Xainzanoceras
| Xainzanoceras | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Tarphycerida |
| Family: | Lituitidae |
| Genus: | Xainzanoceras Chen, 1987 |
Xainzanoceras, defined by Chen, 1987, is a nautiloid cephalopod from the Upper Ordovician of China, assigned to the tarphyceratid family Lituitidae. The type, Xainzanoceras xizangense Chen resembles the ophidioceratid genus Ophioceras. The shell is evolute, discoidal, serpenticonic; whorl section rounded, covered with thick, straight, close spaced, radial ribs that curve slightly forward at the ventral margin where they become quickly reduced or lost.
References
- Chen Ting Yan, 1987. Ordovician Nautilus Xainza: Nanjing Institute of Geology and Paleontology Series 11:133-191,1987.
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