Permoceras
From Wikipedia, the free encyclopedia
| 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) | |
Permoceras is a fossil genus of coiled nautiloids that lived during the Kungurian.[1]
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.
