Crioceras

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].

References[]

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

changed taxonomy, added description

[1] Crioceras in PaleoDB [1]

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

[1]

[2]