Platystrophia laticosta
** †Platystrophia moritura
** †Platystrophia morrowensis
** †Platystrophia nitida
** †Platystrophia pauciplicata
** †Platystrophia ponderosa
** †Platystrophia sublaticosta
** †Platystrophia wallowayi
* †Plectodina
* †Plectonotus
** †Plectonotus boucoti
* †Plectorthis
** †Plectorthis aequivalvis
** †Plectorthis fissicosta
** †Plectorthis jamesi
** †Plectorthis neglecta
** †Plectorthis plicatella
* †Plethospira
* Fossil of the Silurian-Carboniferous tabulate coral Pleurodictyum †Pleurodictyum
** †Pleurodictyum cornu
** †Pleurodictyum plana
* †Pleuronotus
** †Pleuronotus decewi
* †Pleuroptyx – type locality for genus
** †Pleuroptyx clavatus – type locality for species
* †Pleurorthoceras
** †Pleurorthoceras clarksvillense
* †Plexadictyon
* †Plocezyga
** †Plocezyga acuminata
** †Plocezyga conica
** †Plocezyga cordiformis
** †Plocezyga costata – type locality for species
** †Plocezyga delicata
** †Plocezyga excellens
** †Plocezyga intermedia
** †Plocezyga lineata
** †Plocezyga lirata
** †Plocezyga markae
** †Plocezyga ornata – type locality for species
** †Plocezyga ornatissima
** †Plocezyga percostata
** †Plocezyga perminuta
** †Plocezyga regularia
** †Plocezyga subnodosa
** †Plocezyga turbinata
* †Podolithus
* †Poleumita
** †Poleumita incarinatus
* †Polidevcia
** †Polidevcia bellistriata
** †Polidevcia stevensiana
* †Polyentactinia
** †Polyentactinia craticulata
** †Polyentactinia leptosphaera
** †Polyentactinia plecta
** †Polyentactinia polygonia
* Various conodont elements of Polygnathus †Polygnathus
** †Polygnathus eiflius
** †Polygnathus intermedius
** †Polygnathus linguiformis
** †Polygnathus pseudofoliatus
** †Polygnathus strongi
** †Polygnathus xylus
* †Polypora
** †Polypora valida – or unidentified comparable form
* Pontocypris
** †Pontocypris acuminata
* †Poroblattina
** †Poroblattina brachyptera – type locality for species
** †Poroblattina lata – type locality for species
** †Poroblattina ohioensis – type locality for species
** †Poroblattina richmondiana – type locality for species
** †Poroblattina rotundata – type locality for species
* †Posidonia
** †Posidonia girtyi
* †Praenucula
* †Primiriopsis
** †Primiriopsis punctulifera
* †Primitia
** †Primitia cincinnatiensis
** †Primitia rudis
* †Primitiella
** †Primitiella claypolei
** †Primitiella whitfieldi
* †Probillingsites
** †Probillingsites lebanonensis
* Proboscina
** †Proboscina auloporoides
** †Proboscina frondosa
* †Proctothylacocrinus
** †Proctothylacocrinus esseri
** †Proctothylacocrinus longus
* †Productus
** †Productus semireticulatua
* Restoration of the Silurian trilobite Proetus †Proetus
* †Promopalaeaster
** †Promopalaeaster granulosus
** †Promopalaeaster wykoffi
* †Promytilus
** †Promytilus pottsvillensis – type locality for species
* †Propora
** †Propora conferta
** †Propora eminula
* †Prosserella
** †Prosserella lucasi
** †Prosserella subtransversa
* †Protaraea
** †Protaraea richmondensis
* †Protarea
* †Protathyris – tentative report
* †Protobalanus
** †Protobalanus spinicoronatus – type locality for species
* †Protocycloceras
** †Protocycloceras rushense
* †Protokionoceras
* †Protoleptostrophia
** †Protoleptostrophia perplana
* †Protosalvinia
** †Protosalvinia arnoldii
** †Protosalvinia ravenna
* †Protoscolex
* Restoration based on the "Schunnemunk tree" fossil of the Silurian-Late Devonian tree-like probable fungus Prototaxites †Prototaxites
** †Prototaxites clevelandensis
* †Pseudaviculopecten
** †Pseudaviculopecten fasciculatus
** †Pseudaviculopecten scabridus
* †Pseudoactinodictyon
** †Pseudoactinodictyon stearni
** †Pseudoactinodictyon vagans
* †Pseudoatrypa
