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

A

• Acirsa
  • †Acirsa americana – or unidentified related form
  • †Acirsa clathrata
  • †Acirsa flexicostata
• 

  Life restoration of the Early Cretaceous theropod dinosaur Acrocanthosaurus
  †Acrocanthosaurus – or unidentified comparable form
• †Acteon
  • †Acteon cicatricosus
• †Acutostrea
  • †Acutostrea plumosa
• †Aenona
  • †Aenona eufaulensis
  • †Aenona georgiana
• †Agerostrea
  • †Agerostrea mesenterica
• 

  Fossilized skeleton of the Late Cretaceous-Oligocene Alligator relative Allognathosuchus
  †Allognathosuchus – or unidentified comparable form
• †Allosaurus
  • †Allosaurus medius – type locality for species
• †Ambigostrea
  • †Ambigostrea tecticosta
• Amuletum
  • †Amuletum dumasensis
  • †Amuletum fasciolatum – or unidentified comparable form
• 

  Assemblage of fossilized skeletons of the softshell turtle Amyda
  †Amyda
  • †Amyda prisca
• †Anatimya
  • †Anatimya anteradiata
• †Ancilla
  • †Ancilla acutula
• †Anomalofusus
  • †Anomalofusus lemniscatus
• †Anomia
  • †Anomia argentaria
  • †Anomia ornata
• †Anomoeodus
  • †Anomoeodus latidens
  • †Anomoeodus phaseolus
• †Anteglossia
• †Aphrodina
  • †Aphrodina tippana
• †Araloselachus
  • †Araloselachus cuspidata
• †Arctostrea
  • †Arctostrea falacata
• †Argillomys – type locality for genus
  • †Argillomys marylandensis – type locality for species
• †Ariadnaesporites
  • †Ariadnaesporites intermedius – type locality for species
• Arrhoges
• †Arundelconodon – type locality for genus
  • †Arundelconodon hottoni – type locality for species
• †Arundelemys – type locality for genus
  • †Arundelemys dardeni – type locality for species
• Astarte
  • †Astarte culebrensis
• 

  Life restoration of the Early Cretaceous sauropod dinosaur Astrodon
  †Astrodon
  • †Astrodon johnstoni – type locality for species

B

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites
  †Baculites
  • †Baculites baculus
  • †Baculites elisasi
  • †Baculites vertebralis
• †Bathytormus
  • †Bathytormus pteropsis
• †Bellifusus
  • †Bellifusus curvicostatus
• †Belliscala
• †Beretra
  • †Beretra gracilis – or unidentified comparable form
  • †Beretra ripleyana
  • †Beretra speciosa
• †Bottosaurus
  • †Bottosaurus harlani
• Botula
  • †Botula conchafodentis
  • †Botula lingua
  • †Botula ripleyana
• †Buccinopsis
  • †Buccinopsis crassicostata

C

• Cadulus
  • †Cadulus obnutus
• Caestocorbula
  • †Caestocorbula crassaplica
  • †Caestocorbula crassiplica
  • †Caestocorbula percompressa
  • †Caestocorbula terramaria
• †Camptonectes
  • †Camptonectes bubonis
• Carcharias
  • †Carcharias holmdelensis
  • †Carcharias samhammeri
• †Cardiaster
  • †Cardiaster marylandicus
• Cardium
• †Caveola
  • †Caveola acuta
• 

  Life restoration of the Late Triassic-Eocene lungfish Ceratodus
  †Ceratodus
  • †Ceratodus kranzi – type locality for species
• Cerithium
  • †Cerithium weeksi – or unidentified related form
• Chiloscyllium
  • †Chiloscyllium greeni
• †Cimoliasaurus
  • †Cimoliasaurus magnus
• †Clavatipollenites
• †Clavipholas
  • †Clavipholas pectorosa
  • †Clavipholas pectrosa
• †Coelosaurus
  • †Coelosaurus affinis
  • 

