# List of the Mesozoic life of South Dakota

This list of the Mesozoic life of South Dakota contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of South Dakota and are between 252.17 and 66 million years of age.

## A

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* I
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* Acipenser – or unidentified comparable form
* †Actinocamax
* †Actinosepia
** †Actinosepia canadensis
* †Adocus
* †Agerostrea
** †Agerostrea translucida
* †Allosaurus
* Restorative model of the Late Cretaceous mammal Alphadon †Alphadon
** †Alphadon marshi
* †Amesoneuron
** †Amesoneuron FU37 – informal
* †Anatotitan
** †Anatotitan copei
* †Anisomyon
* †Anomia
** †Anomia gryphorhyncha
* †Antillocaprina
* †Anzu – type locality for genus
** †Anzu wyliei – type locality for species
* †Apatosaurus
* †Araucarioxylon
** †Araucarioxylon hoppertonae – type locality for species
* Mounted fossilized skeleton of the Late Cretaceous sea turtle Archelon †Archelon – type locality for genus
** †Archelon ischryos
** †Archelon ischyros – type locality for species
* †Artocarpus – report made of unidentified related form or using admittedly obsolete nomenclature
** †Artocarpus lessigiana
* Aspideretes
* †Asplenium
** †Asplenium Dicksonianum
* †Axestemys – or unidentified comparable form
** †Axestemys splendida

## B

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* Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites †Baculites
** †Baculites clinolobatus
** †Baculites compressus
** †Baculites grandis
** †Baculites larsoni
** †Baculites ovatus
** †Baculites yokoyamai
* †Bananogmius
** †Bananogmius evolutus
* †Baptornis
** †Baptornis varneri – type locality for species
* Restoration of the Late Jurassic sauropod dinosaur Barosaurus rearing to defend itself against a pair of the theropod Allosaurus †Barosaurus – type locality for genus
** †Barosaurus lentus – type locality for species
* †Basilemys
** †Basilemys sinuosa
* †Belemnitella
** †Belemnitella bulbosa
* Beryx – or unidentified related form
* †Binneyites
** †Binneyites carlilensis
* †Bisonia
** †Bisonia niemii
* †Bolodon
** †Bolodon hydei – type locality for species
* †Borealosuchus
** †Borealosuchus sternbergii
* †Borissiakoceras – tentative report
* Brachidontes
* Life restoration of the Late Cretaceous Alligator relative Brachychampsa †Brachychampsa
** †Brachychampsa montana
* †Brodavis
** †Brodavis baileyi – type locality for species
* †Bubodens – type locality for genus
** †Bubodens magnus – type locality for species

## C

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* †Caenagnathus
* †Calycoceras
** †Calycoceras boreale – type locality for species
** †Calycoceras dromense – or unidentified comparable form
* Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus †Camarasaurus
* Campeloma
* †Camptonectes
** †Camptonectes hallii
* †Carabites
** †Carabites russelli – type locality for species
* †Cataceramus – or unidentified comparable form
** †Cataceramus tenuilineatus
* †Caturus
** †Caturus dartoni – type locality for species
* †Celastrophyllum
** †Celastrophyllum pulchrum – type locality for species
* Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus †Champsosaurus
* †Cimexomys
* †Cimolodon
** †Cimolodon nitidus
* †Cimolomys
** †Cimolomys gracilis
* †Cissites
** †Cissites ingens
** †Cissites salisburiaefolius
* †Claibornites
** †Claibornites cedrensis
* †Claosaurus
** †Claosaurus affinis – type locality for species
* †Clavipholas
* Life restoration of the Late Cretaceous mosasaurid Clidastes †Clidastes
** †Clidastes propython
* †Clisocolus
** †Clisocolus moreauensis
* †Cocculus
** †Cocculus flabella
* †Collignoniceras
** †Collignoniceras collisniger – type locality for species
** †Collignoniceras jorgenseni – type locality for species
** †Collignoniceras percarinatum
** †Collignoniceras praecox
** †Collignoniceras vermilionense
** †Collignoniceras woolgari
** †Collignoniceras woollgari
* †Compsemys
** †Compsemys victa
* Corbula
** †Corbula crassimarginata
* †Corbulamella
** †Corbulamella gregaria
* †Crassatellina
** †Crassatellina hollandi
* †Crenella
** †Crenella elegantula
* †Cretodus
* Fossil of the Early Cretaceous-Eocene shark Cretolamna †Cretolamna
** †Cretolamna appendiculata
* †Cteniogenys
** †Cteniogenys antiquus
* Cucullaea
** †Cucullaea nebrascensis
* †Cupressinocladus
** †Cupressinocladus interruptus
* †Curculionites
** †Curculionites hylobioides – type locality for species
** †Curculionites northropi – type locality for species
** †Curculionites vulpinus – type locality for species
* †Cuspidaria
** †Cuspidaria moreauensis
** †Cuspidaria ventricosa
* Fossil of the Jurassic-Cretaceous cycad relative Cycadeoidea †Cycadeoidea
** †Cycadeoidea aspera – type locality for species
** †Cycadeoidea cicatricula – type locality for species
** †Cycadeoidea colei – type locality for species
** †Cycadeoidea colossalis – type locality for species
** †Cycadeoidea dacotensis
** †Cycadeoidea excelsa – type locality for species
** †Cycadeoidea formosa – type locality for species
** †Cycadeoidea furcata – type locality for species
** †Cycadeoidea ingens – type locality for species
** †Cycadeoidea insolita – type locality for species
** †Cycadeoidea jenneyana
** †Cycadeoidea Jenneyana
** †Cycadeoidea marshiana – type locality for species
** †Cycadeoidea mcbridei – type locality for species
** †Cycadeoidea McBridei – type locality for species
** †Cycadeoidea minnekahtensis – type locality for species
** †Cycadeoidea nana – type locality for species
** †Cycadeoidea occidentalis – type locality for species
** †Cycadeoidea paynei – type locality for species
** †Cycadeoidea pulcherrima – type locality for species
** †Cycadeoidea stillwelli – type locality for species
** †Cycadeoidea turrita – type locality for species
** †Cycadeoidea Wellsii – type locality for species
* †Cyclurus
** †Cyclurus fragosus
* †Cymbophora
** †Cymbophora warrenana
* Cyrtodaria
** †Cyrtodaria minuta

