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Bucanellidae is an extinct family of Paleozoic molluscs of uncertain position, belonging either to Gastropoda (snails) or Monoplacophora. The family lived from the upper Cambrian to middle Permian and the shells are characterized by a relatively small median sinus in the upper margin of the aperture, and collabral (transverse) or spiral (longitudinal) threads covering the shell. The shells are planispirally coiled (flat coiled) rather than trochospirally with a spire as is the case with most shelled gastropods.

Taxonomy

Knight et al. 1960, in the Treatise on Invertebrate Paleontology, Part I includes the Bucanellidae in the Prosobranchia, recognizing them as true gastropods, but as the subfamily Bucanellinae within the family Sinuitidae.

The current gastropod taxonomy, taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 leaves room for the Bucanellidae, and Bellerophontoidea as a whole, being either gastropods or monoplacophorans with isotrophically coiled shells, concern being whether torsion, considered diagnostic of true gastropods, took place in these animals.

Genera

Genera in the family Bucanellidae include:

• Bucanella Meek, 1871 - type genus
• Crenistriella
• Ornatosinuitina
• Sinuitella

References

1. (in German) Koken E. 1925. Die Gastropoden des baltischen Untersilurs. Zapiskii Rossiskoi Akademii Nauk, ser. 8, Otdel Fiziko-Matematicheskikh Nauk, 37(1): 326 pp., 41 plates. Bucanellidae on page 1.
2. ^ J.Brooks Knight; et al. (1960). R.C. Moore (ed.). Part I, Mollusca 1. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. I171 - I184.
3. Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdés Á. & 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
4. Meek F. B. 1871. A preliminary list of fossils collected by Dr. Hayden in Colorado, New Mexico, and California, with brief descriptions of a few of the new species. Proceedings of the American Philosophical Society 11: 425-431.

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