Kingdom Animalia Rank Genus Subclass Nautiloid | Phylum Mollusca Order Oncocerida | |
Similar Nautiloid, Oncocerida, Kionoceras, Geisonoceras, Gomphoceras | ||
Oncoceras is a genus of oncocerids, family Oncoceratidae from the middle and upper Ordovician of North America and Europe.
The shell, or conch, of Oncoceras is relatively short, a curved, compressed brevicone with a maximum width in the phragmocone just behind the body chamber, narrowing toward the aperture. The siphuncle is small, necks recurved.
References
Oncoceras Wikipedia(Text) CC BY-SA