Mongoceras
| Mongoceras Temporal range: 443.7–428.2 Ma | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Orthocerida |
| Superfamily: | Orthocerataceae |
| Genus: | Mongoceras |
Mongoceras is an extinct orthoconic nautiloid cephalopod found in the Silurian of China and Siberia.[1] It is included in the Orthocerida.[2] The family in undetermined.
Morphology
As with the Orthocerida the shell of Mongoceras is generally long and straight, with a generally central siphuncle composed of thin connecting rings. A vertical, heads down orientation in life can be inferred, in contrast with the horizontal benthic orientation of ellesmerocerida, endocerids, and many actinocerids with their weighted ventral siphuncles.[3]
Association
Mongoceras has been found with Kionoceras, Geisonocers, and Sichuanoceras in Silurian reefoid formations in China, along with a suite of other benthic invertebrates. It has also been found in core samples from Siberia with Edenoceras hiliferum and Geisonoceras kureikense.[3]
References
- ↑ PaleoBiology Database Mongocerasentry accessed 10 July 2012
- ↑ Sepkoski's list of Cephalopod genera
- 1 2 C. Teichert (1964). R.C. Moore, ed. Part K, Mollusca 3. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. K190–K216.