Biology:Ochetoceratinae

Short description: Extinct subfamily of molluscs

Ochetoceratinae Temporal range: 161.2–145.5 Ma PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Superfamily:	Haplocerataceae
Family:	Oppeliidae
Subfamily:	Ochetoceratinae Spath, 1928.
Genera
Ochetoceras, type Canaliculites, Jeannet 1951 Cubaochetoceras Cymaceras Fehlmanites, Jeannet 1951 Oxydiscites

The Ochetoceratinae is a subfamily within the Oppeliidae from the Upper Jurassic, shells of which are typically oxycones with a tricarinate venter and falcoid ribbing, commonly divided by a median lateral groove or fillet. The median (middle) keel is the tallest.

The Ochetoceratinae may be polyphyletic, derived from both the Oppeliidae and Hecticoceratinae as suggested by differences in the included genera.

Description

The median lateral groove is well developed in Ochetoceras and Fehlmanites, less discernible in Cymaceras, but missing or difficult to make out in the other four.

References

• W.J. Arkell, et al. 1957 Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press.
• D.T. Donovan, J.H. Callomon, and M.K. Howarth, 1981. Classification of the Jurassic Ammonitina. The Systematica Association Special Volume no. 18. The Ammonoidea. Academic Press.

Wikidata ☰ Q18355972 entry