Pecten (Chlamys) mayaguezensis Dall & Simpson, 1901
DALL, W. H. & C. T. SIMPSON. 1901. The Mollusca of Porto Rico. Bulletin of the United States, Fish and Fisheries Commission, 20: 351-524. [p. 465, pl. 55, figs. 7-9]
Subgenus CHLAMYS Bolten, 1798.
Section PLAGIOCTENIUM Dall, 1898. Pecten mayaguezensis, n. sp. Plate 55, figs. 7, 8, 9. «Shell small, solid, slightly inequilateral, inequivalve; the left or upper valve less convex, polished, white, with beautiful zigzag, subconcentric, linear, or flecked painting of dark red; ribs eighteen or nineteen, angular at the summit, with subequal, not channeled interspaces, the whole without sculpture except microscopic incremental and obsolete fine radial lines; ears practically smooth, the posterior longer; lower valve more convex, white except near the umbo, where there are a few brown flecks; sculpture about the same, except that the summits of the ribs are more rounded; anterior ear with two or three radial threads, a shallow sulcus and short ctenolium; submargins smooth; interior channeled near margin with well-marked auricular crura; hinge in right valve strong, with a long, horizontal ridge on each side of the resiliary pit corresponding to a similarly placed sulcus in the opposite valve; above the last-mentioned sulci in left valve is a similar pair of ridges; hinge showing strong provincular cross striation; cavity of left valve reddish, of right valve white or yellowish.
Length of shell, 21; height, 19; diameter, 8.5 mm. Living in 7 to 15 fathoms, sand and mud, Mayaguez Harbor, Porto Rico, at stations 6058 and 6061. This is an extremely elegant little shell, perfectly distinct from any recorded species.» WILLIAM HEALEY DALL & CHARLES TORREY SIMPSON, 1901
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W. H. Dall & C. T. Simpson, 1901, plate 55,
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