## D

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* †Dakotadon
** †Dakotadon lakotaensis
* Restoration of the Late Cretaceous dromaeosaurid ("raptor") Dakotaraptor preying upon an ostrich dinosaur †Dakotaraptor – type locality for genus
** †Dakotaraptor steini – type locality for species
* †Dakoticancer
** †Dakoticancer overanus
* †Delphodon
** †Delphodon comptus – or unidentified comparable form
* †Desmatochelys
** †Desmatochelys lowi
* †Didelphodon
** †Didelphodon vorax – or unidentified comparable form
* †Diplodocus
* †Discoscaphites
** †Discoscaphites conradi
** †Discoscaphites gulosus
** †Discoscaphites rossi – type locality for species
* †Dolichorhynchops
** †Dolichorhynchops osborni
* †Dosiniopsis
** †Dosiniopsis deweyi
* †Drepanochilus
** †Drepanochilus evansi
* †Dryophyllum
** †Dryophyllum subfalcatum
** †Dryophyllum tenneseensis
* †Dunveganoceras
** †Dunveganoceras pondi

## E

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* †Edmontonia
** †Edmontonia longiceps
* Life restoration of the Late Cretaceous duck-billed dinosaur Edmontosaurus annectens †Edmontosaurus
* †Elasmosaurus
** †Elasmosaurus intermedius – type locality for species
* †Elatides
** †Elatides longifolia
* †Ellipsoscapha
* †Embaphias – type locality for genus
** †Embaphias circulosus – type locality for species
* †Enchodus
* †Erlingdorfia
** †Erlingdorfia montana
* †Ethmocardium
** †Ethmocardium welleri
* †Eubostrychoceras
** †Eubostrychoceras matsumotoi
* †Eucalycoceras
** †Eucalycoceras pentagonum
* †Eutrephoceras
** †Eutrephoceras dekayi

## F

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* †Fokieniopsis
** †Fokieniopsis catenulata

## G

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* †Galagadon – type locality for genus
** †Galagadon nordquistae – type locality for species
* †Geosternbergia
** †Geosternbergia maiseyi – type locality for species
* Gleichenia
** †Gleichenia Zippei
* Life restoration of the Late Cretaceous mosasaur Globidens †Globidens
** †Globidens alabamensis
** †Globidens dakotensis – type locality for species
** †Globidens schurmanni – type locality for species
* †Glossozamites
** †Glossozamites Fontaineanus – type locality for species
* †Glyptops
* Glyptostrobus
** †Glyptostrobus europaeus
* †Goniomya
** †Goniomya americana
* Life restoration of the Late Cretaceous tyrannosaur Gorgosaurus †Gorgosaurus
* †Grammatodon
** †Grammatodon sulcatinus
* †Granocardium
** †Granocardium whitei
* †Graphidula
** †Graphidula culbertsoni
* †Grewiopsis
** †Grewiopsis saportana
* †Gypsonictops
** †Gypsonictops hypoconus
* †Gyrostrea
** †Gyrostrea subtrigonalis

