List of the Paleozoic life of Maryland
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This list of the Paleozoic 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 538.8 and 252.17 million years of age.
- †Acanthopecten – tentative report
- †Acanthotriletes
- †Acoblatta – type locality for genus
- †Acoblatta argillacea – type locality for species
- †Actinopteria
- †Aglaoglypta
- †Ambloblatta – type locality for genus
- †Ambloblatta bassleri – type locality for species
- †Ambocoelia
- †Ambonychia
- †Amphiscapha
Fossils of the Ordovician-Permian bryozoan Amplexopora - †Anapiculatisporites
- †Anapiculatisporites crassisetus – type locality for species
- †Anazyga
- †Anazyga recurvirostra – tentative report
- †Ancyrospora
- †Aneurospora
- †Anoplotheca
- †Anthraconeilo
- †Aparchites
- †Archaeoscyphia
- †Archaeotriletes
- †Archaeozonotriletes
- †Archimylacris
- †Archimylacris delicata – type locality for species
- †Arthroacantha
- †Arthroacantha punctobrachiata – or unidentified comparable form
- †Astartella
- †Atlanticocoelia
- †Atrypa
Fossilized shell of the Silurian-Late Devonian brachiopod Atrypa reticularis
- †Aviculopecten
- †Bactrites
- Bairdia
- †Bassipterus
- †Batostomella
- †Bellefontia
- †Bellefontia collieana – tentative report
Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon - †Beyrichia
- †Biharisporites
- †Bolbiprimitia
- †Bollia
- †Bonnemaia
- †Brachymylacris
- †Brachymylacris martini – type locality for species
- †Brochotriletes
- †Bucania – tentative report
- †Buthotrephis
- †Buthrotrephis
- †Byssonychia
- Bythocypris
- †Calamospora
- †Calymene
- †Calymene camerata
- †Calymene cresapensis
Fossils in enrolled posture of the Silurian trilobite Calymene niagarensis - †Calymene niagraensis
- †Camarotoechia
- †Cariniferella
- †Cavellina
- †Ceratopea
- †Cheliphlebia – tentative report
- †Cheliphlebia argillacea – type locality for species
- †Chonetes
- †Chonetina
- †Chonostrophia
Assemblage of fossilized shells of the Ordovician brachiopod Cincinnetina - †Clidophorus
- †Clitendoceras
- †Coelospira
- †Composita
- †Composita ovata – tentative report
- †Conularia
- †Convolutispora
- †Coreanoceras
Fossil of the Middle Ordovician-Carboniferous horn coral Cornulites - †Corvellites
- †Crurithyris
- †Cryptolithus
- †Ctenodonta
- †Culunana
- †Cupularostrum
- †Cyathophyllum
- †Cymatospira
- †Cyphomylacris – type locality for genus
- †Cyphomylacris atrata – type locality for species
- †Cyphotrypa
- †Cypricardella
- †Cypricardinia
- †Cyrtina
- †Cyrtodontula
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- †Dakeoceras
Fossil of the Late Ordovician-Middle Devonian trilobite Dalmanites - †Dekayia
- †Delthyris
- †Derbyia
- †Diaphanospora
- †Diaphelasma
- †Dibolbina
- †Dictyotriletes
- †Dinoblatta – type locality for genus
- †Dinoblatta cubitalis – type locality for species
- †Dinoblatta fortis – type locality for species
- †Diparelasma
- †Dizygopleura
- †Dizygopleura acuminata
- †Dizygopleura carinata
- †Dizygopleura conjugata
- †Dizygopleura costata
- †Dizygopleura gibba
- †Dizygopleura halli
- †Dizygopleura intermedia
- †Dizygopleura micula
- †Dizygopleura perrugosa
- †Dizygopleura pricei
- †Dizygopleura proutyi
- †Dizygopleura simulans
- †Dizygopleura subdivisa
- †Dizygopleura subovalis
- †Dizygopleura swartzi
- †Dizygopleura symmetrica
