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

A

• 

  A living Acteon barrel bubble sea snail
  †Acteon
  • †Acteon cretacea
• †Acutostrea
  • †Acutostrea plumosa
• †Aenona – tentative report
  • †Aenona eufaulensis
• †Agerostrea
  • †Agerostrea mesenterica
• †Amaurellina
  • †Amaurellina stephensoni
• †Ambigostrea
  • †Ambigostrea tecticosta
• 

  Fossilized shell of the Jurassic-Miocene sea snail Ampullina
  †Ampullina
  • †Ampullina lepta
  • †Ampullina lirata
  • †Ampullina meekana
• †Anaklinoceras
  • †Anaklinoceras reflexum
  • †Anaklinoceras tenuicostatum
• †Anchura – tentative report
• †Anisomyon – tentative report
  • †Anisomyon borealis
  • †Anisomyon jessupi
• †Anomalofusus
  • †Anomalofusus substriatus – tentative report
• 

  Interior and exterior of a shell of an Anomia, or jingle shell
  †Anomia
  • †Anomia argentaria
  • †Anomia radiata
  • †Anomia tellinoides
• †Anomoeodus
  • †Anomoeodus phaseolus
• †Aphrodina
  • †Aphrodina eufaulensis
  • †Aphrodina tippana
• 

  Fossilized skeleton of the Late Cretaceous bony fish Apsopelix
  †Apsopelix
  • †Apsopelix anglicus
• †Araloselachus
  • †Araloselachus cuspidata
• †Arca
  • †Arca macnairyensis
• Architectonica – or unidentified comparable form
  • †Architectonica voragiformis
• Arrhoges
• 

  Shell of a modern Astarte bivalve
  Astarte – tentative report
• †Avellana
  • †Avellana bullata

B

• †Baculites
  • †Baculites haresi
  • †Baculites minerensis
  • †Baculites ovatus
  • †Baculites undatus
• Barbatia
• 

  Fossilized guard of the Late Cretaceous belemnoid cephalopod Belemnitella
  †Belemnitella
  • †Belemnitella americana
• †Bellifusus
  • †Bellifusus curvicostatus
• †Belliscala – or unidentified comparable form
  • †Belliscala creideri
• †Beretra
• Bernaya
  • †Bernaya burlingtonensis
• 

  Life restoration of the Late Cretaceous bony fish Bonnerichthys with an anachronistic scuba diver to scale
  †Bonnerichthys
  • †Bonnerichthys gladius
• †Brachyrhizodus
  • †Brachyrhizodus wichitaensis
• †Breviarca
  • †Breviarca haddonfieldensis
  • †Breviarca richardsi – tentative report
• †Buccinopsis
• †Bulla
  • †Bulla macrostromata

C

• Cadulus
  • †Cadulus obnutus
• Caestocorbula
  • †Caestocorbula crassiplica
• †Calliomphalus
  • †Calliomphalus americanus – tentative report
  • †Calliomphalus nudus
  • †Calliomphalus paucispirilus
• †Camptonectes
  • †Camptonectes bellisculptus
  • †Camptonectes burlingtonensis
• †Cantharulus – tentative report
• 

  Shells of modern Capulus cap sea snails
  Capulus
• Cardium
  • †Cardium spillmani
• Caryocorbula
• †Caveola
• †Cenomanocarcinus
  • †Cenomanocarcinus robertsi
• Cerithium
  • †Cerithium weeksi
• †Chesapeakiceras
  • †Chesapeakiceras nodatum – type locality for species
• Clavagella
  • †Clavagella armata
• 

  Life restoration of the Late Cretaceous mosasaurid Clidastes
  †Clidastes – or unidentified comparable form
• Cliona
• †Clisocolus
• †Coelosaurus
  • †Coelosaurus antiquus
• Corbula
• Crassatella
  • †Crassatella newkirkensis
  • †Crassatella vadosa
• †Crenella
  • †Crenella serica
• †Cretodus
  • †Cretodus borodini
• 

  Fossil of the Early Cretaceous-Eocene shark Cretolamna
  †Cretolamna
  • †Cretolamna appendiculata
• †Cryptotexanites
  • †Cryptotexanites paedomorphicus – type locality for species
• Cucullaea
  • †Cucullaea tippana
  • †Cucullaea vulgaris
• Cuspidaria
  • †Cuspidaria grandis
• Cylichna
  • †Cylichna secalina
• †Cylindrocanthus – or unidentified comparable form
• †Cymbophora
  • †Cymbophora subtilis
• †Cymella
  • †Cymella bella
  • †Cymella ironensis
• †Cyprimeria
  • †Cyprimeria excavata

D

• †Dentalium
  • †Dentalium intercalatum
  • †Dentalium subarctuatum
• †Dhondtichlamys – tentative report
  • †Dhondtichlamys venustus
• 

  Restoration of several species of the Late Cretaceous ammonoid cephalopod Didymoceras
  †Didymoceras
  • †Didymoceras binodosum
  • †Didymoceras cheyennense
  • †Didymoceras draconis
  • †Didymoceras platycostatum
  • †Didymoceras stevensoni
• †Distefania
  • †Distefania lauginigeri
• †Drepanochilus
• †Dryptosaurus

