Mirapecten spiceri (Rehder, 1944)
REHDER, H. A. 1944. A new pectinid shell from the Pacific Ocean, with a note on the genus Pallium Schroeter. The Nautlilus, 58 (2): 52-54, pl. 2. [p. 52, pl. 2 figs. 1, 2]
1944 Comptopallium spiceri Rehder, 1944
H. A. Rehder, 1944, plate 2.
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«Shell of medium size, subequivalve, the left valve somewhat flatter than the right; valves equilateral, except that the anterior auricles are larger than the posterior ones. The sculpture consists of broad, rounded, rather distantly separated ribs (8 in left valve, 9 in right), and very fine axial riblets, which are strongest on the ribs, where one or more at the summit are elongately knobbed; the smaller marginal ribs may bear small scaly spines. Very fine growth lines are visible especially between the ribs. Auricles subequal, the right posterior one finely and closely radiately ribbed, the others more irregularly and distantly ribbed. External hinge margin of right valve with several erect squamiform nodules. The byssal notch in the right valve has a short ctenolium with six teeth. Color white, irregularly concentrically streaked with reddish-orange and yellowish-orange (near the ventral margin). Internally the auricles have several short elongated nodules near the lateral margins, and the left valve has two narrow dorsal ridges running from the resilifer parallel to and as long as the hinge margin. These fit between similar ridges in the right valve, the upper ones equally long, the lower ones less than one-third as long; the area of these ridges has minute, axial vermiculate sculpture. There are numerous short white radial ridges along the margin of the shell. The interior shows the external reddish-orange color shining through and the margin is, moreover, tinted with orange.
The type, figure 1, U.S.N.M. No. 518010, is a right valve, and measures: Height, 39.8 mm.; breadth, 37.9 mm. A paratype, figure 2, U.S.N.M. No. 518011, is a left valve, and it measures: Height, 35.2 mm.; breadth, 32.2 mm. Both valves were collected on Christmas Island (157º 20' W. Long., 1º 55' N. Lat.), Line Islands, Central Pacific, by Mr. V. D. P. Spicer. This species differs from the genotype, C. pauciplicatum Iredale, from Queensland, and C. radula Linné from the East Indies, in being smaller, broader, with fewer, broader, and more rounded ribs and with much finer concentric sculpture. The coloring is also brighter. The name radula has been dismissed from the Pectinidae by Iredale¹ because the figures cited by Linnaeus were those of a Lima. The brief diagnosis, however, is obviously that of a pectinid and applicable to the group in question; it is in total disagreement with the figures, as was often the case in the Systema Naturae. That Linnaeus realized these references were faulty is shown by the fact that eight years later, in the Museum Ludovicae Ulricae, he transfers the original Rumphius reference, of which the Kleinian figure is merely a copy, to Ostrea lima, and uses instead the citation Rumph. Mus. t. 44, fig. AA, which correctly represents the shell usually known as radula Linné. For these reasons I see no valid reason for not using radula as a valid name in the genus Comptopallium.» ¹ British Museum. Great Barrier Reef Exped., 1928-29, Sci. Reports, vol. 5, No. 6, Mollusca, pt. 1, 1939, p. 360.
HARALD ALFRED REHDER, 1944
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«Mirapecten boutetorum spec. nov. differs from M. spiceri (Rehder, 1944), known from the Line Islands, by having broader plicae and narrower interspaces (narrower plicae and wider interspaces in M. spiceri), by having strongly developped scales on the plicae (almost lacking or with small, weak nodules in M. spiceri), and by lacking delicate radial sculpture on both valves (present in M. spiceri).»
DIJKSTRA, H. H. 2011. A new species of living scallop of the genus Mirapecten (Bivalvia, Pectinidae) from French Polynesia. Basteria, 75 (4-6): 63-69, figs. 1-24. [p. 68]
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Mirapecten spiceri (Rehder, 1944),; H. H. Dijkstra, 2011, A new species of living scallop of the genus Mirapecten from French Polynesia, figures 17-20.
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