Life restoration of the Silurian eurypterid ("sea scorpion") Dolichopterus - †Doloresella
- †Donaldina
- †Drepanellina
- †Dunbarella
- †Dunbarella striata – type locality for species
- †Ecculiomphalus
- †Edmondia
- †Edmondia aspenwallensis
- †Edmondia pseudoreflexa – type locality for species
- †Eldredgeops
- †Elita
- †Ellesmeroceras
- †Emphanisporites
- †Encrinurus
- †Endocycloceras
- †Eospirifer
Life restoration of the Silurian-Early Devonian eurypterid ("sea scorpion") Erettopterus - †Escharendoceras
- †Euchondria
- †Euchondria levicula – tentative report
- †Eukloedenella
- †Euomphalus
- †Euphemites
Life restoration of Silurian eurypterid ("sea scorpion") Eurypterus - †Euthydesma
Fossil of the Late Ordovician-Permian tabulate coral Favosites - †Favosites niagarensis – or unidentified comparable form
- †Finkelnburgia
- †Finkelnburgia virginica – tentative report
- †Fistulipora
- †Flexicalymene
- †Floweria
- †Foveosporites
- †Gasconadia
- †Geminospora
- †Girtyspira
- †Glabrocingulum
- †Glyptoglossella
- †Glyptorthis
- †Glyptorthis equiconvexa – type locality for species
Fossilized shell of the Late Devonian-Late Triassic ammonoid cephalopod Goniatites - †Grammysia
- †Gyrodoma
- †Halliella
Fossil of the Ordovician bryozoan ("moss animal") Hallopora - †Healdia
- †Hebertella
- †Hemimylacris – type locality for genus
- †Hemimylacris bassleri – type locality for species
- †Heterotrypa
- †Hindella
- †Hippocardia
- †Hippocardia cumberlandiae – type locality for species
Fossilized shells of the Ordovician-Carboniferous sea snail Holopea - †Homeospira
- †Hormotoma
- †Hyolithes
- †Hystricosporites
- †Hystriculina – tentative report
- †Hystricurus
- †Inaperaturate
- †Ischyrodonta – tentative report
Fossil of the Middle-Late Ordovician giant trilobite Isotelus.
- †Juresania
- †Juresania symmetrica – tentative report
- †Lasiocrinus
- †Lasiocrinus scoparius – or unidentified comparable form
- †Lecanospira
- †Lecanospira compacta – tentative report
- †Leiorhynchus
- †Leperditia
- †Leptaena
- †Leptaena rhomboidalis – report made of unidentified related form or using admittedly obsolete nomenclature
- †Lepterditia
- †Leptodesma
- †Leptodesma marylandica
- †Leptodesma naviforme
- †Leptodesma nitida
- †Leptodesma spinerigum
- †Leptodesma subplana – or unidentified comparable form
- †Leptostrophia
- †Lesueurilla
- †Levenea
- †Lichenaria
Shell of the Cambrian-modern brachiopod Lingula - †Linoproductus
- †Liocalymene
- †Lobosiphon
- †Longispina
- †Lophotriletes
- †Loxonema
- †Lyrodesma
Life restoration of the Permian snake-like amphibian Lysorophus showing speculative egg-coiling behavior - †Lytospira
- †Macluritella
- †Macluritella marylandica – type locality for species
- †Mastigobolbina
- †Mcqueenoceras
- †Meekospira
- †Meekospira percuta – or unidentified related form
- †Megamolgophis
- †Melanoblattula – type locality for genus
- †Melanoblattula nigrescens – type locality for species
- †Meristina
Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras - †Metacoceras marylandica – type locality for species
- †Modiolopsis
- †Modiomorpha
- †Monticulipora
- †Mylacris
- †Mylacris lapsa – type locality for species
- †Mysticoceras
- †Narkema
- †Narkema alternatum – type locality for species
Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis - †Neochonetes
- †Neospirifer
- †Neospirifer dunbari – tentative report
- †Nucleospira
- †Nucularca
- †Nuculites
