Zaraiskites
| Zaraiskites Temporal range: middle Jurassic | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Family: | Perisphinctidae |
| Subfamily: | Virgatitinae |
| Genus: | Zaraiskites Semenov, 1898 |
Zaraiskites is an extinct genus of ammonoid cephalopod that lived during the Volgan stage of the Middle Jurassic in what is now the Russian Platform.
Zaraiskites has a ribbed evolute shell without tubercles. Inner whorls are with normal bifurcate or triplicate ribbing; outer whorl is with virgatotome ribbing with as many as seven secondary ribs taking off successively in front of each primary rib.
Related genera in the Virgatitinae include Acuticostites and Virgatites
References
- W.J Arkell, et al., Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, 1957. Geological Society of America and University of Kansas Press.
- V.V. Mitta, 1993. The Systematic Composition of the Middle Volgian Virgatitidae (Ammonoidea) of Central Asia.
Paleontological Journal 27(4).
This article is issued from Wikipedia - version of the Friday, December 18, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.