Ammonitoceras
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''Ammonitoceras'' is an extinct genus of
cephalopod A cephalopod is any member of the molluscan Taxonomic rank, class Cephalopoda (Greek language, Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral symm ...
belonging to the
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 ...
subclass that lived during the latter part of the Early
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...
in what is now Europe and the transcaspian region. ''Ammonitoceras'' was named by Dumas, 1876, the type-species: ''Ammonitoceras ucetiae''.DUMAS Although the description doesn't mention a hook, as in ''
Ancyloceras ''Ancyloceras'' is an extinct genus of heteromorph ammonites found throughout the world during the Lower Cretaceous, from the Lower Barremian epoch until the genus extinction during the Lower Aptian.Sepkoski, JacSepkoski's Online Genus Database â ...
'' or '' Acrioceras'', ''Ammonitoceras'' is included in the
Ancyloceratidae Ancyloceratidae is a family of heteromorphic Ammonitida, ammonites that lived during the Early Cretaceous. Their shells begin as a loose spiral with whorls not touching which then turns into a straight shaft that ends in a J-shape hook or bend ...
. However neither do '' Australiceras'' or ''
Tropaeum ''Tropaeum'' is an extinct genus of ammonites found throughout the oceans of the world during the Early Cretaceous. As with many other members of the family Ancyloceratidae, there was a trend among species within this genus to uncoil somewhat, ...
'', which are also included.


References

*Arkell et al., 1957. Mesozoic Ammonoidea,
Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...
Part L, Geological Society of America and University of Kansas press. {{Taxonbar, from=Q2843691 Early Cretaceous ammonites of Europe Ancyloceratoidea Ammonitida genera