Eosomichelinoceras
Eosomichelinoceras is an extinct genus from the actively mobile carnivorous cephalopod family Baltoceratidae that lived in what would be Asia and South America during the Ordovician from 461—452 mya, existing for approximately 9 million years.[1]
| Eosomichelinoceras Temporal range: Ordovician | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Order: | †Orthocerida |
| Family: | †Baltoceratidae |
| Genus: | †Eosomichelinoceras Chen (1974) |
Taxonomy
Eosomichelinoceras was named by Chen (1974)[1] Its type is Eosomichelinoceras huananense. It was assigned to Orthocerida by Chen (1974); and to Baltoceratidae by Kröger et al. (2007).[2]
Morphology
Eosomichelinoceras is a smooth or transversally lirate slender, orthoconic baltoceratid with a narrow, tubular siphuncle,[3] located between the center and the edge of the shell. Connecting rings are thin, septal necks orthochoanitic, and without known endosiphuncular or cameral deposits.
Distribution
Fossils of Eosomichelinoceras have been found in Argentina, China and Iran.[1]
References
- Eosomichelinoceras at Fossilworks.org
- J. Y. Chen. 1974. Ordovician Nautiloidea. A Handbook of the Stratigraphy and Paleontology in Southwest China 138-143
- B. Kröger, M. S. Beresi, and E. Landing. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283
Further reading
- Fossils (Smithsonian Handbooks) by David Ward