    Illustration of a fossilized tibia of the Late Cretaceous theropod dinosaur Coelosaurus antiquus
    †Coelosaurus antiquus
• †Coelurus
  • †Coelurus gracilis – type locality for species
• †Corax
  • †Corax pristiodontus
• Corbula
  • †Corbula subradiata
• †Corymya – or unidentified comparable form
  • †Corymya tennis
• †Couperites
  • †Couperites mauldinensis
• Crassatella
  • †Crassatella vadosa
• †Crenella
  • †Crenella elegantula
  • †Crenella serica
• †Creonella
  • †Creonella subangulata – or unidentified comparable form
  • †Creonella triplicata
• 

  Fossil of the Early Cretaceous-Eocene shark Cretolamna
  †Cretolamna
  • †Cretolamna appendiculata
  • †Cretolamna serrata – or unidentified comparable form
• Cucullaea
  • †Cucullaea capax
• †Cuna
  • †Cuna texana
• †Cuneolus
  • †Cuneolus pectrosa
  • †Cuneolus tippana
• Cuspidaria
  • †Cuspidaria ampulla
• †Cyclorisma
  • †Cyclorisma parva
• Cylichna
  • †Cylichna diversilirata
  • †Cylichna incisa
• †Cylindracanthus
• †Cymbophora
  • †Cymbophora appressa
  • †Cymbophora berryi
  • †Cymbophora wordeni
• †Cymella
  • †Cymella bella
• †Cyprimeria
  • †Cyprimeria alta
  • †Cyprimeria depressa
  • †Cyprimeria major

D

• Dasyatis
• 

  Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus
  †Deinonychus
  • †Deinonychus antirrhopus
• †Deinosuchus
  • †Deinosuchus rugosus
• †Dentalium
  • †Dentalium leve
• †Deussenia
  • †Deussenia bellalirata
  • †Deussenia ripleyana
• †Discoscaphites
  • †Discoscaphites abyssinius
  • †Discoscaphites conradi
  • †Discoscaphites gulosus
  • †Discoscaphites iris
• †Drilluta
  • †Drilluta buboanus
  • †Drilluta distans
  • †Drilluta marylandicus

E

• †Egertonia
• †Ellipsoscapha
  • †Ellipsoscapha cylindrica
  • †Ellipsoscapha mortoni
  • †Ellipsoscapha occidentalis – or unidentified comparable form
• 

  Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
  †Enchodus
  • †Enchodus dirus
  • †Enchodus ferox
  • †Enchodus feroz
• †Endoptygma
  • †Endoptygma leprosa
• †Eoacteon
  • †Eoacteon linteus
• †Etea
  • †Etea carolinensis
• †Eubaculites
  • †Eubaculites carinatus
  • †Eubaculites latecarinatus
• †Eufistulana
• †Eufistulina
• †Eulima
  • †Eulima clara
  • †Eulima monmouthensis
• †Euspira
  • †Euspira rectilabrum
  • †Euspira reetilabrum
• †Eutrephoceras
  • †Eutrephoceras dekayi
• †Ewingia
  • †Ewingia problematica
• 

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

F

• †Flabellosmilia
  • †Flabellosmilia vaughani
• †Fulgerca
  • †Fulgerca attenuata – or unidentified related form
• †Fusimilis
  • †Fusimilis kummeli
  • †Fusimilis novemcostatus
  • †Fusimilis tippanus

G

• Galeorhinus
  • †Galeorhinus giradoti
• Ginglymostoma
• Glossus
• Glycimeris
  • †Glycimeris mortoni
• Glycymeris
  • †Glycymeris rotundata
• †Glyptops
  • †Glyptops caelatus – type locality for species
• †Goniochasma
• †Goniopholis
  • †Goniopholis affinis – type locality for species
• 

