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Some molluscan problematica from the Upper Cambrian–Lower Ordovician of the Ozark uplift

Published online by Cambridge University Press:  14 July 2015

Bruce L. Stinchcomb  and
Guy Darrough
Bruce L. Stinchcomb
Affiliation:
St. Louis Community College at Florissant Valley, St. Louis, Missouri 63135
Guy Darrough
Affiliation:
47 Pomme Ave., Arnold, Missouri 63010
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Abstract

The mollusk Hemithecella, which occurs abundantly both above and below the Cambrian-Ordovician boundary in the Ozark region of Missouri, is discussed and compared with Matthevia and with the polyplacophoran order Paleoloricata and found to be distinctly different. Based upon the presence of monoplacophoran-like multiple muscle scars and asymmetrical valves, Hemithecella and related forms described here are considered to be molluscan problematica. Hemithecellids are mollusks; however, their affinity to other classes is unclear although structural similarities to the Monoplacophora are noted. The new order Hemithecellitina is proposed. It contains two new families, the Hemithecellidae and the Robustidae. Three new genera, Conodia, Robustum, and Elongata, and nine new species are proposed: Conodia levicosta, C. acuminata, Robustum nodum, R. phallarium, Elongata perplexa, Hemithecella elongata, H. abrupta, H. quinquelites, and H. eminensis.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue 1 , January 1995 , pp. 52 - 65
Copyright
Copyright © The Paleontological Society 

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References

Bergenhayn, J. R. M. 1960. Cambrian and Ordovician loricates from North America. Journal of Paleontology, 34:168–178.Google Scholar
Bridge, J. 1931 (1930). Geology of the Eminence and Cardareva quadrangles. Missouri Bureau of Geology and Mines, 2nd series, 24, 228 p.Google Scholar
Butts, C. 1941. Geology of the Appalachian Valley in Virginia. Pt. II. Fossil plate and explanations. Virginia Geological Survey Bulletin 52, 271 p.Google Scholar
Davidson, T., and King, W. 1874. On the Trimerellidae, a Paleozoic family of the Palliobrachs or Brachiopoda. Quarterly Journal Geological Society of London, 30:124–173.Google Scholar
Dzik, J. 1986. Turrilepadida and other Machaeridia, p. 116–134. In Hoffman, A. and Nitecki, M. N. (eds.), Problematic Fossil Taxa. Oxford University Press, New York.Google Scholar
Fisher, D. W. 1962. Small conical shells of uncertain affinities, p. W98–W143. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. W, Miscellanea. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Hyman, L. H. 1951. The Invertebrates: Platyhelminthes and Rhynchocoela. The Acoelomate Bilateria, Volume 2, p. 365–696. McGraw-Hill, New York.Google Scholar
Kluessendorf, J. 1987. First report of Polyplacophora (Mollusca) from the Silurian of North America. Canadian Journal of Earth Science, 24:435–141.CrossRefGoogle Scholar
Knight, J. B. 1941. Paleozoic gastropod genotypes. Geological Society of America, Special Paper 32, 510 p.Google Scholar
Knight, J. B., Batten, R. L., Yochelson, E. L., and Cox, L. R. 1952. Primitive fossil gastropods and their bearing on gastropod classification. Smithsonian Miscellaneous Collections, 117:13.Google Scholar
Knight, J. B., Batten, R. L., Yochelson, E. L., and Cox, L. R. 1960. Supplement, Paleozoic and some Mesozoic Caenogastropoda and Opisthobranchia, p. 1310–1324. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. I, Mollusca 1. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Pojeta, J. Jr. 1987. Class Rostroconchia, p. 358–380. In Boardman, R. S., Cheetham, A. H., and Rowell, A. J. (eds.), Fossil Invertebrates. Blackwell Scientific Publications, Palo Alto, California.Google Scholar
Rolfe, W. D. I. 1981. Septemchiton—a misnomer. Journal of Paleontology, 55:675–677.Google Scholar
Runnegar, B., Pojeta, J. Jr., Taylor, M. E., and Collins, D. 1979. New Species of the Cambrian and Ordovician chitons Matthevia and Chelodes from Wisconsin and Queensland: evidence for the early history of polyplacophoran mollusks. Journal of Paleontology, 53:1374–1394.Google Scholar
Smith, A. G. 1960. Amphineura, p. 141–176. In Moore, R. C. (ed.), Treatise of Invertebrate Paleontology, Pt. I, Mollusca 1. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Smith, A. G., and Hoare, R. D. 1987. Paleozoic Polyplacophora: a checklist and bibliography. Occasional papers of the California Academy of Sciences, No. 146, 71 p.Google Scholar
Stinchcomb, B. L. 1978. The paleontology and biostratigraphy of the Lower Ordovician Gasconade Formation of Missouri. Unpubl. Ph.D. dissertation, University of Missouri-Rolla, 182 p.Google Scholar
Stinchcomb, B. L. 1986. New monoplacophora (Mollusca) from Late Cambrian and Early Ordovician of Missouri. Journal of Paleontology, 60:606–626.CrossRefGoogle Scholar
Ulrich, E. O., Foerste, A. F., Miller, A. K., and Furnish, W. M. 1944. Ozarkian and Canadian Cephalopoda, longicones and summary. Geological Society of America, Special paper 58, 226 p.Google Scholar
Walcott, C. D. 1885. Note on some paleozoic pteropods. American Journal of Science, 30:17–21.Google Scholar
Yochelson, E. L. 1966. Mattheva, a proposed new class of mollusks. U.S. Geological Survey, Professional Paper, 523–B:B1–B11.Google Scholar
Yochelson, E. L. 1978. An alternative approach to the interpretation of the phylogeny of ancient mollusks. Malacologia, 17:165–191.Google Scholar