Stephanoceratidae
From Wikipedia, the free encyclopedia
| Stephanoceratidae Temporal range: Middle Jurassic–Upper Jurassic | |
|---|---|
 | |
| Stephanoceras blagdeni from Mid Jurassic - Germany | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Superfamily: | †Stephanocerataceae |
| Family: | †Stephanoceratidae |
Stephanoceratidae is a family of planulate and coronate ammonites within the Stephanocerataceae. (Arkell et al 1957) Shells are evolute so that all whorls are exposed and have strong ribbing that bifurcates, that is splits in two, on the flanks. Many have tubercles at the point of bifurcation. Whorl sections are generally subequant; the outer rim, or venter, commonly rounded (ibid)
The Stephanoceratidae are derived from the Otoitidae. Their fossils are found in upper Middle- and lower Upper Jurassic sediments.
References
- Arkell, Kummel, and Wright, 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Mollusca 4.
This article is issued from Wikipedia. The text is available under the Creative Commons Attribution/Share Alike; additional terms may apply for the media files.