List of the Paleozoic life of Oklahoma

This list of the Paleozoic life of Oklahoma contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Oklahoma and are between 541 and 252.17 million years of age.

Illustration of a fossilized skull in multiple views of the Permian primitive reptile Acleistorhinus
Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris
Fossil of the Carboniferous horsetail relative Annularia
Fossilized shell and spines of the Late Devonian-Permian sea urchin Archaeocidaris
Fossils of the Carboniferous-Permian bryozoan Archimedes
Fossilized shell of the Late Ordovician-Carboniferous brachiopod Atrypa
Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten
Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon
Illustration of a fossilized skull of the Permian primitive reptile Bolosaurus
Life restoration of the Permian amphibian Cacops
Fossilized stems from the Carboniferous-Permian horsetail relative Calamites
Fossil of the Early Ordovician-Early Devonian trilobite Calymene
Fossilized skeletons of the Permian reptile Captorhinus
Life restoration of the Permian amphibian Cardiocephalus
Fossil of the Middle-Late Ordovician trilobite Ceraurus
Fossil of the Cambrian-Middle Devonian trilobite Cheirurus
Fossil of the Carboniferous tabulate coral Cladochonus
Fossilized shell of the Middle Devonian-Permian brachiopod Cleiothyridina
Illustration of a fossilized cranium of the Permian primitive reptile Colobomycter
Mounted fossilized skeleton of the Permian synapsid (mammal precursor) Cotylorhynchus
Illustration of a fossilized skull and ventral scutes of the Carboniferous-Permian reptile relative Cricotus . Edward Drinker Cope (1884).
Fossil of the Carboniferous shark Ctenacanthus
Fossilized foliage from the Carboniferous seed fern Cyclopteris
Fossil of the Late Ordovician-Late Devonian trilobite Cyphaspis
Fossil of the Late Ordovician-Middle Devonian trilobite Dalmanites
Interpretive diagrams and fossils of a skull of the Permian primitive reptile Delorhynchus
Fossilized skeleton of the Permian reptile relative Diadectes
Dicranurus
Life restoration of the Permian synapsid (mammal precursor) Dimetrodon
Fossilized axial skeleton of the Carboniferous-Permian amphibian Diplocaulus
Fossil of the Early-Middle Ordovician cystoid echinoderm Echinosphaerites
Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Edaphosaurus
Life restoration of the Carboniferous-Permian amphibian Eryops
Fossilized holdfast of the Silurian-Middle Devonian crinoid ("sea lily") Eucalyptocrinites
Fossilized skull in multiple views of the Permian primitive reptile Feeserpeton
Fossil in an enrolled posture of the Late Ordovician trilobite Frencrinuroides
Life restoration of the Permian lungfish Gnathorhiza
Fossilized shell of the Late Devonian-Late Triassic ammonoid cephalopod Goniatites
Fossils of the Carboniferous coral Gymnophyllum , also known as button coral
Fossil of the Ordovician bryozoan ("moss animal") Hallopora
Fossilized shells of the Ordovician-Carboniferous sea snail Holopea
Fossil of the Early Devonian trilobite Huntoniatonia
Fossil of the Middle Ordovician trilobite Illaenus
Fossil of the Middle-Late Ordovician giant trilobite Isotelus .
Fossils of the Early Devonian trilobite Kainops
Life restoration of the Permian reptile Labidosaurus
Fossil of the Late Ordovician-Middle Devonian trilobite Leonaspis
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 amphibian Llistrofus
Life restoration of the Permian snake-like amphibian Lysorophus showing speculative egg-coiling behavior
Life restoration of the Permian primitive reptile Macroleter
Illustration (lower right, entry 15) of a fossilized shell in front and side views of the Silurian-Late Devonian brachiopod Meristella
Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras
Life restoration of the Permian amphibian Micraroter
Fossils of the Early Devonian graptolite Monograptus
Life restoration of the Permian synapsid (mammal precursor) Mycterosaurus
Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis
Fronds of the Carboniferous seed fern Neuropteris
Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula
Fossil of the Silurian-Devonian trilobite Odontochile
Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon
Life restoration of the Carboniferous-Permian freshwater shark Orthacanthus
Fossil of the trilobite Paciphacops
Fossils of the Late Devonian-Permian fern-like fronds Pecopteris
Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites
Fossilized tooth of the Carboniferous-Permian shark Petalodus
Light micrograph of a Pinnularia alga
Fossilized shell of the Ordovician brachiopod Plaesiomys
Three fossilized calyces of the Devonian-Permian crinoid ("sea lily") Platycrinites
Life restoration of the Carboniferous-Permian bony fish Platysomus
Fossil of the Late Ordovician cystoid echinoderm Pleurocystites
Restoration of the Silurian trilobite Proetus
Life restoration of the Permian amphibian Rhynchonkos
Fossil of the barnacle boring ichnogenus Rogerella
Fossilized calyx of the Carboniferous crinoid ("sea lily") Scytalocrinus
Fossilized skeleton of the Permian primitive four-limbed animal Seymouria
Fossilized stump of the Carboniferous-Permian club moss relative Sigillaria
Fossilized shells of the marine bivalve Solecurtus
Fossil of the Middle Ordovician-Silurian trilobite Sphaerexochus
Fossilized leaves and branches of the Devonian-Triassic horsetail relative Sphenophyllum
Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer
Fossilized shell of the Ordovician-Silurian brachiopod Strophomena
Fossilized shell of the Early Ordovician-Late Devonian probable mollusc Tentaculites
Fossilized shell of the Carboniferous-modern foraminiferan Textularia
Fossilized skull of the Permian amphibian Trimerorhachis
Fossil of the Ordovician-Devonian sea star Urasterella
Varanodon
Fossilized foliage of the Carboniferous-Permian conifer Walchia
Restoration of the Late Devonian–Triassic freshwater shark Xenacanthus
Life restoration of the Permian amphibian Zatrachys