Harman Patil (Editor)

Crioceratidae

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Kingdom  Animalia
Class  Cephalopoda
Order  Ammonitida
Rank  Family
Phylum  Mollusca
Subclass  Ammonoidea
Superfamily  Ancyloceratoidea
People also search for  Ancyloceratidae, Ancyloceratoidea, Crioceras, Crioceratites, Ancyloceratina

The Crioceratidae constitute a family of loosely to closely coiled Ammonitida included in the Ancyloceratoidea that lived during the Early Cretaceous; characterized by Crioceratites and other genera such as Hoplocrioceras and Paracrioceras.

The Crioceratidae are gyroconic, coiled in a plane, generally with space between the whorls although in some like Balearites the whorls are barely in contact.

Although distinct in character and not truly heteromorphic the Crioceratidae were included in the American TreatisePart L, 1957, in the Ancyloceratidae as the subfamily Crioceratinae. It is now considered a distinct family as originally proposed by Wright 1952 with the Acrioceratidae, proposed by Vermeulen (2004), a transition between the two.

Other genera in the Crioceratidae include Aegocrioceras, Menutheocrioceras, and Shasticrioceras.

References

Crioceratidae Wikipedia


Similar Topics
Ancyloceratidae
Ancyloceratina
Crioceratites
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