Eosomichelinoceras
| Eosomichelinoceras Temporal range: Ordovician | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Order: | †Orthocerida |
| Family: | †Baltoceratidae |
| Genus: | †Eosomichelinoceras Chen (1974) |
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 468—449 mya, existing for approximately 19 million years.
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 orthochoantic, and without known endosiphuncular or cameral deposits.
References
- ↑ PaleoBiology Database: Eosomichelinoceras, basic info
- ↑ 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
- Fossils (Smithsonian Handbooks) by David Ward
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