E

• †Ecphora – tentative report
• †Ellipsoscapha
• Emarginula
• 

  Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
  †Enchodus
  • †Enchodus ferox
• †Endoptygma – or unidentified comparable form
  • †Endoptygma leprosa
• †Eoacteon
  • †Eoacteon percultus
• †Etea
  • †Etea carolinensis
• †Eufistulana
• †Eulophoceras – tentative report
• †Euspira
  • †Euspira rectilabrum
• †Eutrephoceras
  • †Eutrephoceras dekayi
• †Exiteloceras
  • †Exiteloceras jenneyi
• 

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

G

• Gastrochaena
• †Gegania
  • †Gegania bella
• †Gervilliopsis
• Ginglymostoma
  • †Ginglymostoma globidens
• †Ginglyostoma
  • †Ginglyostoma globidens
• 

  Life restoration of the Late Cretaceous mosasaur Globidens
  †Globidens
  • †Globidens alabamensis
• Glossus
• Glycymeris
  • †Glycymeris mortoni
• †Graciliala
  • †Graciliala johnsoni
• †Granocardium
  • †Granocardium dumosum
  • †Granocardium kummeli
  • †Granocardium tenuistriatum
• †Gryphaeostrea
  • †Gryphaeostrea vomer
• Gyrodes
  • †Gyrodes abyssinus
  • †Gyrodes americanus – tentative report
  • †Gyrodes supraplicatus
  • †Gyrodes vetrosus

H

• 

  Life restoration of the Late Cretaceous mosasaur Halisaurus
  †Halisaurus
  • †Halisaurus platyspondylus
• †Hamulus
  • †Hamulus major
  • †Hamulus onyx
• †Harduinia
  • †Harduinia florealis
• Haustator – or unidentified comparable form
  • †Haustator lenolensis
• Hemiaster
  • †Hemiaster delawarensis
  • †Hemiaster ungula
• †Hercorhyncus
• †Hoploscaphites
  • †Hoploscaphites vistulensis
• 

  Restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus
  †Hybodus
• †Hypotodus
  • †Hypotodus aculeatus

I

• 

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

J

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes
  †Jeletzkytes
  • †Jeletzkytes compressus
• Juliacorbula – or unidentified comparable form
  • †Juliacorbula swedesboroensis

L

• †Latiala – or unidentified comparable form
  • †Latiala lobata
• †Laxispira
  • †Laxispira lumbricalis
  • †Laxispira monilifera
• †Legumen
  • †Legumen concentricum
  • †Legumen ellipticum – tentative report
  • †Legumen planulatum
• 

  Illustration of a living Lepisosteus, or gar
  Lepisosteus – or unidentified comparable form
• †Leptosolen
  • †Leptosolen biplicata
• Lima
  • †Lima lorillardensis
• †Linearis
  • †Linearis contracta
  • †Linearis magnoliensis
  • †Linearis metastriata
• †Lingula – tentative report
• †Liopistha
  • †Liopistha alternata – tentative report
  • †Liopistha protexta
• 

  Electron micrograph of fossilized teeth from the Early Jurassic-Early Cretaceous freshwater shark Lissodus
  †Lissodus
  • †Lissodus babulskii
• Lithophaga
  • †Lithophaga julia
• †Longoconcha
• Lopha
  • †Lopha falcata
• †Lucina
• †Lyriochlamys – or unidentified comparable form
• Malletia
  • †Malletia longifrons
  • †Malletia protexta – tentative report
  • †Malletia stephensoni
• †Margaritella
• Martesia
• †Mathilda
• †Menabites
  • †Menabites delawarensis
  • †Menabites vanuxemi
• †Menuites
  • †Menuites portlocki
• †Micrabacia
  • †Micrabacia marylandica
• †Morea – or unidentified comparable form
  • †Morea marylandica

N

• †Napulus
  • †Napulus reesidei
• †Neithea
  • †Neithea quinquecostata
• †Nemocardium
  • †Nemocardium parahillanum
• †Nemodon
  • †Nemodon eufaulensis
• †Nonactaeonina
• †Notoceras
  • †Notoceras monotuberculatum
• 

  Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula
  Nucula
  • †Nucula percrassa
  • †Nucula whitfieldi – tentative report
• Nuculana
  • †Nuculana compressifrons
  • †Nuculana marlboroensis
• †Nuculano
  • †Nuculano stephensani
• †Nudivagus
• †Nymphalucina
  • †Nymphalucina parva

O

• 

  A living Odontaspis sand shark
  Odontaspis
  • †Odontaspis macrota
  • †Odontaspis sahammeri
  • †Odontaspis samhammeri
• †Ornithomimus
  • †Ornithomimus antique
• †Ornopsis – or unidentified comparable form
  • †Ornopsis digressa
• Ostrea

