Argopecten seymourensis (Dall & Ochsner, 1928)
DALL, W. H. & W. H. OCHSNER. 1928. Tertiary and Pleistocene Mollusca from the Galapagos Islands. Proceedings of the California Academy of Sciences, 17 (4): 89-139, pls. 2-7. [p. 119, pl. 2, fig. 22].
1928 Pecten seymourensis Dall & Ochsner, 1928
W. H. Dall & W. H. Orcher, 1928, plate 2.
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«Shell rather large, ovate, moderately inflated, solid; right valve with a rather short hinge-line and narrow submargin; anterior ear short (defective), posterior longer, radially sculptured with small threads, submargin with obsolete similar sculpture; hinge rather feeble with a moderately large shallow resiliary pit; external sculpture of 18 squarish, dorsally smooth and flat, radial ribs, with narrower channelled interspaces concentrically, finely lamellose; interior obscured by matrix, basal margin internally grooved in harmony with the external ribbing. Height, 57 mm.; breadth, 53 mm.; diameter of right valve, 12 mm.
Holotype: No. 2948; paratype: No. 2949, Mus. Calif. Acad. Sci., collected by W. H. Ochsner, November 21, 1905, from upper horizon, Seymour Island, Galapagos Group. Probably Pliocene. This species belongs to the group of P. purpuratus Lam., but is sufficiently distinct. The left valve was not obtained». WILLIAM HEALEY DALL & WASHINGTON HENRY OCHSNER, 1928
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