  Fossil negative with skin impressions of the theropod dinosaur footprint ichnogenus Grallator
  †Grallator – or unidentified comparable form
• †Granocardium
  • †Granocardium dumosum
  • †Granocardium eufalense
  • †Granocardium kuemmeli
  • †Granocardium kummeli
  • †Granocardium lowei
• †Graphidula
  • †Graphidula multicostata
  • †Graphidula terebriformis
• †Gryphaeostrea
  • †Gryphaeostrea vomer
• Gyrodes
  • †Gyrodes americanus
  • †Gyrodes spillmani
  • †Gyrodes subcarinatus
  • †Gyrodes supraplicatus

H

• †Hadrodus
• 

  Life restoration of the Late Cretaceous mosasaur Halisaurus
  †Halisaurus
  • †Halisaurus platyspondylus
• †Hamatia – type locality for genus
  • †Hamatia elkneckensis – type locality for species
• †Hamulus
  • †Hamulus falcatus
  • †Hamulus huntensis – tentative report
  • †Hamulus onyx
  • †Hamulus squamosus
• †Hercorhynchus
  • †Hercorhynchus trililatus
• †Hercorhyncus
  • †Hercorhyncus pagodaformis
  • †Hercorhyncus tippanus
• Heterodontus
• †Heteromorpha
  • †Heteromorpha ammonite
• 

  Fossil of the Jurassic-Paleogene lobster Hoploparia
  †Hoploparia
  • †Hoploparia gladiator
• †Hybodus
• †Hydrotribulus
  • †Hydrotribulus asper
• †Hyposaurus
  • †Hyposaurus rogersii
• †Hypotodus
• †Hypsiloichnus – type locality for genus
  • †Hypsiloichnus marylandicus – type locality for species

I

• 

  Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
  †Inoceramus
• †Ischyodus
• †Ischyrhiza
  • †Ischyrhiza avonicola – or unidentified comparable form
  • †Ischyrhiza mira

J

• †Jeletzkytes
  • †Jeletzkytes criptonodosus
  • †Jeletzkytes nebrascensis
• Juliacorbula
  • †Juliacorbula monmouthensis

L

• Laternula
  • †Laternula robusta
• †Latiala
  • †Latiala lobata – or unidentified comparable form
• 

  Shells in multiple views of Latiaxis coral sea snails
  Latiaxis
• †Legumen
  • †Legumen ellipticum
  • †Legumen planulatum
• Lepisosteus
• †Leptosolen
  • †Leptosolen biplicata
  • †Leptosolen elongata
• Lima
  • †Lima pelagica
• Limatula
  • †Limatula acutilineata
• †Linearia
  • †Linearia crebelli
• †Linearis
  • †Linearis metastriata
• †Liopeplum
  • †Liopeplum canalis
  • †Liopeplum coronatum
  • †Liopeplum cretaceum
• †Liopistha
  • †Liopistha prolexta
  • †Liopistha protexta
• Lithophaga
  • †Lithophaga carolinensis
  • †Lithophaga julia
• †Longitubus
  • †Longitubus lineatus
• †Longoconcha
• 

  Fossilized shell of the Triassic-modern marine bivalve Lopha
  Lopha
  • †Lopha falcata
  • †Lopha mesenterica
• †Lowenstamia
  • †Lowenstamia cucullata
• †Loxsomopteris – type locality for genus
  • †Loxsomopteris anasilla – type locality for species
• †Lupira
• †Lycettia
  • †Lycettia tippana
  • †Lycettia tippanus
• †Lyriochlamys
  • †Lyriochlamys cretosa
  • †Lyriochlamys cretosus

M

• Malletia
  • †Malletia littlei
  • †Malletia longfrons
  • †Malletia longifrons
  • †Malletia stephensoni
• †Mathilda
  • †Mathilda cedarensis – or unidentified comparable form
  • †Mathilda corona
• †Mauldinia – type locality for genus
  • †Mauldinia mirabilis – type locality for species
• †Menabites
  • †Menabites delawarensis
  • †Menabites vanuxemi
• †Mesostoma
• †Micrabacia
  • †Micrabacia marylandica
  • †Micrabacia radiata
• †Modiolus
  • †Modiolus sedesclaris
  • †Modiolus sedesclarus
  • †Modiolus trigonus
• †Morea
  • †Morea cancellaria
  • †Morea marylandica
• 

