Title: Bulletin
Identifier: bulletin41peab (find matches)
Year: 1978 (1970s)
Authors: Peabody Museum of Natural History
Subjects: Natural history; Natuurlijke historie
Publisher: New Haven : The Museum
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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ECOLOGY AND EVOLUTION OF THE GASTROCHAENACEA 57
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Fig. 5L Myocoticha sp. (Myoconchinae, Permophoridae) Permian Supai Formation, Arizona. Photo- graphic reproduction of plate 8, figure 15(middle; valve interior; AMNH 28035:1), figure 16a(above; valve exterior; AMNH 28035/1:1) and figure 16b (below; dorsal view of both valves; AMNH 28035/ 1:1) from Winters (1963). The lower scale bar refers to the upper and lower figures; the upper scale bar refers only to the middle figure. Fig 52, SanguinoHtesf sp., Permian Kaibab Formation, Arizona, rubber squeeze from an external mold. Photographic reproduction of plate 10, figure 16 from Chronic (1952). their shallow burrowing ancestors. They would become morphologically specialized for boring primarily in their anteroventral pedal gape. This permits permanent pedal attachment and the application of a wide area of mantle epithelium to the burrow walls for chemical boring. A corollary of this hypothesis is that Spengleria represents a primitive stock from which the more mechanically boring gastrochaenids evolved. Natural selection for efficient mechanical boring would result in the anterior reduction, streamlined lateral profile, united siphons, and concentrated pedal mus- culature characteristic of modern Gastrochaena. Unfortunately, the taxonomic affinities of Sangumolites? sp. and similar Upper Paleozoic forms possibly ancestral to Spengleria have not been satisfactorily determined. It is therefore uncertain whether the Gas- trochaenacea can be regarded as likely derivatives of the Permophoridae (subclass Heteroconchia) or the Grammysiidae (subclass Anomalodes- mata). Chronic (1952) indicated that his Sanguinolites may be related to

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Carter, J.G., 1978. Ecology and evolution of the Gastrochaenacea (Mollusca, Bivalvia) with notes on the evolution of the endolithic habitat. Bulletin of the Peabody Museum of Natural History, Yale University, 41, pp.1-92. page 57, fig.51.

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