** †Pseudoatrypa devoniana
* †Pseudobigalea
** †Pseudobigalea crista
* †Pseudocolpomya
** †Pseudocolpomya miseneri
* †Pseudolingula
* †Pseudomonotis
** †Pseudomonotis equistriata
** †Pseudomonotis hawni
** †Pseudomonotis millhorni – type locality for species
* †Pseudomulceodens
** †Pseudomulceodens cancellatus
* †Pseudooneotodus
** †Pseudooneotodus bicornis
* †Pseudophorus
** †Pseudophorus antiquus
* †Pseudorthoceras
** †Pseudorthoceras knoxense
* †Pseudozygopleura
** †Pseudozygopleura acuminata
** †Pseudozygopleura angustata
** †Pseudozygopleura assertonsoris
** †Pseudozygopleura baltea – type locality for species
** †Pseudozygopleura cirritus
** †Pseudozygopleura contractus
** †Pseudozygopleura deloi
** †Pseudozygopleura eximia
** †Pseudozygopleura funis
** †Pseudozygopleura girtyi
** †Pseudozygopleura gradatus
** †Pseudozygopleura irrugata
** †Pseudozygopleura kellettae – or unidentified comparable form
** †Pseudozygopleura lanceolatus
** †Pseudozygopleura limus
** †Pseudozygopleura macra – or unidentified comparable form
** †Pseudozygopleura mucronatus
** †Pseudozygopleura multicostata – or unidentified comparable form
** †Pseudozygopleura pagoda – or unidentified comparable form
** †Pseudozygopleura palus – type locality for species
** †Pseudozygopleura pandus
** †Pseudozygopleura peoriense
** †Pseudozygopleura pinquicula
** †Pseudozygopleura plummeri – type locality for species
** †Pseudozygopleura pluricostata
** †Pseudozygopleura pugonis
** †Pseudozygopleura pulchra
** †Pseudozygopleura rectus
** †Pseudozygopleura schucherti – or unidentified comparable form
** †Pseudozygopleura scitula
** †Pseudozygopleura scruposus
** †Pseudozygopleura semicostata
** †Pseudozygopleura sinuosior
** †Pseudozygopleura subulatus
** †Pseudozygopleura tenuivirga
** †Pseudozygopleura variegata
* †Psiloconcha
** †Psiloconcha grandis
** †Psiloconcha inornata
** †Psiloconcha sinuata
* †Pterinea
** †Pterinea corrugatus
** †Pterinea demissa
* †Pterinopecten
** †Pterinopecten undosus
* †Pterochiton
** †Pterochiton carbonarius
** †Pterochiton spatulatus
* †Pterospermella
** †Pterospermella capitana
** †Pterospermella latibalteus
** †Pterospermella radiata
** †Pterospermella solis
* †Pterotheca
* Life restoration of the Silurian-Middle Devonian eurypterid ("sea scorpion") Pterygotus †Pterygotus
** †Pterygotus carmani
* †Ptilodictya
* †Ptomatis
** †Ptomatis proteiforme
* †Ptotosalvinia
** †Ptotosalvinia furcata
* †Ptychocarpus
* †Ptychocrinus
* †Ptychomphalina
** †Ptychomphalina lucina
** †Ptychomphalina regulata
* †Ptychopteria
** †Ptychopteria flabellum
* †Ptychospirina
** †Ptychospirina varians
* †Ptyonius
** †Ptyonius marshii – type locality for species
* †Pugnax
** †Pugnax utah
* †Punctatisporites
** †Punctatisporites aerarius
** †Punctatisporites glaber
** †Punctatisporites minutus
** †Punctatisporites obesus
* †Punctatisporties
** †Punctatisporties minutus
* †Punctatosporites
** †Punctatosporites granifer
** †Punctatosporites minutus
** †Punctatosporites rotundus
* †Punctospirifer
** †Punctospirifer kentuckensis
* †Pustula
** †Pustula pertenuis
* †Pustulisphaeridium
** †Pustulisphaeridium levibrachium
* †Pyanomya
* †Pycnocrinus
* †Pyrenomeous

## 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
* †Quadrijugator

## 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
* †Rafinesquina
** †Rafinesquina alternata
** †Rafinesquina loxorhytis
** †Rafinesquina ponderosa
** †Rafinesquina squamula
* †Raistrickia
** †Raistrickia crinita
** †Raistrickia srinita
* †Ramphoprion
* †Raphistoma
* †Rasmussenoceras
* †Reinschospora
** †Reinschospora magnifica
* †Renalcis
* †Reptaria
** †Reptaria stolonifera
* †Reteocrinus
