Bickmorites
| Bickmorites Temporal range: Late Ordovician -Mid Silurian | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Order: | †Tarphycerida |
| Family: | †Barrandeoceratidae |
| Genus: | †Bickmorites Foerste 1925 |
| Species | |
| |
Bickmorites is an extinct nautiloid cephalopod genus known from the upper Ordovician to the middle Silurian of North America and northern Europe (Norway).
Bickmorites has a gyroconic shell, coiled such that whorls are not in contact, although close. The surface is strongly ribbed; ribs slant dorso-ventrally toward the apex. The siphuncle is narrow, located slightly ventral of the center. Septal necks are straight, making the siphuncle orthochoanitic.
Bickmorites seems to bridge the temporal gap between the Upper Ordovivian barrandeoceratid Antiplectoceras and the Middle Silurian barrandoeceratids Gasconsoceras, Laureloceras, and Savageoceras.
References
- Walter C. Sweet, 1964. Naautiloidea-Barrandeocerida. Treatise on Invertebrate Paleongology, Part K. Geological Society of America.
- Bickmorites in Fossilworks gateway,
See also
This article is issued from Wikipedia - version of the Monday, January 25, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.