Cyclopecten carlottensis Bernard, 1968
BERNARD, F. R. 1968. Cyclopecten carlottensis, a new species of Pectinidae from the northeastern Pacific. Journal of the Fisheries Research Board of Canada, 25 (7): 1509-1510, figs. 1, 2. [p. 1509, figs. 1, 2]
1968 Cyclopecten carlottensis Bernard, 1968
F. R. Bernard, figures 1, 2.
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«Diagnosis. — Shell thin, silvery, translucent, inecluivalve, convex. Dorsal margin straight. Auricles prominent. Byssal notch narrow and reduced. No ctenolium. Anterior auricle large with single radial fold, ornamented with numerous scales. Posterior auricle small, prolonged, no radial folding, ornamentation similar to anterior auricle. Left valve with 12 or more rows of recurved scales forming fragile pustules which easily erode, resulting in curved plates. Secondary rows of pustules arise towards the ventral margin. The margins of the imbrications between the pustules form narrow erect threads. Right valve the smaller, no ornamentation except for concentric plications; auricles ornamented as in left valve. Interior highly polished; pallial sinus and adductor scars very slight.
Type locality. — Fisheries Research Board Station No. 66-76, off Moresby Island, Queen Charlotte Islands, British Columbia, at 52°59'00"N lat and 133°06'00"W long. Depth 1650 m. Two more specimens were collected in 1967 at Fisheries Research Board Station No. 67-37 off Queen Charlotte Islands, British Columbia, position 53°43'00"N lat and 133°27'00"W long. Depth 1450 m. Deposition and dimension of specimens are as follows: Comparison.— The species differs markedly from all other northeastern Pacific cyclopectens. There is a resemblance to C. benthalis Grau 1959, but C. carlottensis can be distinguished by the longer hinge line, the greater auricular proportion, and the more profuse ornamentation of the left valve. Cyclopecten carlottensis most closely resembles the Atlantic C. imbrifer( Lovèn) but lacks the pronounced concentric lines and is further distinguished by the intact pustules being covered by minute granulations. The new species differs from C. imbrifer specimens from the Barents Sea and Novaya Zemlya in having the pustules elongated horizontally, rather than circular or slightly longer vertically; the pustules are taller than their greatest diameter and with vertical sides, rather than blister-like and mucronate, and the rows of pustules are spaced more closely, being separated by approximately the horizontal width of the pustules. The margins of the imbrications between the pustules are appressed in C. imbrifer. The other related species, C. pustulosus Verrill, has a more substantial shell and the radial rows of pustules on the left valve are more widely spaced and not as high. The external appearance of C. carlottensis is very similar to Propeamussium hoskynsi (Verrill) (non Pecten hoskynsi G. O. Sars) but lacks the internal ribs.
Grateful thanks are extended to Dr I. McTaggart-Cowan of the University of British Columbia for kindly comparing specimens with material in the United States National Museum.»
FRANK REINHOLD BERNARD, 1968
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