Allocotoceras

Allocotoceras
Temporal range: Darriwilian
~468–461 Ma
Scientific classification Edit this 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),[1] 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

  1. ^ 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