Leptopecten Verril, 1897
VERRILL, A. E. 1897. A study of the family Pectinidae, with a revision of the genera and subgenera. Transactions of the Connecticut Academy of Arts and Sciences, 10: 41-95, pls. 16-21. [p. 69]
«Leptopecten, new subgenus of Chlamys. Type, C. Monotimeris (Conrad).
Shell thin, translucent, oblique, broadly rounded, with strong,brounded radial ridges or folds, like corrugations, which appear inbreverse on the interior surface. The internal ribs are not angulated by a deposit of shell, nor distinctly thickened. Margin with broad scallops. The exterior surface is covered with fine divergent camptonectes sculpture, both on the ribs and intervals. The ribs do not increase in number with age, but become broader and more flattened. Auricles large and broad, thin, corrugated. Byssal notch large and deep. Pectinidial teeth prominent. Hinge-plate thin and but little differentiated. Cardinal ridge thin and small, close to the ligament, crossed by fine incisions. The resilial pit is small, but projects beyond the thin hinge-plate in the left valve.
This is a peculiar group, remarkable for its thin but strongly corrugated oblique shells, with fine camptonectes sculpture. C. monotimeris (Con.), from the California coast, is the only species studied. ADDISON EMERY VERRILL, 1897
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Pecten Monotimeris; T. A. Conrad, 1837, Descriptions of new Marine Shells, from Upper California, Collected by Thomas Nuttall, plate 18, figure 10.
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