## H

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* †Hainosaurus
** †Hainosaurus neumilleri – type locality for species
* †Hamites
** †Hamites cimarronensis
* †Helopanoplia
** †Helopanoplia distincta
* Hemiaster
** †Hemiaster beecheri
* †Hercorhynchus
** †Hercorhynchus hollandi
* Life restoration of the Late Cretaceous toothed bird Hesperornis †Hesperornis
** †Hesperornis regalis – or unidentified comparable form
* Hiatella – tentative report
* †Hindsiella
** †Hindsiella corsonensis
* †Hoplitosaurus
** †Hoplitosaurus marshi – type locality for species
* †Hoploparia
* †Hoploscaphites
** †Hoploscaphites comprimus
** †Hoploscaphites melloi – type locality for species
** †Hoploscaphites nicolletii
* †Hulettia
** †Hulettia americana – type locality for species
* †Hypoxytoma
** †Hypoxytoma nebrascana
* †Hypsilophodon
** †Hypsilophodon wielandi – type locality for species

## I

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* †Ichthyodectes
* †Infernolestes – type locality for genus
** †Infernolestes rougieri – type locality for species
* Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size †Inoceramus
** †Inoceramus apicalis
** †Inoceramus ginterensis
** †Inoceramus tenuis – or unidentified related form
** †Inoceramus tenuistriatus – tentative report
* †Ischyodus
** †Ischyodus rayhaasi
* Isurus

## J

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* †Jeletskytes
** †Jeletskytes nodosus
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes †Jeletzkytes
** †Jeletzkytes dorfi
** †Jeletzkytes nebrascensis
** †Jeletzkytes spedeni – type locality for species
* Juliacorbula
** †Juliacorbula crassimarginata
* Jupiteria
** †Jupiteria scitula

## L

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* †Lakotalestes – type locality for genus
** †Lakotalestes luoi – type locality for species
* Lamna
* †Laurophyllum
** †Laurophyllum wardiana
* †Leepierceia
** †Leepierceia preartocarpoides
* Fossilized skull of the Late Cretaceous alligator relative Leidyosuchus †Leidyosuchus
* †Lemnaceae
** †Lemnaceae scutatum
* †Lepidotes – tentative report
** †Lepidotes lacotanus
* Lepisosteus
** †Lepisosteus occidentalis
* †Leptalestes
** †Leptalestes cooki
** †Leptalestes krejcii
* †Leptosolen
* Limopsis
** †Limopsis striatopunctatus
* †Lioplacodes
* †Lucina – tentative report

## M

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* Malletia
** †Malletia evansi
* †Marmarthia
** †Marmarthia pearsonii
** †Marmarthia trivialis
* †Martinectes
** †Martinectes bonneri
* †Melvius
** †Melvius thomasi
* †Meniscoessus
** †Meniscoessus robustus
* †Mesodma
** †Mesodma formosa
** †Mesodma hensleighi
** †Mesodma thompsoni
* †Modiolus
** †Modiolus attenuatus – or unidentified related form
** †Modiolus galpinianus
** †Modiolus meeki
* Life restoration of two of the Late Cretaceous Mosasaurus †Mosasaurus
** †Mosasaurus missouriensis – type locality for species
* †Myledaphus
** †Myledaphus bipartitus

## N

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* A living Nelumbo lotus †Nelumbo
** †Nelumbo FU62 – informal
* †Neocardioceras
** †Neocardioceras transiens – type locality for species
* †Nonactaeonina
* †Nortedelphys
** †Nortedelphys jasoni
* Nucula
** †Nucula cancellata
** †Nucula percrassa
** †Nucula planomarginata
* Nuculana
** †Nuculana grandensis
** †Nuculana scitula
* †Nymphalucina
** †Nymphalucina occidentalis

## O

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* †Opertochasma
** †Opertochasma cuneatum
* †Ophiomorpha
** †Ophiomorpha nodosa
* Life restoration of the Late Cretaceous ostrich dinosaur Ornithomimus †Ornithomimus
* †Osmakasaurus
** †Osmakasaurus depressus – type locality for species
* Ostrea
** †Ostrea translucida
* †Otoscaphites
** †Otoscaphites seabeensis
* †Oxytoma
** †Oxytoma nebrascana

