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A Naticopsis Operculum Found in situ (Gastropoda: Mississippian)

Mackenzie Gordon, Jr. and Ellis L. Yochelson
Journal of Paleontology
Vol. 56, No. 1 (Jan., 1982), pp. 260-265
Stable URL: http://www.jstor.org/stable/1304513
Page Count: 6
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A Naticopsis Operculum Found in situ (Gastropoda: Mississippian)
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Abstract

A new gastropod species, Naticopsis (Naticopsis?) buttsi, occurs in beds of St. Louis (middle Viséan) age in the Greenbrier Limestone of southwestern Virginia. One paratype contains the operculum preserved within the aperture. This operculum is a platelike structure showing concentric growth; it is the oldest known neritacean operculum in North America and the first found in situ. This specimen confirms earlier opinions that assigned opercula of this general growth form to the Neritacea. The operculum differs markedly from that of Hypodema, an operculum from upper Viséan beds in Belgium.

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