  Life restoration of two of the Late Cretaceous Mosasaurus
  †Mosasaurus
  • †Mosasaurus conodon
  • †Mosasaurus dekayi
  • †Mosasaurus maximus
• Myliobatis
  • †Myliobatis obesus
• †Myobarbum
  • †Myobarbum monmouthensis – tentative report
• Myrtea
  • †Myrtea stephensoni
• †Mytilus – tentative report

N

• †Napulus
  • †Napulus octoliratus
• 

  Close-up portrait of a living Nebrius nurse shark
  Nebrius
• †Nemodon
  • †Nemodon eufalensis
  • †Nemodon eufaulensis
  • †Nemodon stantoni
• †Nonactaeonina
  • †Nonactaeonina graphoides – or unidentified comparable form
• Nucula
  • †Nucula camia
  • †Nucula cuneifrons
  • †Nucula percrassa
  • †Nucula perequalis
  • †Nucula severnensis
  • †Nucula slackiana
• Nuculana
  • †Nuculana rostratruncata
  • †Nuculana whitfieldi
• †Nymphalucina
  • †Nymphalucina linearia

O

• 

  A living Odontaspis sand shark
  Odontaspis
  • †Odontaspis aculeatus
  • †Odontaspis macrota
• †Odontobasis
  • †Odontobasis sulcata – or unidentified comparable form
• †Oligoptycha
• †Opertochasma
• †Osteopygis
  • †Osteopygis emarginatus

P

• †Paladmete
  • †Paladmete cancellaria
  • †Paladmete laevis
• †Paleopsephaea
  • †Paleopsephaea tenuilirata
• Panopea
  • †Panopea decisa
  • †Panopea monmouthensis
• †Paralbula
  • †Paralbula casei
• †Parmicorbula
  • †Parmicorbula percompressa
  • †Parmicorbula terramaria
• †Pelletixia
  • †Pelletixia amelguita – type locality for species
• †Periplomya
• †Peritresius
  • †Peritresius ornatus
• †Perrisonota
  • †Perrisonota littlei
  • †Perrisonota protexta
• †Phelopteria
  • †Phelopteria linguaeformis
  • †Phelopteria linguiformis
• Pholas
• †Pinna
  • †Pinna laqueata
• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras
  †Placenticeras
  • †Placenticeras placenta
  • †Placenticeras syrtale
• †Platananthus
  • †Platananthus potomacensis – type locality for species
• †Platanocarpus – type locality for genus
  • †Platanocarpus elkneckensis – type locality for species
  • †Platanocarpus marylandensis – type locality for species
• †Pleuriocardia
  • †Pleuriocardia eufalensis
• †Pleurocoelus – type locality for genus
  • †Pleurocoelus altus – type locality for species
  • †Pleurocoelus nanus – type locality for species
• †Plicatoscyllium
  • †Plicatoscyllium antiquum
  • †Plicatoscyllium derameei
• Polinices
  • †Polinices kummeli
• †Postligata
  • †Postligata wordeni
• †Praeleda
  • †Praeleda compar
• †Priconodon – type locality for genus
  • †Priconodon crassus – type locality for species
• 

  Life restoration of the Late Cretaceous mosasaur Prognathodon preying upon an ammonoid cephalopod
  †Prognathodon
  • †Prognathodon rapax
• †Promathildia
  • †Promathildia parvula – or unidentified comparable form
• †Propanoplosaurus – type locality for genus
  • †Propanoplosaurus marylandicus – type locality for species
• †Protocallianassa
  • †Protocallianassa mortoni
• †Protocardia
  • †Protocardia spillmani
• †Pseudohypolophus
  • †Pseudohypolophus menultyi
• †Pseudolimea
  • †Pseudolimea reticulata
  • †Pseudolimea serrata
• Pseudomalaxis
  • †Pseudomalaxis pateriformis
  • †Pseudomalaxis pilsbryi
  • †Pseudomalaxis stantoni
• †Pteria
  • †Pteria rhombica
• †Pterocerella
  • †Pterocerella tippana
• 

