Devonosteus

{{Short description|Extinct genus of fishes}}

{{Italic title}}

{{Speciesbox

| fossil_range = {{fossilrange|379.5|376.1|Late Frasnian}}

| image =

| image_caption =

| taxon = Devonosteus proteus

| parent_authority = Jaekel, 1927

| authority = Jaekel, 1927

}}

Devonosteus is an extinct genus of prehistoric marine lobe-finned fish known from the Late Devonian.{{Cite web |title=PBDB Taxon |url=https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=txn:34914 |access-date=2024-08-12 |website=paleobiodb.org}} It contains a single species, D. proteus from the late Frasnian of Wildungen, Germany.{{Cite web |title=PBDB |url=https://paleobiodb.org/classic/displaySearchStrataResults?group_formation_member=Kellwasserkalk |access-date=2024-08-12 |website=paleobiodb.org}}{{Cite journal |last=Cloutier |first=Richard |last2=Lelievre |first2=Hervé |date=January 1998 |title=Comparative study of the fossiliferous sites of the Devonian |url=https://www.researchgate.net/publication/213770161_Comparative_study_of_the_fossiliferous_sites_of_the_Devonian |journal=Ministère de l'Environnement et de la Faune, Gouv Québec}} It has sometimes been considered a lungfish of the family Holodontidae, but this remains uncertain as the original specimen may be lost.{{Cite journal |last=Campbell |first=K. S. W. |last2=Barwick |first2=R. E. |date=1986 |title=Paleozoic lungfishes?a review |url=https://onlinelibrary.wiley.com/doi/10.1002/jmor.1051900409 |journal=Journal of Morphology |language=en |volume=190 |issue=S1 |pages=93–131 |doi=10.1002/jmor.1051900409 |issn=0362-2525}}{{Cite journal |last=Long |first=John |date=2010 |title=New holodontid lungfishes from the Upper Devonian Gogo Formation of Western Australia |url=https://www.academia.edu/1030050/New_holodontid_lungfishes_from_the_Upper_Devonian_Gogo_Formation_of_Western_Australia |journal=Morphology, Phylogeny and Paleobiogeography of Fossil Fishes}} Alternatively, it may be a tristichopterid, a type of basal tetrapodomorph.{{Cite journal |last=Cloutier |first=Richard |date=1996 |title=Taxonomic review of Eusthenopteron foordi Whiteaves |url=https://www.researchgate.net/publication/259334370_Taxonomic_review_of_Eusthenopteron_foordi_Whiteaves |journal=Devonian Fishes and Plants of Miguasha, Quebec, Canada}}