Hipparionoceras
| Hipparionoceras Temporal range: Middle Devonian | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Oncocerida |
| Family: | Polyelasmoceratidae |
| Genus: | Hipparionoceras Flower 1945 |
Hipparionoceras is an oncocerid genus from the middle Devonian of Europe, North America, and China that lived around 395 million years ago.
The shell of Hipparionoceras is curved, rapidly expanding, flared toward the aperture. The curvature is endogastric with the ventral side somewhat concave in profile. The siphuncle is subventral, empty, with segments expanded into the short but broad chambers. Septa are close spaced, their curvature shallow.
Polyelasmoceras and Macrodomoceras are related genera, also from the Middle Devonian. Cadoceras from the Middle Silurian may be ancestral.
References
- Walter C. Sweet, 1964. Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontilogy, Part K. Geological Society of America.
- Hipparionoceras in Fossilworks Gateway
This article is issued from Wikipedia - version of the 9/26/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.