Idoceras

{{Short description|Genus of molluscs (fossil)}}

{{Automatic taxobox

| fossil_range = {{fossil range|Oxfordian|Kimmeridgian|ref={{cite journal|last=Sepkoski |first=Jack |title=A compendium of fossil marine animal genera (Cephalopoda entry) | journal=Bulletins of American Paleontology |volume=363 |pages=1–560 | year=2002 | url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class |access-date=2017-10-18 |url-status=dead | archive-url=https://web.archive.org/web/20080507014300/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class | archive-date=2008-05-07 }}}}

| image = Idoceras balderum Exhibit Museum of Natural History.JPG

| taxon = Idoceras

| authority = Burckhardt, 1906

}}

Idoceras is a genus of perisphictacean ammonite, belonging to the Perisphinctidae subfamily Idoceratinae.{{cite web | title= Paleobiology Database - Idoceras | url = https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=15033| access-date = 2017-10-19 }} The genus is known from the Upper Jurassic, with a widespread distribution. Shells of Idoceras are evolute, with a wide umbilicus; ribbing strong, bifurcate high on flanks. Suture simpler than in the similar Ataxioceras.