Delectopecten polyleptus (Dall, 1908)
DALL, W. H. 1908. The Mollusca and the Brachiopoda. Reports on the Mollusca and Brachiopoda [U. S. Fish Commission Steamer ''Albatross'' during 1891 and 1905] region. Bulletin of the Museum of Comparative Zoology at Harvard University, 43 (6): 203-487. [p. 403, pl. 10, fig. 9]
1908 Pecten (Pseudamusium) [sic] polyleptus Dall, 1908
W. H. Dall, 1908, plate 10.
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«Shell small, thin, translucent white, compressed, having a marked "Camptonectes" striation, beside about thirty-six radial rows of minute, elevated, granule-like scales, very easily detached and more crowded near the middle of the base; hinge line straight ; anterior ear in the right valve long, prominent, with five radial rows of scales and obvious concentric striation; byssal notch deep and wide, with a broad fasciole, the ctenolium with three free teeth; posterior ear not differentiated by a notch; profile of the valve, below and behind, a segment of a circle; interior with glassy polish, scar small and high up, hardly visible; margins entire; ligameutary pit small, shallow. Alt. of valve, 9.5; Ion. of valve, 9.5; of hinge line, 6.5; diam. of right valve, 1.2 mm.
U. S. S. "Albatross," station 4642, Galapagos Islands, four miles S., 41° E., from Ripple Point, Hood Island, in 300 fathoms, globigerina sand, bottom temperature 48°. 6 F. U. S. N. Mus. 110,586. Only the right valve was obtained at this station, but at station 2781, on the west coast of Patagonia, Southern Chile, in South Lat. 51° 52', in 348 fathoms, mud, bottom temperature 50° P., a left valve which probably belongs to the same species was dredged by the "Albatross" in 1888. The sculpture is essentially similar, except that the scales are fewer and more distant from each other; only 34 rows could be counted, and the umbonal part of the valve shows several concentric undulations. The cars are large, subequal, the anterior larger with six radial rows of scales. The "Camptonectes" sculpture is conspicuous upon the glassy shell.» WILLIAM HEALEY DALL, 1908
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«Remarks: Although similar to Cyclopecten vancouverensis, this species differs greatly in sculpture. While C. vancouverensis has spinose radial ridges, C. polyleptus has radial rows of scales, the ridges on the former numbering twice as many as the rows of scales on the latter (often more); C. vancouverensis has very minute, irregular, discontinuous and rather divergent radial striae, C. polyleptus having fine but
more prominent radial ridges, which are only slightly irregular and are continuous; the scales are also larger and more fluted in appearance on C. polyleptus. This species is known only from the type locality, the other Albatross station (off southern Chile) mentioned by Dall, and station 2818, near the Galapagos Islands (in 392 fathoms).» GRAU, G. 1959. Pectinidae of the eastern Pacific. Allan Hancock Pacific Expeditions, 23: i-viii, 1-308, 57 pls. University of Southern California Press. Los Angeles, California. [p. 43, 44]
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Cyclopecten (Delectopecten) polyleptus (Dall) 1897; G. Grau, 1959, Pectinidae of the eastern Pacific, plate 16, figures 1-3.
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