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Middle Pennsylvanian (Allegheny Group) Polyplacophora from Ohio

R. D. Hoare, M. T. Sturgeon and T. B. Hoare
Journal of Paleontology
Vol. 46, No. 5 (Sep., 1972), pp. 675-680
Stable URL: http://www.jstor.org/stable/1303024
Page Count: 9
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Middle Pennsylvanian (Allegheny Group) Polyplacophora from Ohio
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Abstract

Specimens of the Class Polyplacophora are common at five localities in the Allegheny Group in eastern Ohio. Representatives of Helminthochiton and Pterochiton have been identified; Chiton carbonarius Stevens (H. concinnus Richardson) is transferred to Pterochiton and is represented by nine specimens of associated and disassociated valves on a small block of Putnam Hill Limestone and numerous isolated valves in the Putnam Hill and Vanport Shales. The mode of preservation of specimens in limestone presents additional information on the microstructure of the valves, particularly the porous nature of the tegmentum. Other specimens form the basis of a new genus, Acutichiton. Helminthochiton simplex (Raymond) is represented by one complete individual and several head, intermediate and tail valves. Specimens of this species have been found in shale and limestone portions of the Putnam Hill and Vanport units. Pterochiton spatulatus n. sp. is represented by numerous disarticulated head, intermediate and tail valves. They were found in association with H. simplex and P. carbonarius in the shale portion of the Vanport unit. Several intermediate and tail plates, found associated with specimens of Pterochiton carbonarius, P. spatulatus and H. simplex in the Vanport Shale, represent a new genus, Acutichiton, of the Family Lepidopleuridae. Only the type species, A. pyrmidalus, n. sp., is recognized here. Related head valves of this species have not been identified.

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