* †Reteporina
** †Reteporina striata
* †Retichonetes
* †Reticulatisporites
** †Reticulatisporites muricatus
* †Retispira
** †Retispira fascireticulatus – type locality for species
** †Retispira tenuilineata
** †Retispira waverliensis
* †Retrorsirostra
** †Retrorsirostra carleyi
* †Rhachicrinus
** †Rhachicrinus wrighti
* †Rhachiopteris
* †Rhapanocrinus
* †Rhegmaphyllum
** †Rhegmaphyllum daytonensis
* †Rhinidictya
* †Rhinocaris
** †Rhinocaris ehlersi
* †Rhipidomella
** †Rhipidomella pecosi
** †Rhipidomella penelope – or unidentified comparable form
** †Rhipidomella trigona
** †Rhipidomella vanuxemi
* †Rhipidothyris
* Fossil of the burrow ichnogenus Rhizocorallium †Rhizocorallium
* †Rhombodictyon
* †Rhombopora
** †Rhombopora lepidodendroides
* †Rhombotrypa
** †Rhombotrypa subquadrata
* †Rhopolonaria
** †Rhopolonaria venosa
* †Rhynchopora
* †Rhynchotrema
** †Rhynchotrema denatum
** †Rhynchotrema dentatum
* †Rhynchotreta
* †Rhytimya
** †Rhytimya compressa
** †Rhytimya faberi
** †Rhytimya lunulata
** †Rhytimya oehana
** †Rhytimya radiata
* †Richmondoceras
** †Richmondoceras brevicameratum
* †Rizoceras
* †Ropalonaria
* †Royalella
** †Royalella quadrolirata – type locality for species
** †Royalella swallowiana – type locality for species
* †Ruedemannia
** †Ruedemannia trilix – type locality for species
* †Rugomena
** †Rugomena vetusta
* †Rugosochonetes
* Fossil found in southern Ohio of the arthropod burrow ichnogenus Rusophycus †Rusophycus
** †Rusophycus biloba

## 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
* †Saccella
** †Saccella parva
* †Salpingostoma
** †Salpingostoma richmondensis – tentative report
* †Samaropsis
* †Sanguinolites
** †Sanguinolites cuneatus
** †Sanguinolites hekitoensis – type locality for species
* Restoration of the Carboniferous amphibian Sauropleura †Sauropleura – type locality for genus
** †Sauropleura pectinata – type locality for species
* †Schellwienella
* †Schistoceras
* †Schizambon – tentative report
* †Schizoblatta – type locality for genus
** †Schizoblatta alutacea – type locality for species
* †Schizocrania
** †Schizocrania filosa
* †Schizodus
** †Schizodus acuminatus – type locality for species
** †Schizodus affinis
** †Schizodus appressus
** †Schizodus chesterensis – or unidentified comparable form
** †Schizodus curtus
** †Schizodus subcircularis
** †Schizodus wheeleri
* †Schizolopha
* †Schizophoria
** †Schizophoria ferronensis
** †Schizophoria impressa
* †Schlotheimophyllum
** †Schlotheimophyllum benedicti
** †Schlotheimophyllum patellatum
* †Schuchertella
** †Schuchertella interstriata
* †Schuchertoceras
* †Scolithos
** †Scolithos laxata
* †Sedgwickia – tentative report
* †Semicoscinium
* †Semipora – tentative report
** †Semipora ehlersi
* †Septopora
** †Septopora biserialis
** †Septopora robusta
* †Serpulites
* †Serpulospira
** †Serpulospira diversiformis
* †Sevillia
** †Sevillia sevillensis
** †Sevillia trinucleata
* †Shansiella
** †Shansiella beckwithana
** †Shansiella carbonaria
** †Shansiella insecta
* †Shideleroceras
* Fossilized stump of the Carboniferous-Permian club moss relative Sigillaria †Sigillaria
** †Sigillaria brardii
** †Sigillaria elegans
** †Sigillaria ficoides
** †Sigillaria lacoei
** †Sigillaria laurenciana
** †Sigillaria mamillaris
** †Sigillaria orbicularis
** †Sigillaria pileata – type locality for species
** †Sigillaria rugosa
* †Sigillariostrobus
* †Silfonocrinus
** †Silfonocrinus siluricus
* †Silicaster
** †Silicaster esseri
* †Similodonta – tentative report
* †Sinuites
** †Sinuites cancellatus
** †Sinuites granistriatus
** †Sinuites subcompressa
* Modern specimen of the marine bivalve Solemya Solemya
