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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
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1304159
Page Count: 5
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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.
Journal of Paleontology © 1980 SEPM Society for Sedimentary Geology