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Description of a muscle scar and two other novel features from steinkerns of Hypomphalocirrus (Mollusca: Paragastropoda)

Published online by Cambridge University Press:  20 May 2016

Kenneth M. Schopf  and
Paul J. Morris
Kenneth M. Schopf
Affiliation:
Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts 02138
Paul J. Morris
Affiliation:
Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts 02138
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Abstract

Three novel features are described in steinkerns of Hypomphalocirrus rugosus Linsley from the Middle Devonian Rogers City Limestone of Michigan. The first feature is located about one-half a volution adapertural of the terminal septum. It has the appearance of a typical molluscan muscle attachment scar and is interpreted as such. The two other features are more enigmatic. They have a less stereotyped appearance and location. The first is interpreted as a field of mantle point-attachments and the other as a product of partial shell dissolution. Comparisons with extant and fossil molluscs confirm that the two features ascribed to biologic origins are within the scope of molluscan soft-part and shell attachment morphologies.

Type
Research Article
Information
Journal of Paleontology , Volume 68 , Issue 1 , January 1994 , pp. 47 - 58
Copyright
Copyright © The Paleontological Society 

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