** †Solemya radiata
** †Solemya sharonensis – type locality for species
* †Soleniscus
** †Soleniscus aplatus – type locality for species
** †Soleniscus klipparti
** †Soleniscus primigenia
** †Soleniscus primogenium
** †Soleniscus regularis
** †Soleniscus typicus
* †Solenomorpha
** †Solenomorpha lamborni
* †Solisphaeridium
** †Solisphaeridium astrum
** †Solisphaeridium clavum
** †Solisphaeridium folliculum
** †Solisphaeridium rigispinosum
* †Sowerbyella
** †Sowerbyella rugosa
* †Spatiopora
* †Sphenolium
* †Sphenophragmus
** †Sphenophragmus nanus – or unidentified comparable form
* Fossilized leaves and branches of the Devonian-Triassic horsetail relative Sphenophyllum †Sphenophyllum
** †Sphenophyllum majus
** †Sphenophyllum oblongifolium
* †Sphenopteris
** †Sphenopteris elegans – or unidentified comparable form
** †Sphenopteris minutisecta
* †Sphenosphaera
** †Sphenosphaera centervillensis – type locality for species
** †Sphenosphaera fiscellostriata – type locality for species
** †Sphenosphaera opertus – type locality for species
** †Sphenosphaera recurvus – type locality for species
* †Sphenothallus
* †Spiloblattina
** †Spiloblattina variegata – type locality for species
* †Spinocyrtia
** †Spinocyrtia euryteines – report made of unidentified related form or using admittedly obsolete nomenclature
* †Spinosporites
** †Spinosporites exiguus
* †Spinulicosta
** †Spinulicosta spinulicosta
* †Spinyplatyceras
** †Spinyplatyceras dumosum
* Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer †Spirifer
** †Spirifer opimus
** †Spirifer pennatus
* †Spiromphalus
** †Spiromphalus pervius – type locality for species
* Spiropteris
* Spirorbis
** †Spirorbis arkonensis
** †Spirorbis planum
* †Spiroscala
** †Spiroscala solida
* †Spongentactinella
** †Spongentactinella veles
* †Sporangites
** †Sporangites huronensis
* †Spyroceras
* †Staufferoceras
* †Stegocoelia
** †Stegocoelia copei – or unidentified comparable form
* †Stegops
** †Stegops newberryi – type locality for species
* †Stellinium
** †Stellinium cristatum
** †Stellinium inflatum
** †Stellinium octoaster
* †Stelodictyon
* †Stereoaster
** †Stereoaster squamosus
* †Stereostylus
** †Stereostylus amesensis
* †Stereotoechus
** †Stereotoechus typicus – or unidentified comparable form
* Life restorations of a male (foreground) and female (background) of the Late Devonian-Carboniferous Chimaera relative Stethacanthus †Stethacanthus
** †Stethacanthus altonensis
* †Stibarocrinus
** †Stibarocrinus centervillensis
* †Stictoporella
* †Stictoporina
** †Stictoporina granulifera
* †Stigmatella
** †Stigmatella catenulata
** †Stigmatella crenulata
** †Stigmatella dychei
* Stomatopora
* †Straparollus
** †Straparollus hecale – or unidentified comparable form
** †Straparollus rudis – or unidentified comparable form
* †Strataster
** †Strataster devonicus
* †Streblochondria
* †Streblopteria
** †Streblopteria oklahomensis
* †Streblotrypa
** †Streblotrypa anomala
** †Streblotrypa hamiltonensis
* †Streptaster
** †Streptaster vorticellatus
* †Streptelasma
** †Streptelasma divaricans
* †Striatopora
** †Striatopora flexuosa
** †Striatopora intermittens
* †Strobeus
** †Strobeus brevis
** †Strobeus immanis
** †Strobeus intercalaris
** †Strobeus paludinaeformis
* †Stromatocerium
** †Stromatocerium granulosum
* †Stromatopora
* †Strombodes
** †Strombodes socialis
* †Strophalosia
** †Strophalosia truncata
* †Stropheodonta
** †Stropheodonta demissa
* †Strophodonta
** †Strophodonta demissa – report made of unidentified related form or using admittedly obsolete nomenclature
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
