Exochorhynchus curtis Astafieva-Urbajtis, 1981

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Discussion:

This species has an elongate form with rounded margins and a narrow
beak projecting a little above a hingeline that extends along most of
the length of the shell.

Gzhel is the type locality for Exochorhynchus curtis.

Viewer Comments:

This elongate pholadomyid bivalve is a common species at Gzhel and
is distinguished by its concentric folds in the shell and terminal beaks
on a shell about three times as long as high. The hinge axis is easily
seen on mature specimens. This species is is related to the common
Euramerican genus Wilkingia, but can be distinguished from Wilkingia
by its more elongate form and terminal beak.

Tom Yancey

References:
Astafieva-Urbajtis, K.A., 1981, The genus Exochorhynchus from the
Upper Paleozoic deposits in the USSR and Mongolia; Paleontological
Journal, v. 15, no. 3, p.29-36 (p.35-42 in Russian edition).
[Paleontological Journal is published in Russian and is the Russian
equivalent of the Journal of Paleontology.]

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