Pecten tereinus Dall, 1925
DALL, W. H. 1925. Notes on the nomenclature of some of our east American species of Pecten with descriptions of new species. The Nautilus, 38 (4): 112-120. [p. 115]
«Pecten (Euvola) tereinus n. sp.
Shell small for the group, depressed, thin, pale, the colors when present delicate; the lower valve with about twenty-five low flattened ribs, with shallow not channeled interspaces, or with the ribs obsolete altogether, or ill defined; concentric sculpture weak; the ears subequal, hardly sculptured, the byssal notch shallow, with no ctenolium; internally the valve is white, the grooves corresponding to the ribs, extend over the whole disk and are well defined; upper valve flat or slightly concave, with about 19 narrow elevated not dichotomous ribs with wider interspaces; the concentric sculpture well marked; this valve is usually more effectively colored than the other; internally it is grooved like the other; the outline of the shell is nearly circular, the hingeline short, the cartilage pit very small; height 28; length of valves 30; of hingeline 19; diameter 4 mm. U. S. Nat. Mus. Cat. No. 333632.
Miami Florida, to the Bahamas and south to Cape Roque, Brazil. The type specimen was dredged off Key West at station 3318 of the U. S. Fish Commission, in 45 fathoms, coral, bottom temperature 75° F. This species differs from P. raveneli, its nearest relative, in the obsolescence of the external ribbing, the absence of channelling and color in the spaces between the ribs; in the depressed form, and in the production of the internal grooving over the whole disk, while in P. raveneli it is confined to the more marginal portion. This latter feature is probably due to the thinner shell in P. tereinus. The coloration is uniformly more delicate and paler.» WILLIAM HEALEY DALL, 1925
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