Strepsodiscus

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Strepsodiscus
Temporal range: Late Cambrian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda or Monoplacophora
Order: Bellerophontida
Superfamily: Bellerophontoidea
Family: Tropidodiscidae
Genus: Strepsodiscus
Species

Strepsodiscus major
Strepsodiscus paucivoluta

Strepsodiscus is an extinct genus of very primitive fossil snail-like molluscs from the early part of the Late Cambrian (Dresbachian Age) of North America. The coiled, slightly asymmetrical shells are about 3 cm in height. It is not known whether these are shells of gastropods (sea snails) or monoplacophorans, which are more primitive mollusks.

Bouchet & Rocroi (2005)[1] divide the Bellerophontoidea into 8 families listed Paleozoic molluscs with isostrophically coiled shells of uncertain position within Mollusca (Gastropoda or Monoplacophora)

Knight, et al., 1960 included this genus within the Cyrtolitidae, a paraphyletic or polyphyletic assemblage of proto-gastropods and Tergomyan molluscs. Strepsodiscus may be too primitive to be a true gastropod.

Species

Species within the genus Strepsodiscus are as follows:

  • Strepsodiscus major
  • S. minutissimus
  • S. paucivoluta
  • S. splettstoesseri
  • S. strongi

References

  1. ↑ Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
  • 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

  • A possible reference:
  • Info at Paleobiology Database:



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