Temporal range: 478 – 464Ma Upper Lower to Lower Middle Ordovician
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. 
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)  and removed, with the Baltoceratidae, from the Ellesmerocerida to the Orthocerida by Kroger et al. (2007)
- 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 Palaeontology 81 (6): 1266–1283. doi:10.1666/06-013.1.
- PaleoBiology Database: Cochlioceras, basic info
- Fossils (Smithsonian Handbooks) by David Ward