Zemistephanus
| Zemistephanus Temporal range: Jurassic
| |
|---|---|
| Scientific classification | |
| Kingdom: | |
| Phylum: | Mollusca |
| Class: | |
| Subclass: | |
| Genus: | Zemistephanus McLearn, 1927
|
Zemistephanus is an extinct
ammonite genus from the middle Jurassic of western North America and Western Australia, named by McLearn 1927. Zemistephanus is included in the stephanoceratoid family Otoitidae, which are characterized by shells that begin as barrel-shaped cadicones but which become planulate later in life. Body chambers are reduced in size and are excentric. Similar genera are Pseudotoites and Emileia
References
 | This article includes a improve this article by introducing more precise citations. (October 2013) ) |
- Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
 | This ammonite-related article is a stub. You can help Wikipedia by expanding it. |