| Allocotoceras Temporal range: Darriwilian ~468–461 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Endocerida |
| Family: | †Endoceratidae |
| Genus: | †Allocotoceras Teichert & Glenister 1953 |
Allocotoceras is an endocerid from the Lower Ordovician (upper Canadian) Karmberg Formation of Australia (Tasmania), included in the Endoceratidae, based on small, straight or gently curved siphuncles.
Septal necks, according to Teichert, 1964, are holochoanitic, reaching to the previous septum. Endocones are described as having a dorsal wedge, or process, making the internal opening, or endosiphocone, semicircular in cross section. In this sense Allocotoceras seems to resemble the genus Najaceras.
References
- Allocotoceras at Fossilworks.org
Further reading
- Corbett, K. D.; Banks, M. R. (1973). "Ordovician stratigraphy of the Florentine Synclinorium, southwest Tasmania" (PDF). Papers and Proceedings of the Royal Society of Tasmania. 107: 207–238. doi:10.26749/rstpp.107.207. S2CID 126628381.
- Teichert, C. 1964. Endoceratoidea. Treatise on Invertebrate Paleontology, Part K. Endoceratoidea, Actinoceratoidea, Nautiloidea. Geological Soc. of America and Univ. Kansas Press
External links
| Taxon identifiers | |
|---|---|
| Allocotoceras | |