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

A

• †Acutostrea
  • †Acutostrea plumosa
• †Aechmella
  • †Aechmella ozanensis – type locality for species
• Alderina
  • †Alderina inuber – type locality for species
• †Ambigostrea
  • †Ambigostrea tecticosta
• †Anchura
• 

  Interior and exterior of a shell of an Anomia, or jingle shell
  †Anomia
  • †Anomia argentaria
  • †Anomia texana
• †Aphrodina
  • †Aphrodina tippana
• †Atreta

B

• †Baculites
  • †Baculites crickmayi
  • †Baculites ovatus
  • †Baculites reduncus
  • †Baculites taylorensis
  • †Baculites undatus
• †Bellifusus
  • †Bellifusus spinosus
• Botula
  • †Botula conchafodentis
• 

  Fossil of the sauropod dinosaur footprint ichnogenus Brontopodus
  †Brontopodus
  • †Brontopodus birdi
• †Buccinopsis
  • †Buccinopsis solida

C

• Cadulus
  • †Cadulus obnutus
• Caestocorbula
  • †Caestocorbula crassaplica
  • †Caestocorbula crassiplica
• †Camptonectes
  • †Camptonectes bubonis
• †Cardiaster
  • †Cardiaster deciper – type locality for species
• 

  A living Caryophyllia solitary coral
  Caryophyllia
  • †Caryophyllia konincki
• †Castanopora
  • †Castanopora spooneri
• †Chedighaii – type locality for genus
  • †Chedighaii barberi – type locality for species
• †Cheethamia – type locality for genus
  • †Cheethamia howei – type locality for species
• †Cirroceras
  • †Cirroceras conradi
• †Classopollis
• †Classostrobus
  • †Classostrobus arkansensis
• Cliona
• Corbicula
  • †Corbicula arkansensis
• Crassatella
  • †Crassatella vadosa
• †Crenella
  • †Crenella serica
• 

  Shell of a Cucullaea, or false ark shell
  Cucullaea
  • †Cucullaea capax
• Cylichna
• †Cymella
  • †Cymella bella
• †Cyprimeria
  • †Cyprimeria alta
  • †Cyprimeria coonensis

D

• †Dentalium
  • †Dentalium leve
• †Desmophyllites
  • †Desmophyllites diphylloides
• †Dhondtichlamys
  • †Dhondtichlamys venustus
• †Diacanthopora
  • †Diacanthopora langi – type locality for species
• †Didymoceras
  • †Didymoceras binodosum
  • †Didymoceras clardyi
  • †Didymoceras cochleatum
  • †Didymoceras donezianum
  • †Didymoceras draconis
  • †Didymoceras mortoni
  • †Didymoceras platycostatum
  • †Didymoceras tortum
• †Dionella
  • †Dionella racemata – type locality for species
  • †Dionella vivistratensis – type locality for species
• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Discoscaphites
  †Discoscaphites
  • †Discoscaphites conradi
• †Douvilleiceras

E

• †Echinocorys
  • †Echinocorys texanus
• Ellisina
  • †Ellisina saratogaensis – type locality for species
• †Escharoides – tentative report
  • †Escharoides danei – type locality for species
  • †Escharoides erymnos – type locality for species
• †Eutrephoceras
• 

  Interior of a fossilized shell of the Jurassic-Cretaceous foam oyster Exogyra
  †Exogyra
  • †Exogyra costata
  • †Exogyra ponderosa

F

• †Flemingostrea
  • †Flemingostrea subspatula
• †Frurionella
  • †Frurionella parvipora

G

• 

  Fossilized shell of the Cretaceous ammonoid cephalopod Gaudryceras
  †Gaudryceras
• †Granocardium
  • †Granocardium bowenae
  • †Granocardium tholi
• †Gryphaeostrea
  • †Gryphaeostrea vomer

H

• Hemiaster
  • †Hemiaster humphreysanus
  • †Hemiaster wetherbyi
• †Heminautilus
  • †Heminautilus stantoni – type locality for species
• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Hoploscaphites
  †Hoploscaphites
  • †Hoploscaphites pumilis

