''Cravevoceras'' is an Upper

Paleozoic The Paleozoic ( , , ; or Palaeozoic) Era is the first of three Era (geology), geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma a ...

ammonite in the goniatite family Cravenoceratidae, probably derived from '' Pachylyroceras'' and contemporary with other cravenoceratid genera like '' Caenolyroceras'', '' Tympanoceras'' and later '' Alaoceras'' and '' Lyrogoniatites''. It is also a member of the

Neoglyphioceratoidea Neoglyphioceratoidea 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 nautiloi ...

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 and subfamily Cravenoceratinae, along with 8 other genera including '' Tympanoceras'' and '' Cravenoceratoides''. D. Korn (2006) and Saunders, Work, and Nikolaeva, 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 of the goniatitacean family

Goniatitidae Goniatitidae is one of three families included in the Ammonoidea, ammonoid cephalopod superfamily Goniatitoidea, known from the Lower Mississippian (geology), Mississippian to the Upper Permian. They have sutures that form 8 lobes and characteris ...

References

* W.M Furnish et al.

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

, Part L (revised) Vo. 2 Paleozoic Ammonoidea, ..

* Miller, Furnish, and Schindewolf, 1957. Paleozoic Ammonoidea, Treatise on Invertebrate Paleontology. * Saunders, Work, and Nikolaeva, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures, Supplementary Material

GONIAT online
Mississippian ammonites Goniatitida genera Ammonites of Europe Mississippian first appearances Pennsylvanian extinctions Pennsylvanian ammonites Paleozoic life of Nunavut Cravenoceratidae {{Goniatitida-stub