Cravevoceras is an Upper Paleozoic

Paleozoic

The Paleozoic era is the earliest of three geologic eras of the Phanerozoic eon, spanning from roughly...

 ammonite in the gonititid family Cravenoceratidae

Cravenoceratidae

The Cravenoceratidae is one of six families included in the ammonoid superfamily Neoglyphiocerataceae, which lived during the latter part of the Paleozoic era....

, probably derived from Pachylyroceras

Pachylyroceras

Pachylyroceras is a large, generally subglobular, Upper Mississippian gonitite and included in the cephalopod subclass Ammonoidea.-Recognition:...

and contemporaty with other cravenoceratid genera like Caenolyroceras, Tympanoceras and later Alaoceras

Alaoceras

Alaoceras is an ammonoid cephalopod from the upper Paleozoic included in the goniatitid family Cravenoceratidae, named by Ruzhentsev & Bogoslovskaya in 1971....

and Lyrogoniatites

Lyrogoniatites

Lyrogoniatitites is a neoglyphiocercean ammonite, in the order Goniatitida, related to genera like Alaoceras, Cravenoceras, Dumbarigloria and Pachylyroceras.-Description:...

. Is is also a member of the Neoglyphiocerataceae

Neoglyphiocerataceae

Neoglyphiocerataceae is one of seventeen superfamilies of the Goniatitina suborder. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopodes, and cuttlefish, and more distantly to the nautiloids....

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Description

The shell of Cravenoceras is thickly discoidal to globose and moderately to widely umbilicate. Young stages are mostly extremely evolute. Sculpture consists of transverse lamellae, which are more or less straight on the flanks, but form a shallow ventral sinus. Longitudinal lirae mostly absent or very faint, sometimes restricted to umbilical shoulder. Constrictions are weak or absent. The ventral lobe is narrow, with a relatively low median saddle.

Taxonomic position

The revised Treatise (Furnish et al 2009) includes Cravenoceras in the family Cravenoceratidae

Cravenoceratidae

The Cravenoceratidae is one of six families included in the ammonoid superfamily Neoglyphiocerataceae, which lived during the latter part of the Paleozoic era....

and subfamily Cravenoceratinae

Cravenoceratinae

Cravenoceratinae is one of two subfamilies of the Cravenoceratidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.-References:...

, along with 8 other genera including Tympanoceras and Cravenoceratoides. D.Korn (2006) and Saunders, Work, and Nickoleava,1999, along with GONIAT online give the same or a similar perspective. The older Treatise, Part L, 1957 (Miller, Furnish, and Schindewolf) on the other hand put Cravenoceras in the subfamily Goniatitinae

Goniatitinae

Goniatitinae is one of two subfamilies of the Goniatitaceae superfamilies. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.-References:...

 of the Goniatitacean family Goniatitidae

Goniatitidae

Goniatitidae is one of three families of the Goniatitaceae superfamilies. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.-References:...

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