** †Strophomena concordensis
** †Strophomena erratica
** †Strophomena extenuata
** †Strophomena maysvillensis
** †Strophomena neglecta
** †Strophomena nutans
** †Strophomena planoconvexa
** †Strophomena planumbona
** †Strophomena sulcata
* †Strophostylus
* †Sturgeonospira – type locality for genus
** †Sturgeonospira tortula – type locality for species
* †Stygetoblatta – type locality for genus
** †Stygetoblatta latipennis – type locality for species
* †Styliolina
** †Styliolina fissurella
* †Stylonema
** †Stylonema robusta
* †Subulites
** †Subulites planilateralis – type locality for species
* †Sulcoretepora
** †Sulcoretepora deissi
** †Sulcoretepora incisurata
* †Synhomalonotus
* †Syntomopterus
** †Syntomopterus richardsoni
* Fossil of the Devonian tabulate coral Syringopora †Syringopora – tentative report
** †Syringopora reteformis
* †Syringostroma
** †Syringostroma cylindricum
** †Syringostroma densum
** †Syringostroma nodulatum
** †Syringostroma pustulosum
* †Syringothyris
** †Syringothyris bedfordensis
* †Syscioblatta
** †Syscioblatta anomala – type locality for species
** †Syscioblatta minor – type locality for species
** †Syscioblatta misera – type locality for species
** †Syscioblatta obscura – type locality for species
** †Syscioblatta steubenvilleana – type locality for species
* †Sysciophlebia
** †Sysciophlebia acutipennis – type locality for species
** †Sysciophlebia adumbrata – type locality for species
** †Sysciophlebia affinis – type locality for species
** †Sysciophlebia balteata
** †Sysciophlebia benedicta – type locality for species
** †Sysciophlebia hybrida – type locality for species
** †Sysciophlebia nana – type locality for species
** †Sysciophlebia obtusa – type locality for species
** †Sysciophlebia picta – type locality for species
** †Sysciophlebia rotundata – type locality for species
** †Sysciophlebia schucherti – type locality for species
** †Sysciophlebia scudderi – type locality for species
** †Sysciophlebia variegata – type locality for species
** †Sysciophlebia whitei – type locality for species

## 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
* †Taeniaster
** †Taeniaster elegans
* †Taeniopteris
** †Taeniopteris lescuriana
** †Taeniopteris newberriana
* †Tamiobatis
** †Tamiobatis vetustus
* †Tanaocrinus
* †Tasmanites
* †Technophora
* †Technophorus – type locality for genus
** †Technophorus faberi – type locality for species
* †Teichichnus
* †Temnocheilus
** †Temnocheilus forbesianus
* Fossilized shell of the Early Ordovician-Late Devonian probable mollusc Tentaculites †Tentaculites
** †Tentaculites bellulus
** †Tentaculites gracilistriatus
* †Tetradium
* †Tetranota
** †Tetranota bidorsata
* †Tetrentactinia
** †Tetrentactinia barysphaera
** †Tetrentactinia gracilispinosa
** †Tetrentactinia quadrispinosa
** †Tetrentactinia somphosphaera
** †Tetrentactinia somphozona
** †Tetrentactinia spongacea
** †Tetrentactinia teuchestes
* †Thamnoptychia
** †Thamnoptychia alpenensis
** †Thamnoptychia labyrinthica
** †Thamnoptychia minuitissima
** †Thamnoptychia projecta – tentative report
** †Thamnoptychia silicensis
* †Thymospora
** †Thymospora obscura
** †Thymospora pseudothiessenii
* †Tirocrinus
** †Tirocrinus trochos
* †Tomoceras
** †Tomoceras gilliana – or unidentified comparable form
* †Torispora
** †Torispora securis
* †Tornacia
** †Tornacia stela
* †Tornoceras
** †Tornoceras uniagnulare
** †Tornoceras uniangulare
* †Toryniferella
* †Trachydomia
* †Tremanotus
* †Trematis
** †Trematis millepunctata
** †Trematis millepuntata
** †Trematis reticularis
* †Trematopora
* †Trepospira
** †Trepospira illinoisensis
* Fossilized shell of the Ordovician nautiloid cephalopod Treptoceras †Treptoceras
