Strepsodiscus

Taxobox


image_caption =
fossil_range = early Late Cambrian
name = "Strepsodiscus"
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
subclassis = Paragastropoda
superordo =
ordo =
subordo =
familia =
subdivision_ranks = genus
subdivision = Strepsodiscus major
,Strepsodiscus paucivoluta.

"Strepsodiscus" is a very primitive snail-like mollusc from the Early Late Cambrian (Dresbachian Age) of North America. The coiled, slightly asymmetrical shell is about 3 cm in height. Knight, et al., 1960 include it within the Cyrtolitidae, a paraphyletic or polyphyletic assemblage of proto-Gastropods and Tergomyan molluscs. "Strepsodiscus" may be too primitive to be a true gastropod.

References

* Knight, J. B., Cox, L. R., Keen, A. M., Batten, R. L., Yochelson, E. L., and Robertson, R. (1960). Systematic descriptions (Archaeogastropoda). In Moore, R. C. (ed.) Treatise on Invertebrate Paleontology. Part I. Mollusca 1, pp. 169-310. Geological Society of America and Kansas University Press, Colorado and Kansas.
* Wagner, P. J. (1999). Phylogenetics of the earliest anisostrophically coiled gastropods. "Smithsonian Contributions to Paleobiology" 88: 1 - 132.

External links

* [http://www.palaeos.com/Invertebrates/Molluscs/Gastropoda/Tropidodiscidae.html#Strepsodiscus Strepsodiscus] - Palaeos