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Life association of shell and operculum of Middle Ordovician gastropod Maclurites

Published online by Cambridge University Press:  20 May 2016

David M. Rohr  and
Ellis L. Yochelson
David M. Rohr
Affiliation:
Sul Ross State University, Alpine, TX 79832,
Ellis L. Yochelson
Affiliation:
Department of Paleobiology, National Museum of Natural History, Washington, D.C. 20560
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Abstract

The only two known life associations of the shell and operculum of Maclurites Le Sueur, 1818, are described for the first time. Maclurites cf. magnus Le Sueur, 1818, from the Middle Ordovician of Alaska demonstrates that the operculum fits slightly inside the aperture, and when closed, the operculum extends down below the base of the shell and may have acted as an anchor. The operculum of Maclurites bigsbyi (Hall, 1861), from the Middle Ordovician of Wisconsin, is illustrated for the first time and is confirmed to be distinct from Maclurina logani (Salter, 1859).

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 6 , November 1999 , pp. 1078 - 1080
Copyright
Copyright © The Paleontological Society 

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