Argopecten noronhensis (Smith, 1885)
SMITH, E. A. 1885. Report on the Lamellibranchiata collected by H.M.S. Challenger during the years 1873-76. In C. W. Thomson & J. Murray: Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-1876. Zoology, 13 (35): 341 pp. [p. 296, pl. 21, figs. 4-4b]
1885 Pecten noronhensis Smith, 1885
E. A. Smith, 1885, plate 21.
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«Testa paulo inaequivalvis, convexa, inaequilateralis, alba, aurantio vel saturato-roseo maculata, costis ad 17 valde prominentibus instructa; costae valvae dextrae interstitiis profundis pulcherrime transversim lamellatis latiores, laevigatae; valva sinistra costis paulo gracilioribus, interstitia aequantibus, lira mediana tenui bipartitis instructa, undique et supra et inter costas tenuissime lamellata. Auriculae insequales, radiatim tenuiter costulatae. Pagina interna purpurascens, albo limbata, vel omnino alba.
This species is somewhat inequivalve, the right valve being a trifle deeper than the left. It is rather convex, and inequilateral, and has an apparent obliquity, owing to the hinder slope from the umboues being longer than the anterior. It is white, and more or less copiously blotched with orange or deep rose. The valves are differently sculptured. The right has the ribs (about seventeen in number) smooth above, and broader than the deep intervening sulci, which are most beautifully ornamented with close and excessively delicate concentric lamellae. In the left valve the ribs about equal the furrows in width, are divided into two parts by a fine central lira, and are crossed by the very delicate lamellae which also occur in the sulci. The ears are unequal. In the left valve both are concave at the sides, especially the front one, which is the smaller. In the right valve the posterior is incurved laterally, and the anterior is deeply cut in underneath and ornamented with about five squamate ridges. The interior of the largest specimens is purple, with the exception of a narrow white border, but smaller specimens are entirely colourless within. Length 27 mm., height 26, diameter 12. Habitat.— Station 113A, off Fernando Noronha, in 25 fathoms; volcanic sand and gravel. This species is considerably like Pecten gibbus, Linn., but may be recognised by the following differences. Judging from the few specimens at hand, it appears to be rather more convex, more inequilateral, the ribs are stouter, fewer, more elevated and sharply cut, and differently sculptured, and the posterior auricles are less oblique at the side and more concave». EDGAR ALBERT SMITH, 1885
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«Argopecten noronhensis (E. A. Smith, 1885) was originally described from the coast of Brazil, where it was dredged by the H. M. S. Challenger from a depth of 46 m off Fernando Noronha. Since Smith's original description, there have apparently been no further reports on the occurrence of the species outside of Brazilian waters. However, collections in the U. S. National Museum contain numerous specimens from Barbados (depths, 46 to 183 m), Antigua (220 m ), the Virgin Islands and Puerto Rico (73 to 256 m), and Cat Cay, Bahamas (550 m). All of these specimens were found dead with only the shells remaining on bottoms of coarse sand or coral rubble. Living specimens have been taken by the R/V Oregon off St. Lucia (66 to 75 m), south of Saba Banks (91 to 110 m), and off Tortola, Virgin Islands (49 m). Argopecten noronhensis is not known to occur in the western Caribbean or in the Gulf of Mexico. In Bermuda fragments of A. noronhensis were recovered from sediment samples taken on our deepest dive, at a depth of 51 m (Station 39). The species is illustrated in Figures 5-8».
WALLER, T. R. 1973. The habits and habitats of some Bermudian marine mollusks. The Nautilus, 87 (2): 31-52, figs. 1-33. [p. 46-47]
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Argopecten noronhensis (E. A. Smith); T. R. Waller, 1973, The habits and habitats of some Bermudian marine mollusks, figures 5-8.
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