''Alocolytoceras'' is a
lytoceratid ammonite
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...
with whorls that pass during growth from round to oval, rounded-quadrate, or compressed; with about 19 deep constrictions per whorl, with as many as 21 sharp ribs in between. The shell is evolute. All whorls are visible from either side.
''Alocolytoceras'' belongs to the lytoceratid subfamily Alocolytoceratinae, which also includes ''
Pachylytoceras'' and ''
Pleurolytoceras''. It is known from the upper Lower Jurassic of Europe and the Himalaya.
References
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Jurassic ammonites
Early Jurassic ammonites of Europe
Ammonitida genera
Lytoceratidae
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