Cymatoceras
| Cymatoceras Temporal range: U Jurassic - Oligocene [1][2] | |
|---|---|
 | |
| Cymatoceras species from Albian of Madagascar | |
| Scientific classification | |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Superfamily: | Nautilaceae |
| Family: | Cymatoceratidae |
| Genus: | Cymatoceras Hyatt, 1884 |
Cymatoceras is a wide ranging extinct genus from the nautilitacean cephalopod family, Cymatoceratidae.
Selected species
- Cymatoceras elegans
- Cymatoceras pseudoatlas
- Cymatoceras pseudoelegans
- Cymatoceras pseudoneokomiense
Fossil record
Fossils of Cymatoceras are found in marine strata from the Jurassic until the Oligocene (age range: from 155.7 to 28.4 million years ago.). Fossils are known from several localities in Europe, Japan, India, Antarctica, Greenland, North America, South America, Asia, Africa and Madagascar. [1]
Description
Its shell is generally subglobular, variably involute with a rounded whorl section. Sides and venter bear conspicuous ribs. The suture is only slightly sinuous and the siphuncle position is variable. [3]
Paracymatoceras, coeval during the Late Jurassic and Early Cretaceous differs primarily in having a more sinuous suture. Neocymatoceras tsukushiense from the Oligocene of Japan, described by Kobayashi, 1954, is a variant of Cymatoceras. [3]
References
- 1 2 3 Fossilworks
- ↑ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
- 1 2 Bernhard Kummel, 1964. Nautiloidea - Nautilida. Treatise on Invertebrate Paleontology Part K. Geol Soc of America and Univ Kans Press, Teichert & Moore (eds)