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Redescription of Spirodentalium Walcott (Gastropoda: Late Cambrian) from Wisconsin

  • Ellis L. Yochelson (a1)

Spirodentalium Walcott, 1890, was originally described as a scaphopod. A reinterpretation of the type lot suggests that its overall shape is that of an open-coiled gastropod. If so, this is probably the earliest known open-coiled form and it is sinistral in coiling direction.

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Bretskey P. W. and Bermingham J. J. 1970. Ecology of the Paleozoic scaphopod Plagioglypta with special reference to the Ordovician of eastern Iowa. Journal of Paleontology, 44:908924.
Fisher D. W. 1962. Small conoidal shells of uncertain affinities, p. W98W143. In Moore R. C. (ed.), Treatise on Invertebrate Paleontology, Volume W, Miscellanea. Geological Society of America and University of Kansas Press, Lawrence.
Pojeta J. Jr. and Runnegar B. 1979. Rhytiodentalium kentuckiensis, a new genus and new species of Ordovician scaphopod, and the early history of the scaphopod mollusks. Journal of Paleontology, 53:530541.
Signor P. W. III and Brett C. E. 1984. The mid-Paleozoic precursor to the Mesozoic marine revolution. Paleobiology, 10:229245.
Walcott C. D. 1890. Description of new forms of Upper Cambrian fossils. Proceedings of the United States National Museum, 13:267279. [The entire volume is dated 1891.]
Walcott C. D. 1912. Cambrian Brachiopoda. U.S. Geological Survey Monograph 51, Volume 1 (text), 872 p.; Volume 2 (illustrations), 363 p.
Yochelson E. L. 1971. A new Late Devonian gastropod and its bearing on problems of septation and open coiling, p. 231241. In Dutro J. T. Jr. (ed.), Paleozoic perspectives: essays in honor of G. A. Cooper. Smithsonian Institution Contributions to Paleobiology No. 3.
Yochelson E. L. 1978. An alternative approach to the interpretation of the phylogeny of ancient mollusks. Malacologia, 17(2):165191.
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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
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