page_title: List of the prehistoric life of Iowa
section_title: Selected Paleozoic taxa of Iowa
hierarchical_section_title: List of the prehistoric life of Iowa / Paleozoic / Selected Paleozoic taxa of Iowa
caption_attribution_description: English: Onychodus, primitive sarcopterygian from Middle DevonianРусский: Onychodus, примитивная среднедевонская лопастепёрая рыба
context_page_description: This list of the prehistoric life of Iowa contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Iowa.
context_section_description: †Acidaspis
   †Actinocrinites
  †Actinocrinites gibsoni
  †Actinocrinites lowei
  †Agassizodus
  †Agassizodus variabilis
  †Aglaocrinus
  †Amplexus
  †Anataphrus
  †Anomphalus
  †Archaeogastropod
  †Arctinurus
  †Athyris
  †Athyris fultonensis – or unidentified comparable form
   †Atrypa
  †Atrypa reticularis
  †Atrypa reticularus
  †Aviculopecten
  †Bellerophon
  †Bembexia
  †Bothriocidaris
  †Bumastus
  †Calymene
  †Camarotoechia
  †Camarotoechia chouteauensis
  †Camarotoechia tuta
  †Cardiola
  †Catenipora
  †Ceratocephala
  †Ceratopsis
  †Ceraurus
  †Charactoceras
   †Cheirurus
  †Chomatodus
  †Chomatodus inconstans
  †Chonetes
  †Chonetes glenparkensis
  †Chonetes illinoisensis
  †Chonetes logani
  †Chonetes multicosta
  †Chonetes ornatus
  †Cleiothyridina
  †Cleiothyridina incrassata – or unidentified comparable form
  †Cleiothyridina sublamellosa
  †Climacograptus
  †Coenites
   †Composita
  †Composita humilis – tentative report
  †Composita trinuclea
  †Conocardium
  †Coolinia
  †Cornulites
  †Crania
  †Crotalocrinites
  †Curtognathus
  †Cyathocrinites
  †Cyclonema
  †Cyphaspis
  †Cypricardinia
  †Cyrtolites
   †Cyrtospirifer
  †Cyrtospirifer whitneyi
  †Cystodictya
  †Dalmanites
  †Decadocrinus
  †Deiphon
  †Deltaherpeton – type locality for genus
  †Dentalium
  †Dicoelosia
  †Dimerocrinites
  †Diplograptus
  †Diplograptus modestus – or unidentified comparable form
  †Discosorus
  †Earlandia
   †Edestus
  †Edmondia
  †Eldredgeops
  †Eldredgeops rana
  †Ellesmeroceras
  †Encrinurus
  †Endoceras
  Eocaudina
  †Eodictyonella
  †Eophacops
  †Eospirifer
  †Eospirifer radiatus
  †Eucalyptocrinites
  †Euomphalus
  †Favosites
  †Fenestella
   †Flexicalymene
  †Goniatites
  †Gravicalymene
  †Greenops
  †Grewingkia
  †Gyroceras
  †Hallopora
  †Halysites
  †Harpidium
  †Heliophyllum
  †Hexagonaria
  †Hindia
  †Holopea
  †Huronia
  †Hyolithes
  †Icriodus
  †Idiognathodus
   †Iniopteryx
  †Iniopteryx rushlaui
  †Iocrinus
  †Isotelus
  †Kayoceras
  †Kionoceras
  †Krausella
  †Leptopora
  †Lingula
  †Manticoceras
  †Marsupiocrinus
   †Meristella
  †Meristina
  †Michelia
  †Michelinoceras
  †Murchisonia
  †Mycterops
  †Mystrocephala
  †Naticopsis
  †Naticopsis depressa – type locality for species
  †Neospirifer
  Nucula
  †Odontopleura
   †Onychodus
  †Orthoceras
  †Oulodus
  †Ozarkodina
  †Pachyphyllum
  †Paladin
  †Palmatolepis
  †Peachocaris
  †Pentamerus
  †Pentremites
  †Periechocrinus
   †Petalodus
  †Phacops
  †Phillipsia
  †Pinnocaris
  †Plaesiomys
  †Platyceras
  †Platycrinites
  †Platystrophia
  †Plectodonta
  †Pleurocystites
  Pleurotomaria – tentative report
  †Plicochonetes
  †Poleumita
  †Polygnathus
  †Polygnathus parawebbi
  †Polygnathus xylus
  †Posidonia
  †Proetus
   †Ptyctodus
  †Rhynchodus
  †Rigidella
  †Scutellum
  †Scytalocrinus
  †Septemchiton
  †Sigournea – type locality for genus
  †Sigournea multidentata – type locality for species
  †Similodonta
  †Skenidioides – tentative report
  †Sowerbyella
  †Sphenothallus
  †Spirifer
  †Spirifer louisianensis
  †Spiriferina
  Spirorbis
  †Spyroceras
   †Stethacanthus
  †Streptognathodus
  †Strophomena
  †Strophomena costata
  †Strophomena erratica
  †Stylonema – tentative report
  †Syringopora
  †Taxocrinus
  †Tranodis
  †Whatcheeria – type locality for genus
  †Worthenia
  †Youngia
caption: Life restoration of the Middle-Late Devonian lobe-finned fish Onychodus
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