Zetoceras
| Zetoceras Temporal range:
| |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Phylloceratidae |
| Subfamily: | †Phylloceratinae |
| Genus: | †Zetoceras Kovacs, 1939 |
Zetoceras is an extinct
suborder Phylloceratina that lived during the Early and Middle Jurassic in what is now Europe, and is included in the (family) Phylloceratidae.[1]
Zetoceras has a compressed involute shell with a very small umbilicus. The suture is phylloid, as for the suborder, with tall primary sutural elements. Saddles commonly have tetraphyllic endings.[1] Zetoceras is considered by some (Wright et al, 1996) to be a subgenus of Phylloceras. The two are very similar except that the saddle endings in Phylloceras split in three rather than in four as in Zetoceras.
References
- Wright, Calloman, and Howarth. 1996; Cretaceous Ammonoidea. Treatise on Invertebrate Paleontology L(4)
- The Paleobiology Database Zetoceras entry
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