''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