## P

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* Fossilized skeleton of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus †Pachycephalosaurus – type locality for genus
** †Pachycephalosaurus wyomingensis – type locality for species
* †Pachyrhizodus
* †Pahasapasaurus – type locality for genus
** †Pahasapasaurus haasi – type locality for species
* †Paleoaster
** †Paleoaster inquirenda
* †Palmoxylon
** †Palmoxylon cheyennense
* Panopea
** †Panopea occidentalis
* †Paronychodon
** †Paronychodon lacustris
* †Passumys – type locality for genus
** †Passumys angelli – type locality for species
* †Pediomys
** †Pediomys elegans
* Periploma
** †Periploma subgracile
* †Phelopteria
** †Phelopteria linguaeformis
** †Phelopteria minuta
** †Phelopteria quadrate
* Pholadomya
** †Pholadomya deweyensis
* †Pistia – report made of unidentified related form or using admittedly obsolete nomenclature
** †Pistia corrugata
* †Placenticeras
** †Placenticeras pseudoplacenta
* †Platanites
** †Platanites marginata
* Platanus
** †Platanus cissoides
* Life restoration of the Late Cretaceous mosasaur Platecarpus †Platecarpus
** †Platecarpus somenensis – or unidentified comparable form
** †Platecarpus tympaniticus
* †Plesiobaena
** †Plesiobaena antiqua
* †Plioplatecarpus
** †Plioplatecarpus primaevus – type locality for species
* †Podozamites
** †Podozamites lanceolatus
* †Prionocyclus
** †Prionocyclus macombi
** †Prionocyclus novimexicanus
* Fossilized skull of the Late Cretaceous mosasaur Prognathodon †Prognathodon
** †Prognathodon overtoni – type locality for species
* †Proplacenticeras
** †Proplacenticeras stantoni
* †Protacanthoceras
** †Protacanthoceras proteus
* †Protalphadon
** †Protalphadon lulli – tentative report
* †Protocardia
** †Protocardia subquadrata
* †Protolambda
** †Protolambda florencae
** †Protolambda hatcheri
* †Protosphyraena
* †Protostega
** †Protostega marshii – type locality for species
* †Pseudoptera
** †Pseudoptera subtortuosa
* Life restoration of the Late Cretaceous pterosaur Pteranodon †Pteranodon
** †Pteranodon longiceps
* †Ptychodus
** †Ptychodus janewayii
** †Ptychodus occidentalis

## Q

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* Quercus
** †Quercus Wardiana
* †Quereuxia
** †Quereuxia angulata

## R

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* †Rhamnus
** †Rhamnus cleburni
* †Rhombopsis
** †Rhombopsis subturritus
* Micrograph with magnified inset of a fossilized tooth of the Late Cretaceous theropod dinosaur Richardoestesia †Richardoestesia
** †Richardoestesia isosceles

## S

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* Sassafras
** †Sassafras Mudgii
* †Scaphites
** †Scaphites delicatulus
* †Semitriton
** †Semitriton buccinoides
* †Sequoia
** †Sequoia HC70 – informal
* †Serrifusus
** †Serrifusus dakotaensis
* Solemya
** †Solemya subplicata
* †Sourimis
** †Sourimis equilateralis
* Spaniorinus
** †Spaniorinus nicolleti
* Sphaerium
* †Sphenobaiera
** †Sphenobaiera ikorfatensis
* †Sphenodiscus
** †Sphenodiscus beecheri – tentative report
** †Sphenodiscus lobatus
** †Sphenodiscus pleurisepta
* †Spyridoceramus
** †Spyridoceramus tegulatus
* Squalicorax
** †Squalicorax falcatus
* Squalus
* †Stramentum
** †Stramentum haworthi
* Animated life restoration of the Late Cretaceous plesiosaur Styxosaurus †Styxosaurus
** †Styxosaurus browni
** †Styxosaurus snowii – type locality for species
* †Syncyclonema
** †Syncyclonema halli

## T

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* †Tancredia
** †Tancredia americana
* †Tarrantoceras
** †Tarrantoceras flexicostatum – or unidentified comparable form
* †Tatankaceratops – type locality for genus
** †Tatankaceratops sacrisonorum – type locality for species
* †Taxodiaceaepollenites
* Taxodium
** †Taxodium olrikii
* †Tellinimera
** †Tellinimera scitula
* †Tenuipteria
** †Tenuipteria fibrosa
* Life restoration of the Late Cretaceous herbivorous dinosaur Thescelosaurus †Thescelosaurus
** †Thescelosaurus neglectus
* †Thespesius – type locality for genus
** †Thespesius occidentalis – type locality for species
* †Torosaurus
** †Torosaurus latus
* †Toxochelys
** †Toxochelys latiremis
* †Trachodon
* †Trachybaculites
** †Trachybaculites columna
* †Tragodesmoceras
** †Tragodesmoceras carlilense
** †Tragodesmoceras carlilensis
* †Triceratops
** †Triceratops horridus
* †Trochodendroides
** †Trochodendroides nebrascensis
* †Tylosaurus
** †Tylosaurus proriger
* Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus †Tyrannosaurus
** †Tyrannosaurus rex

## 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
* †Vanikoropsis
** †Vanikoropsis nebrascensis
* †Viburnites
** †Viburnites Evansanus
* Shell of a Viviparus freshwater snail Viviparus

## 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
* †Willimactra

## 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
* †Yezoites
* Yoldia
** †Yoldia lacrima
** †Yoldia rectangularis

## 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
* Ziziphus
** †Ziziphus fibrillosus