Chlamys (Chlamys) beringiana graui MacNeil, 1967
MACNEIL, F. S. 1967. Cenozoic pectinids of Alaska, Iceland, and other nothern regions. United States Geological Survey Professional Paper, 553: iv + 1-57, pls. 1-25. [p. 26]
«Chlamys (Chlamys) beringiana graui MacNeil, n. subsp.
Not figured Chlamys islandica behringiana, Grau, 1959, Allan Hancock Pacific Exped. v. 23, pl. 23, fig. 2.
Discussion.— This is the most coarsely sculptured form of C. beringiana. It is closest to C. b. strategus and future collecting may show that it is only an extreme variant of that form. The ribs of C. b. graui are sharper and steeper sided than in C. b. strategus, and they extend more nearly to the beak. The interspaces of the left valve have a single strong interstitial rib. In C. b. strategus the ribs are broad and rounded and they break up near the margin into fasciclelike bundles. The interspaces are moderately broad and shallow, and they may contain several interstitial riblets.
It is presumed that the specimen figured by Grau from Saint Paul Island in the Pribiloffs, in the collections of the U.S. National Museum, is not one of the specimens on which Dall based his Pecten hericeus var. strategus; the latter form is stated to be from Unalaska. The collection at Stanford University contains a left valve from Saint Paul that is almost identical with the left valve figured by Grau; it is bright red. The most closely related known fossil form is C. coatsi middletonensis. C. b. strategus more nearly resembles C. c. middletonensis, however, than does C. b. graui. Holotype: USNM 271731, measures 58 mm in height and 53 mm in length. Type Iocality: Recent, Saint Paul Island, Pribiloff Islands, Alaska.» FRANCIS STEARNS MACNEIL, 1967
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Chlamys islandica behringiana (Middendorff); G. Grau, 1959, Pectinidae of the eastern Pacific, plate 23, figure 2.
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