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New Information on Late Cambrian Monoplacophora Hypseloconus and Shelbyoceras (Mollusca)

Bruce L. Stinchcomb
Journal of Paleontology
Vol. 54, No. 1 (Jan., 1980), pp. 45-49
Stable URL: http://www.jstor.org/stable/1304159
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
New Information on Late Cambrian Monoplacophora Hypseloconus and Shelbyoceras (Mollusca)
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Abstract

Identification of the problematic genera Shelbyoceras and Hypseloconus as undoubted monoplacophorans is substantiated by new material from the Cambrian of Missouri. Muscle scars of H. stabilis, demonstrate that the hypseloconids are monoplacophorans in which the apex probably curves posteriorly. Shelbyoceras, formerly considered to be a primitive cephalopod, is regarded as a septate monoplacophoran which exhibits a lateral band, a characteristic of some monoplacophorans.

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