- †Nuculopsis
- †Obolella
- †Obolus – tentative report
- †Ochetopteron – type locality for genus
- †Ochetopteron canaliculatum – type locality for species
- †Octonaria
Restoration of the Cambrian trilobite Olenellus - †Olethroblatta
- †Olethroblatta lineolata – type locality for species
- †Ophileta
- †Orbiculoidea
- †Orbiculoidea missouriensis – tentative report
- †Ormoceras
- †Orospira
- †Orthoceras
- †Orthomylacris
- †Orthomylacris berryi – type locality for species
- †Orthomylacris recta – type locality for species
- †Orthonychia
- †Orthopora
- †Orthorhynchula
- †Pachyblatta – type locality for genus
- †Pachyblatta convexa – type locality for species
- †Pachyblatta radiata – type locality for species
- †Palaeoneilo
- †Palaeozygopleura
- †Palaeozygopleura glabra – tentative report
- †Palaeozygopleura hamiltoniae
- †Palaeozygopleura styliola
- †Palaeozygopleura terebra
- †Paleonucula
- †Paleyoldia – type locality for genus
- †Paracyclas
- †Paraechmina
- †Parajuresania
- †Parajuresania nebrascensis – tentative report
- †Parallelodon
- †Patellilabia
- †Patellilabia tentoriolum – tentative report
- †Permophorus
- †Peronopora – tentative report
- †Pharkidonotus
- †Pholidops
- †Pholidostrophia
- †Phragmosiphon
- †Phymatopleura
- †Pintopsis
- †Plagioglypta
Fossilized shell of the Silurian-Early Triassic sea snail Platyceras - †Platysiphon
- †Plectonotus
- †Plethobolbina
- †Pleurophorus
- †Pliendoceras
- †Polidevcia – type locality for genus
- †Polytoechia – tentative report
- †Praenucula
- †Proterocameroceras
- †Prothyris
- †Prothyris singewaldi – type locality for species
- †Protodouvillina
- †Psalikilus
- †Pseudoatrypa
- †Pseudorthoceras
- †Pseudozygopleura
- †Pseudozygopleura girtyi – or unidentified comparable form
- †Pterinea
Restoration of the Silurian-Middle Devonian eurypterid ("sea scorpion") Pterygotus - †Punctatisporites
- †Rafinesquina
- †Resserella
- †Reticularia
- †Retroclitendoceras
- †Retusotriletes
- †Rhabdosporites
- †Rhipidomella
- †Rhombopora – tentative report
- †Rhombopora lepidendroides – or unidentified comparable form
- †Rhynchospirina
- †Ribeiria
- †Rioceras
- †Ruedemannia – tentative report
- †Samarisporites
- †Samarisporites grossicorrugatus – type locality for species
- †Samarisporites grossicorugatus
- †Sansabella
- †Schellwienella
- †Schizodus
- †Schuchertella
- †Serpulopsis
- †Shansiella
- †Shansiella carbonaria – tentative report
- †Shellwienella
Modern specimen of the marine bivalve Solemya - †Soleniscus
- † Solenopsis
- †Sowerbyella
- †Spaniodera – tentative report
- †Spaniodera simplex – type locality for species
- †Spelaeotriletes
- †Spinozonotriletes
Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer - †Stegerhynchus
- †Stenosiphon
- †Stereostylus
- †Stichotrophia
- †Straparollus
- †Strobeus
Fossilized shell of the Ordovician-Silurian brachiopod Strophomena - †Syntrophinella
- †Tainoceras
- †Tancrediopsis
Fossilized shell of the Early Ordovician-Late Devonian probable mollusc Tentaculites - †Tetralobula
- †Trigonocera
- †Trimerus
- †Tritoechia
- †Truncalosia
- †Turbonopsis
- †Turbonopsis coronola – type locality for species
- †Waagenella
Fossilized head of the Silurian eurypterid ("sea scorpion") Waeringopterus - †Welleria
- †Whitfieldella
- †Worthenia
- †Worthenia castlemanensis – type locality for species
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.