''Ammonitoceras'' is an extinct genus of cephalopod belonging to the ammonite subclass that lived during the latter part of the Early

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

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 The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ...

'' or '' Acrioceras'', ''Ammonitoceras'' is included in the Ancyloceratidae. 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'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

Part L, Geological Society of America and University of Kansas press. {{Taxonbar, from=Q2843691 Early Cretaceous ammonites of Europe Ancyloceratoidea Ammonitida genera