Argopecten evermanni (Jordan & Hertlein, 1926)
JORDAN, E. K. & L. G. HERTLEIN. 1926. Expedition to the Revillagigedo Islands, Mexico, in 1925, VII. Contribution to the Geology and Paleontology of the tertiary of Cedros Island and adjacent parts of lower California. Proceedings of the California Academy of Sciences [4th Series], 15 (14): 409-464, pls. 27-34. [p. 439, pl. 27, fig. 1]
1926 Pecten (Plagioctenium) evermanni Jordan and Hertlein, 1926
E. K. Jordan and L. G. Hertlein, 1926, plate 27.
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«Shell large, thick, moderately inflated. Right valve ornamented by 30 or 31, flattish topped, equal, radiating ribs, separated by narrow, slightly rounded interspaces, both the ribs and interspaces crossed by concentric lines of growth and the sides of ribs fringed by concentric lamellae; anterior ear sculptured by about four radiating ribs, a very prominent thickening at base of ear; posterior ear somewhat similar to anterior in ornamentation, but without any large ridge at base. Length about 125 mm.; height 115 mm.; apical angle 108°.
Type: Right valve, No. 2108, paratype, No. 2109, Mus. Calif. Acad. Sci., from Loc. 928, Bernstein's abalone camp, Cedros Island; upper Pliocene; G. D. Hanna and E. K. Jordan, collectors. P. evermanni differs from P. hakei Hertlein in possessing more numerous ribs which are flatter and much closer together. From P. purpuratus Lamarck, P. evennanni can be distinguished by the much greater number of ribs in the new species. This species is named in honor of Dr. Barton Warren Evermann, Director of the California Academy of Sciences, in recognition of his notable scientific and executive accomplishments». ERIC KNIGHT JORDAN & LEO GEORGE HERTLEIN, 1926
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