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The identity of Gastrochaena cuneiformis Spengler, 1783, and the evolution of Gastrochaena, Rocellaria, and Lamychaena (Mollusca, Bivalvia, Gastrochaenoidea)

Published online by Cambridge University Press:  20 May 2016

Joseph G. Carter ,
Trent McDowell  and
Naveen Namboodiri
Joseph G. Carter
Affiliation:
1Department of Geological Sciences, University of North Carolina at Chapel Hill, North Carolina 27599-3315,
Trent McDowell
Affiliation:
1Department of Geological Sciences, University of North Carolina at Chapel Hill, North Carolina 27599-3315,
Naveen Namboodiri
Affiliation:
2Department of Geological Sciences, University of North Carolina at Chapel Hill, North Carolina 27599-3315,
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Abstract

The specimens of Gastrochaena cuneiformis Spengler, 1783, with Spengler-written labels at the Zoologisk Museum, Copenhagen, did not come from Spengler's type locality in the Nicobar Islands, and may instead be syntypes of Chemnitz's (1788) West Indies “Pholas hians”. the identity of Gastrochaena cuneiformis as a senior synonym of Gastrochaena gigantea (Deshayes, 1830) is established on the basis of Spengler's original descriptions and illustrations, and by examination of specimens from the type locality. A neotype for G. cuneiformis is designated and illustrated, and its genus is revised to exclude Rocellaria Blainville, 1829, and Lamychaena Freneix in Freneix and Roman, 1979. Gastrochaena Spengler, 1783 is the most plesiomorphic of these three genera, as shown by its simple boring, short siphons, and diffuse, poorly differentiated anterior pedal muscles. Rocellaria evolved from a close common ancestor with Gastrochaena, and is characterized by a ventral shift and fusion of the posteroventral pallial sinus with the posteroventral pallial band, low, irregular posterior commarginal lamellae, and well defined anterior pedal retractor muscles generally supported by myophores. Lamychaena evolved from Rocellaria during the Oligocene, extending its ctenidia far posterior into the siphonal part of the boring, and, in some species, uniting its anterior pedal retractor and protractor muscles as they approach the byssus apparatus.

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Research Article
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Journal of Paleontology , Volume 82 , Issue 1 , January 2008 , pp. 102 - 117
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Copyright © The Paleontological Society 

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