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Crioceras
Fossil range: Lower Cretaceous
Scientific classification

Phylum

Mollusca

Class

Cephalopoda

Subclass

Ammonoidea

Order

Ammonitida

Family

Crioceratidae

Genus

Crioceras



Crioceras ("Ram's horn") is an extinct of cephalopod genus from the Lower Cretaceous included in the family Crioceratidae.[1] The shell is openly coiled in a planar spiral, whorls not in contact; Whorl section oval to subquatdrate. Ribbing is dense with periodic stronger ribs that may bear ventrolateral and/or umbilcal spines. The suture is ammonitic, jagged in appearence. Although called a heteromorph, other than being related to truer heteromorphs such as Ancyloceras, it isn't morphologically since it involves only one form.


Crioceras ramoseptum comes from the Aptian of Dagestan[2].


ReferencesEdit

  1. ^ Crioceras in PaleoDB [1]
  2. ^ Lehmann, U. 1981. The ammonites: Their life and their world. London: Cambridge University Press.

changed taxonomy, added description

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