Cyclopecten kermadecensis (E. A. 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: 1-341, pls. 1-25 [p. 302, pl. 21, figs. 7, 7a]
1885 Pecten kermadecensis E. A. Smith, 1885
E. A. Smith, 1885, plate 21.
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«Testa fragilis, tenuissima, pellucida, valde compressa, valvis diverse sculptis. Valva dextra liris gracillimis confertis concentricis instructa, sinistra liris concentricis magis distantibus radiatimque pulcherrime squamulatis ornata. Auriculae inaequales, anticis majoribus, in valva dextra antica inferne sinuata, porca angusta marginata. superne cristulata. Umbones mediocriter acuti, lateribus divergentibus rectis.
Only two valves described above were obtained, and it is even possible that they do not both belong to one and the same species. They are about as long as high, very thin and fragile, transparent whitish, very much flattened, and ornamented with different sculpture. The right has fine close-set concentric lirse, which become a trifle more pronounced as the shell increases. The left also bears numerous rather more remote and more elevated concentric lirse, supporting many radiating series of small scales, of which one or two indications are visible in the right valve. The ears are unequal, the anterior being conspicuously larger than the posterior. The front one in the right valve is sinuated beneath, and is margined along the oblique dorsal slope by a smoothish ridge, which is concave ou the reverse side. The lines of growth are conspicuous on the ears, and in the right valve are produced upward, forming a crested edge to the hinge-line. The beaks are moderately acute, having an apical angle of about 108°, the converging lines being rectilinear.
Length 7½ mm., height 7½, diameter 2½. Habitat.— Station 171, north of Kermadec Islands, at a depth of 600 fathoms. This is a fragile species, and probably, living at such a depth, never becomes much thickened.» EDGAR ALBERT SMITH, 1885
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«Type data: Holotype BMNH 87.2.9.3279, "Challenger" stn 171, 28°33'S, 177°50'W, N of Kermadec Islands, 1097 m.
Other material examined: KERMADEC ISLANDS: BS312, 4 miles NNE of Herald Is., Raoul I., alive, 1189-1225 m, R.V. "Acheron" (NMNZ M.222131, 1 pr).
Distribution: Kennadec Islands, 1097-1225 m, living at 1189-1225 m.
Remarks: Smith (1885) stated that "Only two valves were obtained, and it is even possible that they do not both belong to one and the same species..." From examination of the two valves it is plausible that they represent a single individual, as the length of the hinge line of both valves (4.5 mm) is the same, and both valves fit together well. The fragile marginal apron of the right valve is broken off.
The present specimen is similar to the type valves.» DIJKSTRA, H. H. & B. A. MARSHALL. 1997. Pectinoidea (Mollusca: Bivalvia: Propeamussiidae: Pectinidae) of Lord Howe Island, Norfolk Island and the Kermadec Islands. Molluscan Research, 18 (1): 73-114, figs. 1-13. [p. 88]
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Cyclopecten kermadecensis (E. A. Smith, 1885); H. H. Dijkstra & B. A. Marshall, 1997, Pectinoidea (Mollusca: Bivalvia: Propeamussiidae: Pectinidae) of Lord Howe Island, Norfolk Island and the Kermadec Islands, plate 6, figures 13-16.
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