I

• 

  Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
  †Inoceramus
• †Isomicraster
  • †Isomicraster danei – type locality for species

J

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes
  †Jeletzkytes
  • †Jeletzkytes nodosus

L

• †Lewyites
  • †Lewyites oronensis
• Limatula
  • †Limatula acutilineata
• †Linthia
  • †Linthia variabilis

M

• Malletia
  • †Malletia longfrons
  • †Malletia longifrons
• †Mathilda
  • †Mathilda ripleyana – or unidentified related form
• †Menuites
  • †Menuites portlocki – or unidentified comparable form
• †Micrabacia
  • †Micrabacia arkansasensis – type locality for species
• 

  Fossilized shell of the Late Cretaceous-Paleogene sea urchin Micraster
  †Micraster
  • †Micraster americanus
• Micropora – tentative report

N

• †Naomichelys
• †Neancyloceras
  • †Neancyloceras bipunctatum – or unidentified comparable form
• 

  Restoration of several species of the Late Cretaceous ammonoid cephalopod Nostoceras
  †Nostoceras
  • †Nostoceras approximans
  • †Nostoceras archiacianum
  • †Nostoceras arkansanum
  • †Nostoceras colubriformis
  • †Nostoceras helicinus
  • †Nostoceras hyatti
  • †Nostoceras multituberculatum
  • †Nostoceras pauper
  • †Nostoceras plerucostatum
  • †Nostoceras pulcher
• Nuculana
  • †Nuculana whitfieldi

O

• †Oxybeloceras
  • †Oxybeloceras crassum

P

• †Pachydiscus
  • †Pachydiscus arkansanus
• Panopea
  • †Panopea subplicata
• †Placenticeras
• 

  Restoration of the Late Cretaceous mosasaur Platecarpus
  †Platecarpus
• †Pleuriocardia
• †Prionochelys – type locality for genus
  • †Prionochelys nauta – type locality for species
• †Protocardia
  • †Protocardia spillmani
• †Pseudofrenelopsis
  • †Pseudofrenelopsis parceramosa
• †Pseudokossmaticeras
  • †Pseudokossmaticeras galicianum
• †Pseudophyllites
• †Pseudosaynella
  • †Pseudosaynella fimbriata – type locality for species
  • †Pseudosaynella walcotti
• †Pteria
• †Pterotrigonia
  • †Pterotrigonia thoracica
• Pulvinites
  • †Pulvinites argenteus
• Pycnodonte
  • †Pycnodonte vesiculare
  • †Pycnodonte vesicularis
• †Pyropsis

R

• Ramphonotus
  • †Ramphonotus pedunculatus – type locality for species

S

• Serpula
• †Solenoceras
  • †Solenoceras texanum – or unidentified comparable form
• †Solenophragma
  • †Solenophragma elongatum – type locality for species
  • †Solenophragma ovatum
• †Sphenodiscus
• 

  Shell of a Spondylus, or spiny oyster
  Spondylus
• †Stictostega – type locality for genus
  • †Stictostega durhami – type locality for species
• Striarca
• †Striaticostatum
• †Stylina
  • †Stylina arkansasensis – type locality for species
• †Syncyclonema
  • †Syncyclonema simplicius
  • †Syncyclonema travisanus

T

• †Tenea
  • †Tenea parilis
• †Thamnasteria
  • †Thamnasteria imlayi – type locality for species
• 

  Mounted fossilized skeleton of the Late Cretaceous sea turtle Toxochelys
  †Toxochelys – type locality for genus
  • †Toxochelys latiremis – type locality for species
• Trachycardium
• †Trachyscaphites
  • †Trachyscaphites redbirdensis
• †Tricephalopora
  • †Tricephalopora arkansasensis – type locality for species
  • †Tricephalopora larwoodi – type locality for species
• Turritella
  • †Turritella bilira
  • †Turritella trilira

U

• †Uhligella – tentative report

V

• †Veniella
  • †Veniella conradi

Z

• Zangerlchelys
  • †Zangerlchelys arkansaw – type locality for species

References

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