Cochlioceras

Cochlioceras; Temporal range: 478 – 464 Ma Upper Lower to Lower Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	†Orthocerida
Family:	†Baltoceratidae
Genus:	†Cochlioceras; Eichwald (1860)

Cochlioceras is an extinct baltoceratid genus from the lower and middle Ordovician (Arenig - Llanvrin) of what are now Europe, the U.S (Vermont), and China, having existed for approximately 14 million years, from about 478 to 464 mya.[1]

Taxonomy

Cochlioceras was named by Eichwald (1860). Its type is Cochlioceras avus. It was assigned to the Baltoceratidae by Furtnish and Glensiter in Teichert et al. (1964) [1] and removed, with the Baltoceratidae, from the Ellesmerocerida to the Orthocerida by Kroger et al. (2007)[2]

References

Teichert et al 1964, Treatise on Invertebrate Paleontology Part K; Nautiloidea - Ellesmerocerida by W.M. Furnish and Brian F. Glenister, pp K129 -K160.
Kroger, B. (2007). "Early orthoceratoid cephalopods from the Argentine Precordillera". Journal of Paleontology. 81 (6): 1266–1283. doi:10.1666/06-013.1.

PaleoBiology Database: Cochlioceras, basic info
Fossils (Smithsonian Handbooks) by David Ward

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[Teichert-1] Teichert et al 1964, Treatise on Invertebrate Paleontology Part K; Nautiloidea - Ellesmerocerida by W.M. Furnish and Brian F. Glenister, pp K129 -K160.

[2] Kroger, B. (2007). "Early orthoceratoid cephalopods from the Argentine Precordillera". Journal of Paleontology. 81 (6): 1266–1283. doi:10.1666/06-013.1.