List of the Paleozoic life of Pennsylvania

This list of the Paleozoic life of Pennsylvania contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Pennsylvania and are between 538.8 and 252.17 million years of age.

Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris
Restorative model of the Cambrian arthropod Anomalocaris
Life restoration of the Late Devonian-Carboniferous tree Archaeopteris macilenta with insets detailing its anatomy
Fossil of the Cambrian trilobite Asaphiscus
Fossilized shell of the Silurian-Late Devonian brachiopod Atrypa reticularis
Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon
Fossilized bony armor of the Late Devonian placoderm fish Bothriolepis
Life restoration of the Late Devonian placoderm fish Bothriolepis
Life restoration of the Cambrian echinoderm Camptostroma
Assemblage of fossilized shells of the Ordovician brachiopod Cincinnetina
Coccosteus cuspidatus restoration, shown attacking multiple Palaeospondylus '
Fossilized foliage of the Carboniferous-Permian conifer relative Cordaites
Fossils and life restoration of the Silurian eurypterid ("sea scorpion") Ctenopterus
Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer
Life restoration of the Permian amphibian Diploceraspis
Life restoration of the Permian synapsid (mammal precursor) Edaphosaurus
Life restoration of the Silurian-Early Devonian eurypterid ("sea scorpion") Erettopterus
Fossil of the Late Ordovician-Permian tabulate coral Favosites
Fossil of the Cambrian trilobite Genevievella
Fossils of the Middle Ordovician-Early Devonian trilobite Gravicalymene
Life restoration of the Late Devonian eurypterid ("sea scorpion") Hallipterus
Life restoration of the Middle-Late Devonian placoderm fish Holonema
Life restoration of the Late Devonian four-limbed animal precursor Hynerpeton
Life restoration of the Permian amphibian Isodectes
Fossilized heads of the Silurian eurypterid ("sea scorpion") Kiaeropterus (specimens 1-8)
Fossil of the Cambrian trilobite Kootenia
Life restoration of the Carboniferous tree-sized club moss relative Lepidodendron
Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella
Life restoration of the Permian snake-like amphibian Lysorophus showing speculative egg-coiling behavior
Life restoration of the Late Ordovician eurypterid ("sea scorpion") Megalograptus
Fossilized shell of the Devonian brachiopod Mucrospirifer
Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis
Fronds of the Carboniferous seed fern Neuropteris
Fossil of the Cambrian trilobite Olenoides
Life restoration of the Carboniferous-Permian freshwater shark Orthacanthus
Restoration
Fossil of the Cambrian trilobite Pagetia
Assemblage of the Early-Middle Devonian brachiopod Paraspirifer
Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites
Fossil of the Devonian trilobite Phacops rana
Fossilized shell of the Silurian-Early Triassic sea snail Platyceras
Restoration of the Silurian trilobite Proetus
Illustration of a fossil of the Cambrian crustacean Protocaris
Fossil of the Silurian eurypterid ("sea scorpion") Rhinocarcinosoma
Illustration of fossilized shells of the mysterious Cambrian organism Salterella
Fossilized fin of the Devonian lobe-finned fish Sauripterus
Fossils of the Cambrian arthropod Sidneyia
Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer
Fossilized shell of the Ordovician-Silurian brachiopod Strophomena
Fossils of the Devonian plant stem morphogenus Taeniocrada
Restoration showing the top (left) and underside of the Late Ordovician trilobite Triarthrus
Fossil of the Ordovician-Devonian sea star Urasterella
Fossil of the Cambrian trilobite Wanneria
Life restoration of the probable Cambrian mollusc Yochelcionella