** †Treptoceras byrnesi
** †Treptoceras cincinnatiensis
** †Treptoceras duseri
** †Treptoceras fosteri
* †Triarthrus
* †Triendoceras – tentative report
** †Triendoceras davisi
* †Trigonoglossa
** †Trigonoglossa nebrascensis
* †Trigrammaria
* †Trilonche
** †Trilonche cancellicula
** †Trilonche prolata
* †Trimerella
* †Triquitrites
** †Triquitrites additus
** †Triquitrites bransonii
** †Triquitrites crassus
** †Triquitrites minutus
** †Triquitrites sculptilis
** †Triquitrites spinosus
** †Triquitrites subspinosus – or unidentified comparable form
** †Triquitrites tribullatus
* †Trocholites
* †Trochonema
* †Trochonemopsis
** †Trochonemopsis meekanum
* †Troedssonoceras
* †Tropidodiscus
** †Tropidodiscus vesculilineatus – type locality for species
* †Tropidoleptus
** †Tropidoleptus carinatus
* †Truncatiramus – now regarded as a jr. synonym of Erettopterus
** †Truncatiramus perryensis
* Trypetesa
** †Trypetesa caveata
* †Trypherocrinus
** †Trypherocrinus brassfieldensis
* †Tuberculatosporites
** †Tuberculatosporites robustus
* Life restoration of the Carboniferous amphibian Tuditanus †Tuditanus – type locality for genus
** †Tuditanus punctulatus – type locality for species
* †Turbocrinus
** †Turbocrinus paunctum
* †Turbonopsis
** †Turbonopsis shumardii
* †Typanocrinus
** †Typanocrinus strombos

## 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
* †Ulrichia
** †Ulrichia nodosa
* †Umbotropis
** †Umbotropis filitexta – type locality for species
* †Uncinisphaera
** †Uncinisphaera lappa
* †Unellium
** †Unellium ampullium
** †Unellium elongatum
** †Unellium oscitans
* †Unklesbayella – type locality for genus
** †Unklesbayella geinitzi
* Fossil of the Ordovician-Devonian sea star Urasterella †Urasterella
** †Urasterella grandis

## 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
* †Vanuxemia
** †Vanuxemia waynesvillensis – type locality for species
* †Vaupelia
* †Vermiforichnus
** †Vermiforichnus clarkei – or unidentified comparable form
* †Verrucosisporites
** †Verrucosisporites cerosus
** †Verrucosisporites donarii
** †Verrucosisporites henshawensis
** †Verrucosisporites microtuberosus
** †Verrucosisporites microtuerosus
** †Verrucosisporites verrucosus
* †Veryhachium
** †Veryhachium roscidum
** †Veryhachium trispinosoides
* †Vesicaspora
** †Vesicaspora wilsonii
* †Vestispora
** †Vestispora fenestrata
** †Vestispora laevigata
* †Vinella
* †Vinlandostrophia
** †Vinlandostrophia acutilirata
** †Vinlandostrophia ponderosa
* †Vorticina
** †Vorticina cyrtolites

## 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
* Fossilized foliage of the Carboniferous-Permian conifer Walchia †Walchia
* †Walchiostrobus
* †Walliserodus
** †Walliserodus sancticlairi
* †Welleria – tentative report
* †Westonoceras
* †Whidbornella
* †Whiteavesia
* †Whitfieldella
* †Whitfieldoceras
* †Wilkingia
** †Wilkingia andrewsi
** †Wilkingia maxvillensis
** †Wilkingia terminale
* †Wilsonites
** †Wilsonites vesicatus
* †Worthenia
** †Worthenia parvula
** †Worthenia speciosa
** †Worthenia strigillata
** †Worthenia tabulata
* †Wurmiella
** †Wurmiella excavata

## 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
* †Xenocrinus
* Illustration of a fossil of the Carboniferous millipede Xyloiulus †Xyloiulus
** †Xyloiulus bairdi – type locality for species
* †Xysmacrinus
** †Xysmacrinus greenensis

## 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
* †Zascinaspis
* †Zirocrinus
** †Zirocrinus litos
* †Zittelloceras
* †Zonalosporites
** †Zonalosporites ellipticus
* Fossil of the feeding trace ichnogenus Zoophycos †Zoophycos
* †Zygocycloides
** †Zygocycloides magnus
* †Zygospira
** †Zygospira cincinnatiensis
** †Zygospira modesta