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Life positions of fossil naticid opercula (Mollusca: Gastropoda)

Published online by Cambridge University Press:  14 July 2015

Ryuichi Majima
Ryuichi Majima*
Affiliation:
Institute of Geoscience, University of Tsukuba, Ibaraki 305, Japan
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Abstract

Two life positions of fossil naticid opercula are recognized in Pliocene deposits of Hokkaido, northern Japan. In one position, the operculum seals the aperture. In the other position, the operculum is pressed against the shell base adjacent to the aperture. The death position of the head-foot mass can be reconstructed from the two opercular positions, which coincide, respectively, to naticids that died with the head-foot mass retracted into the shell, and those that died with it entirely extended from the shell.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue 1 , January 1987 , pp. 62 - 65
Copyright
Copyright © The Paleontological Society 

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References

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