Permoceras
Genus of coiled nautiloids
From Wikipedia, the free encyclopedia
Permoceras is a fossil genus of coiled nautiloids that lived during the Kungurian.[1]
| Permoceras Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | †Permoceratidae |
| Genus: | †Permoceras Miller and Collinson, 1953 |
| Species: | |
| Binomial name | |
| †Permoceras bitauniensis[3] (Haniel, 1915) | |
Discovery
Permoceras was first identified in the Lower Permian of Timor in the East Indies and named by Miller and Collinson in 1953.
Description
Permoceras has a smooth, compressed, involute shell; whorls higher than wide; earlier whorls hidden from view. The venter is rounded as are the ventral and umbilical shoulders; the flanks flattened. The siphuncle is ventrally subcentral. The suture, which is most characteristic, has a deep, narrow pointed ventral lobe and large, asymmetrical pointed lobes on either side.
The coiling and whorl structure of Permoceras almost precisely resembles those of Pseudonautilus from the Upper Jurassic.
Taxonomy
Permoceras is the sister genus of Foveroceras, and the two are included in the family Permoceratidae, which is a member of the monotypic superfamily Permoceratoidea.[4][5]
