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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