Procymatoceras
| Procymatoceras Temporal range: Middle Jurassic
| |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | †Cymatoceratidae |
| Genus: | †Procymatoceras Spath, 1927 |
Procymatoceras is a nautiloid cephalopod from the Middle Jurassic with a large, tightly involute, rapidly expanding shell. Early, inner, whorls are round in cross section. Later, outer, whorls, and mature living chamber are flattened on the sides and venter. Surface covered with sinuous ribs. Sutures have shallow ventral and dorsal lobes. Probably gave rise to Nautilidae, in Cenoceras.
References
- Bernhard Kümmel, 1964. Nautiloidea - Nautilida. Treatise on iInvertebrate Paleontology Part K. Geol. Soc. of America and Univ. Kans. Press, Teichert & Moore (eds)