Similipecten eous (Melvill in Melvill & Standen, 1907)
MELVILL, J. C. & R. STANDEN. 1907. The Mollusca of the Persian gulf, gulf of Oman and Arabian Sea as evidenced mainly through the collections of Mr. F.W. Townsend, 1893 -1906, with descriptions of new species, Part 2. Pelecypoda. Proceedings of the Zoological Society of London, 54: 783-848, pls. 53-56. [p. 808, pl. 55, fig. 9]
1907 Pecten eous Melvill in Melvill & Standen, 1907
J. C. Melvill & R. Standen, 1907,
plate 55. |
«PECTEN EOUS* Melvill, sp. n. (Plate LV. fig. 9.)
P. testa parva, perlmvi, hyalina, albo-lactea, suhdiaphana, fere rotunda, valva dextra magis convexa, sub lente obscure concentrico-striata; auriculis in sinistra subaequalibus, Iaevibus; pagina interna hyalina, Iaevi.
Alt. 3.75. lat. 4, diam. 1.50 mm. Hab. Persian Gulf: Gulf of Oman. Lat. 24° 58' N., long. 56°54' E.; 156 fathoms, shell-sand. M.C. Lat. 25° 10' N., long. 60° 34' E.; 40 fathoms. Of the same alliance as P. vitreus Chemn. and P. subhyalinus Smith (' Challenger ' Rep., vol. xiii. Lamell. p. 304, pl. xxii. figs. 2, 2 a); but is smaller than either of these species, convex, perfectly smooth excepting for very obscure incremental concentric lirae (visible only with aid of a lens) on the left valve, the auricles being quite smooth; within, it is subhyaline and smooth. Both right and left valves were equally abundant in the above dredgings, but no perfect specimen has yet been seen. One example from the latter locality exhibits slight traces of rufous coloration.» * Eous, eastern.
JAMES COSMO MELVILL, 1907
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«Description. — Shell fragile, up to c. 4 mm high, hyaline or opaque, semi-circular, inequivalve, subequilateral, right valve more inflated than left one. Both valves with some long milky-white spots. Left valve smooth, sometimes with minute commarginal lirae near the ventral margin. Right valve also smooth, with a microscopic granular structure. Anterior auricles with delicate commarginal lirae, posterior auricles smooth. Internal riblets lacking. Byssal notch small. Ctenolium absent.
Distribution. — Red Sea, Gulf of Oman, Arabian Sea, Persian Gulf and Indonesia (Dijkstra, 1991: 23). Present material from the Philippines alive in 97-120 m. The bathymetric range of live-taken specimens is 97-410 m (MNHN, ZMA). Living on soft bottom assemblages of sediments (mud, muddy sand, shellgrit). Remarks. — The present specimens from the Philippines are morphologically similar to the type material from the Gulf of Oman. A similar-looking species, Similipecten similis (Laskey, 1811) known from the eastern Atlantic, is larger in size (up to c. 7 mm high) and more brightly coloured. Another similarlooking, recently new described species from Tonga, Similipecten herosae Dijkstra & Maestrati (2008: 100), has radial sculpture on the left valve (lacking in S. eous) and internal ribs (also lacking in S. eous). This species is a new record for the Philippine Islands.» DIJKSTRA, H. H. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32, 2 tabs. [p. 22, 24]
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Similipecten eous (Melvill in Melvill & Standen, 1907); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, Philippine Islands, plate 3, figures 3a-3d, 4a-4c.
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