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Missouri Upper Cambrian Monoplacophora Previously Considered Cephalopods

Bruce L. Stinchcomb and Dorothy Jung Echols
Journal of Paleontology
Vol. 40, No. 3 (May, 1966), pp. 647-650
Stable URL: http://www.jstor.org/stable/1301748
Page Count: 5
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Missouri Upper Cambrian Monoplacophora Previously Considered Cephalopods
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Abstract

A zone containing fairly abundant specimens of Hypseloconus (Monoplacophora) is recorded from the Potosi Formation of Missouri. Potosi specimens of Hypseloconus are identical to the problematical form Shelbyoceras bessemerense Ulrich, Foerste & Miller, 1943, from the Copper Ridge Dolomite of Alabama, and Shelbyoceras cf. bessemerense Ulrich, Foerste & Miller, 1943, from the Potosi Formation of Missouri. These forms are here referred to the Monoplacophora as Hypseloconus bessemerense. Another species of Shelbyoceras, S. buttsi Ulrich, Foerste & Miller, 1943 is considered a synonym of Hypseloconus bessemerense. These forms originally described as Shelbyoceras lack characteristics of cephalopods.

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