  Fossilized shell of the Jurassic-Cretaceous marine bivalve Pterotrigonia
  †Pterotrigonia
  • †Pterotrigonia eufalensis
  • †Pterotrigonia eufaulensis
  • †Pterotrigonia thoracica
• †Ptychotrygon
  • †Ptychotrygon vermiculata
• †Pugnellus
  • †Pugnellus densatus
• Pycnodonte
  • †Pycnodonte vesicularis
• †Pyrifusus
  • †Pyrifusus crassus
  • †Pyrifusus subdensatus
• †Pyropsis
  • †Pyropsis perlata
  • †Pyropsis prolixa

R

• Raja
  • †Raja farishi
• †Remera
  • †Remera cretacea – or unidentified comparable form
  • †Remera flexicostata
  • †Remera juncea
• †Remnita
  • †Remnita anomalocostata
  • †Remnita biacuminata – or unidentified comparable form
  • †Remnita hastata
• Rhinobatos
• 

  Restoration of the Late Cretaceous-Paleocene ray Rhombodus
  †Rhombodus
  • †Rhombodus binkhorsti
• †Rhombopsis
• Ringicula
  • †Ringicula clarki
  • †Ringicula pulchella
• Rissoina
  • †Rissoina tennesseensis

S

• †Sargana
  • †Sargana stantoni
• †Scambula
  • †Scambula perplana
• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites
  †Scaphites
  • †Scaphites hippocrepis
• Serpula
• †Serratolamna
  • †Serratolamna serrata
• †Serrifusus – tentative report
• †Solariorbis
  • †Solariorbis clara – or unidentified comparable form
• †Solyma
  • †Solyma elliptica
  • †Solyma gardnerae
• †Sourimis
  • †Sourimis georgiana – tentative report
• †Spanomera
  • †Spanomera marylandensis
• †Sphenodiscus
  • †Sphenodiscus lobatus
  • †Sphenodiscus pleurisepta
• 

  Life restoration of the Late Cretaceous shark Squalicorax
  Squalicorax
  • †Squalicorax falcatus
  • †Squalicorax kaupi
  • †Squalicorax pristodontus
• Squatina
  • †Squatina hassei
• †Stantonella
  • †Stantonella interrupta
• †Stephanodus
• Striarca
  • †Striarca cuneata
  • †Striarca saffordi
• †Striaticostatum
  • †Striaticostatum sparsum
• †Striatopollis
  • †Striatopollis paraneus
  • †Striatopollis vermimurus
• †Syncyclonema
  • †Syncyclonema simplicius

T

• Tellina
• †Tellinimera
  • †Tellinimera buboana
  • †Tellinimera gabbi
• †Tenea
  • †Tenea parilis
• 

  Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus
  †Tenontosaurus
• †Tenuipteria
  • †Tenuipteria argentea
  • †Tenuipteria argenteus
• †Thoracosaurus
  • †Thoracosaurus neocesariensis
• Trachycardium
  • †Trachycardium eufaulensis
• †Trachytriton
• 

  Fossilized shells of the Late Jurassic-modern tower snail Turritella
  Turritella
  • †Turritella bilira
  • †Turritella hilgardi
  • †Turritella paravertebroides
  • †Turritella tippana
  • †Turritella trilira
  • †Turritella vertebroides

U

• †Urceolabrum
  • †Urceolabrum tuberculatum

V

• †Veniella
  • †Veniella conradi
• †Vetericardiella
  • †Vetericardiella crenalirata
• †Vorhisia

W

• †Weeksia
  • †Weeksia peplanata

X

• †Xylophagella
  • †Xylophagella irregularis

References

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