This list of the prehistoric life of Illinois contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Illinois.
Precambrian The Paleobiology Database records no known occurrences of Precambrian fossils in Illinois.
Paleozoic
Selected Paleozoic taxa of Illinois †Achatella †Actinoceras †Alethopteris †Alethopteris decurrens †Alethopteris lonchitica †Alethopteris owenii †Alethopteris serlii †Amphibamus – type locality for genus †Amphibamus grandiceps – type locality for species †Amphiscapha †Amynilyspes – type locality for genus †Annularia †Annularia asteris – or unidentified comparable form †Annularia stellata †Anomphalus – type locality for genus †Anthracoceras †Archaeocidaris – tentative report †Archaeopteris †Archimedes †Archimedes communis †Archimedes compactus †Archimedes invaginatus †Archimedes lativolvis †Archimedes macfarlani †Archimedes swallovanus †Archimedes terebriformis †Archimylacris †Arctinurus †Arthrolycosa – type locality for genus †Artisia †Asterotheca †Asterotheca miltoni – or unidentified comparable form †Asyncritus – type locality for genus †Athyris †Atrypa †Atrypa reticularis – report made of unidentified related form or using admittedly obsolete nomenclature †Aviculopecten †Aviculopecten fasciculatus † Avonia †Bandringa – type locality for genus †Bassleroceras †Bellerophon †Bellerophon spergensis †Belinurus †Bembexia †Blattoidea †Brachydectes †Brachydectes newberryi †Bumastus †Bumastus armatus – or unidentified comparable form †Bumastus chicagoensis †Bumastus cuniculus – or unidentified comparable form †Bumastus graftonensis †Bumastus insignis †Bumastus springfieldensis †Bumastus transversalis †Calamites †Calamites suckowii †Callipteridium †Calvinia †Calymene †Calymene breviceps †Calymene celebra †Calyptaulax †Camarotoechia †Caseodus †Cephalerpeton – type locality for genus †Cephalerpeton ventriarmatum – type locality for species †Ceratiocaris †Ceratocephala †Ceraurinella †Ceraurinus †Ceraurus †Cheirurus †Chonetes †Chonetes ornatus †Cleiothyridina †Cleiothyridina atrypoides †Cleiothyridina sublamellosa †Clepsydrops – type locality for genus †Cliftonia †Coelacanthus †Composita †Composita subtilita †Composita trinuclea †Conocardium †Cooperoceras †Cordaicarpus †Cordaites †Cordaites principalis †Cornulites †Crania †Craniops †Cricotus – type locality for genus †Crotalocrinites †Ctenacanthus †Ctenacanthus buttersi – type locality for species †Curriella – tentative report †Cyathocrinites †Cyclonema †Cyclus †Cyphaspis †Cyrtoceras †Dalmanites †Deiphon †Dicoelosia †Dictyonema †Dimerocrinites †Dimerocrinites occidentalis †Diplocaulus – type locality for genus †Domatoceras †Echinaria †Edestus †Edmondia †Elonichthys †Encrinurus †Eodictyonella †Eophacops †Eophacops handwerki †Eospirifer †Eospirifer radiatus †Erratencrinurus †Eucalyptocrinites †Eucalyptocrinites crassus †Euomphalus †Euomphalus planodorsatus †Euphoberia – type locality for genus †Euphoberia armigera – type locality for species †Favosites †Fenestella †Fletcheria †Gerarus – type locality for genus †Glikmanius †Glikmanius occidentalis †Glyptambon †Glyptopleura †Gondolella †Graeophonus †Graeophonus scudderi – type locality for species †Greenops †Greererpeton †Hallopora – tentative report †Halysites †Harpidium †Helenodora – type locality for genus †Helenodora inopinata – type locality for species †Heliomeroides †Holia †Hyolithes †Ilyodes †Isodectes †Isotelus †Isotelus gigas †Isotelus maximus †Kionoceras †Latzelia – type locality for genus †Latzelia primordialis – type locality for species †Lepidodendron †Lepidodendron aculeatum †Lepidophyllum †Lepidostrobus †Lichas †Lingula †Liroceras Lithophaga – tentative report †Lysorophus – type locality for genus †Marsupiocrinus †Meristina †Metacoceras †Milosaurus – type locality for genus †Monograptus †Monograptus dubius †Murchisonia †Naticopsis †Naticopsis carleyana †Naticopsis planifrons †Naticopsis waterlooensis – type locality for species †Nemastomoides – type locality for genus †Neospirifer †Neospirifer dunbari †Neospirifer triplicatus †Neuropteris †Neuropteris ovata †Neuropteris rarinervis †Neuropteris scheuchzeri †Neuropteris tenuifolia †Nodonema Nucula †Nuculoidea – tentative report †Onychopterella – tentative report †Palenarthrus – type locality for genus †Palenarthrus impressus – type locality for species †Paraisobuthus †Pecopteris †Pecopteris plumosa †Pentremites †Pentremites tulipaformis †Periechocrinus †Phacops †Phlegethontia †Phlegethontia longissima – type locality for species †Phragmolites †Platyceras †Platysomus †Platystrophia †Plicochonetes †Polysentor – type locality for genus †Priapulites – type locality for genus †Priapulites konecniorum – type locality for species †Prodentalium †Proetus †Protophasma †Protopilio †Pseudophlegethontia – type locality for genus †Pseudophlegethontia turnbullorum – type locality for species †Pterochiton †Pterotheca †Rasstriga – type locality for genus †Rasstriga americana – type locality for species †Remopleurides †Rhodea †Rhynchonella †Saccoglossus †Sagenodus †Samaropsis †Savagella †Scepasma – type locality for genus †Sigillaria †Silphion – type locality for genus † Simplicius †Skenidioides Solemya †Solenochilus †Sphaerexochus †Sphaerocoryphe †Sphenophyllum †Sphenophyllum cuneifolium †Sphenophyllum emarginatum †Sphenophyllum longifolium – or unidentified comparable form †Sphenopteris †Stearoceras †Stethacanthus †Stethacanthus altonensis †Stigmaria †Strophomena †Symmorium – type locality for genus †Syringopora †Tainoceras †Tentaculites †Tranodis †Tullimonstrum – type locality for genus †Wilkingia †Worthenia †Xyloiulus Yoldia
Mesozoic The Paleobiology Database records no known occurrences of Mesozoic fossils in Illinois.
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