Idoceras
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''Idoceras'' is a genus of perisphictacean
ammonite Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
, belonging to the Perisphinctidae subfamily Idoceratinae. 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''.


References

* Jurassic ammonites Ammonitida genera Perisphinctidae Ammonites of Europe {{ammonitina-stub