P

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Pachydiscus
  †Pachydiscus
• †Pachymelania
• †Paladmete
  • †Paladmete cancellaria
  • †Paladmete gardnerae
• †Palaeocypraea
  • †Palaeocypraea grooti – type locality for species
• Panopea
  • †Panopea decisa
• †Paralbula
  • †Paralbula casei
• † Paranomia
  • †Paranomia scabra
• †Paranomotodon
  • †Paranomotodon agustidens
  • †Paranomotodon angustidens
• †Parietiplicatum – or unidentified comparable form
  • †Parietiplicatum conicum
• †Parmicorbula
  • †Parmicorbula bisulcata
• Patella
  • †Patella tentorium
• †Pecten
• Pholadomya
  • †Pholadomya occidentalis
• Pholas – tentative report
• †Pinna
  • †Pinna laqueata
• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras
  †Placenticeras
  • †Placenticeras placenta
  • †Placenticeras syrtale
• †Pleuriocardia – or unidentified related form
  • †Pleuriocardia donohuensis
• †Pleurocardia – tentative report
  • †Pleurocardia uniformis
• †Plicatolamna
  • †Plicatolamna arcuata
• Plicatula
  • †Plicatula mullicaensis
• †Postligata
  • †Postligata crenata
  • †Postligata wordeni
• 

  Fossilized teeth of the Cretaceous shark Pseudocorax
  †Pseudocorax
  • †Pseudocorax granti
• †Pseudohypolophus
• †Pseudolimea
  • †Pseudolimea kerri
  • †Pseudolimea reticulata
• Pseudomalaxis
• †Pseudoschloenbachia
  • †Pseudoschloenbachia chispaensis – or unidentified comparable form
• 

  Life restoration of the Late Cretaceous pterosaur Pteranodon
  †Pteranodon – tentative report
• †Pteria
• †Pterocerella – or unidentified comparable form
  • †Pterocerella poinsettiformis
• †Pterotrigonia
  • †Pterotrigonia bartrami
  • †Pterotrigonia eufaulensis
  • †Pterotrigonia thoracia
• †Ptychotrygon
  • †Ptychotrygon vermiculata
• Pycnodonte
  • †Pycnodonte mutabilis
• †Pygurostoma
  • †Pygurostoma geometricum
• †Pyrifusus
  • †Pyrifusus sinuocostatus
• †Pyropsis
  • †Pyropsis perlata

R

• †Radiopecten
  • †Radiopecten mississippiensis
• †Remera – tentative report
• Rhinobatos
  • †Rhinobatos casieri
• 

  Restoration of the Late Cretaceous-Paleocene ray Rhombodus
  †Rhombodus
  • †Rhombodus laevis
• Ringicula
• †Ripleyella

S

• †Sargana
• †Scambula
  • †Scambula perplana
• 

  Restoration of several of the Early Cretaceous-Miocene shark Scapanorhynchus
  †Scapanorhynchus
  • †Scapanorhynchus texanus
• †Scaphites
  • †Scaphites hippocrepis
• †Sclerorhynchus
• Serpula
• †Solenoceras
  • †Solenoceras annulifer
• †Sourimis – or unidentified comparable form
  • †Sourimis georgiana
• †Spiroxybeloceras
  • †Spiroxybeloceras meekanum
• Spondylus
• 

  Life restoration of the Late Cretaceous shark Squalicorax
  Squalicorax
  • †Squalicorax falcatus
  • †Squalicorax kaupi
  • †Squalicorax pristodontus
• Squatina
  • †Squatina hassei
• †Stephanodus
• †Submortoniceras
  • †Submortoniceras punctatum
  • †Submortoniceras uddeni
• †Syncyclonema
  • †Syncyclonema conradi
  • †Syncyclonema simplicius
• †Synodontaspis
  • †Synodontaspis holmdelensis

T

• Tellina
• †Tenea
• Terebratulina
  • †Terebratulina cooperi
• †Texanites
• †Tintorium – tentative report
• 

  Mounted fossilized skeleton of the Late Cretaceous sea turtle Toxochelys
  †Toxochelys
• Trachycardium
  • †Trachycardium eufaulensis
  • †Trachycardium longstreeti – tentative report
• †Trigonia
• Trionyx
  • †Trionyx halophilus – type locality for species
• †Tundora – or unidentified comparable form
  • †Tundora tuberculata
• Turritella
  • †Turritella lorillardensis
  • †Turritella macnairyensis
  • †Turritella marshalltownensis
  • †Turritella merchantvillensis
  • †Turritella quadrilira
  • †Turritella tippana
  • †Turritella trilira
  • †Turritella vertebroides
• 

  Restoration of the Late Cretaceous mosasaur Tylosaurus
  †Tylosaurus
• Tympanotonos – or unidentified comparable form
  • †Tympanotonos cretacea

U

• †Unicardium – or unidentified comparable form
  • †Unicardium umbonatum
• †Urceolabrum
  • †Urceolabrum mantachieensis – tentative report

V

• †Veniella
  • †Veniella conradi
• †Vetericardiella
  • †Vetericardiella subcircula
• †Volutomorpha

W

• †Wadeopsamea – tentative report
• †Weeksia
• †Woodsella
  • †Woodsella typica

X

• Xenophora
• 

  Life restoration of the Cretaceous bony fish Xiphactinus
  †Xiphactinus

References

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