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

• Acipenser – or unidentified comparable form
• †Actinocamax
• †Actinosepia
  • †Actinosepia canadensis
• †Adocus
• †Agerostrea
  • †Agerostrea translucida
• †Aletridelphys
  • †Aletridelphys florencae
  • †Aletridelphys hatcheri
• †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

• 

  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

• †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

• †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

• †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

• †Fokieniopsis
  • †Fokieniopsis catenulata

G

• †Galagadon – type locality for genus^[1]
  • †Galagadon nordquistae – type locality for species^[1]
• †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

• †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
• 

  Fossilized skeleton of the Early Jurassic bony fish Hulettia
  †Hulettia
  • †Hulettia americana – type locality for species
• †Hypoxytoma
  • †Hypoxytoma nebrascana
• †Hypsilophodon
  • †Hypsilophodon wielandi – type locality for species

I

• †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

• †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

• †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

• 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

• 

  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

• †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

• 

  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
• †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

• Quercus
  • †Quercus Wardiana
• †Quereuxia
  • †Quereuxia angulata

R

• †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

Base of the trunk of a living Sequoia tree with a human to scale

• 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

• †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

• †Vanikoropsis
  • †Vanikoropsis nebrascensis
• †Viburnites
  • †Viburnites Evansanus
• 

  Shell of a Viviparus freshwater snail
  Viviparus

W

• †Willimactra

Y

• †Yezoites
• Yoldia
  • †Yoldia lacrima
  • †Yoldia rectangularis

Z

• Ziziphus
  • †Ziziphus fibrillosus

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.