Eosomichelinoceras
Introduction '''''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 .
Taxonomy ''Eosomichelinoceras'' was named by Chen (1974) Its type is ''Eosomichelinoceras huananense''. It was assigned to ''Orthocerida'' by Chen (1974); and to ''Baltoceratidae'' by Kröger et al. (2007).
Morphology ''Eosomichelinoceras'' is a smooth or transversally lirate slender, orthoconic baltoceratid with a narrow, tubular siphuncle, 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.
References
Further reading * ''Fossils'' (Smithsonian Handbooks) by David Ward