Parvamussium pauciliratum (E. A. Smith, 1903)
SMITH, E. A. 1903. Marine mollusca. In: J. S. Gardiner (Ed.), The fauna and geography of the Maldive and Laccadive archipelagoes, Volume II, Part II: 589-630, pls. 35, 36. [p. 622, pl. 36, figs. 23, 24]
1903 Amussium [sic] paucilirata E. A. Smith, 1903
E. A. Smith, 1903, plate 36.
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«Testa parva, compressa, tenuis, pellucida, laevis, polita, aequivalvis, valva sinistra alba, dextra pellucida albo et rufo radiata et variegata, radio conspicuo albo supra latus anticum ornata; auriculae inaequales, postica valvae sinistrae infra leviter sinuata, posteriori valvae dextrae majori; umbones acuti; pagina interna radiatim substriata, lira brevi unica utrinque instructa.
Longit. 7½ mm., alt. 7½, diam. 2. An interesting little species, having one valve pure white and the other mottled and rayed witli white and red. The presence of only two internal lirae is also remarkable. In addition to these a short lira runs from the ligament-pit along the base of each auricle. Although the surface of both valves looks smooth and glossy, under a lens fine striae of growth are visible. The umbones are acute, that in the coloured or right valve being a little more prominent than that of the left. The opaque white ray down the anterior side appears to be a specific feature, for it is present in all the specimens examined.» EDGAR ALBERT SMITH, 1903
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«Description. — Shell fragile, up to c. 8 mm high, hyaline or opaque, sub-circular, inequivalve, right valve more inflated than left, slightly inequilateral, auricles almost equal, umbonal angle c. 105˚. Prodissoconch c. 200 μm in height. Left valve creamy-white stained with white dots, right valve uniform white. Left valve glossy, with a few minute growth lines, covered with microscopic granules. Auricles smooth on most specimens, a few have delicate commarginal lirae near anterior margin. Right valve also glossy, smooth apart from microscopic granules. Anterior auricle with minute commarginal lirae. Hinge line straight. Internal riblets rudimentary, 1 or 2 laterally, with a small auricular lira on each side in most specimens. Resilifer triangular. Byssal notch very narrow.
Distribution. — Maldive Islands: 2-66 m (Smith, 1903); Indonesia: 34-467 m (dead) (Dijkstra, 1991; Dijkstra & Kastoro, 1997); Papua New Guinea: 48-125 m (Dijkstra, 1998a); Chesterfield Islands (Coral Sea): 150-225 m (dead), New Caledonia: 27-45 m (Dijkstra, 1995b). Present material from the Philippines alive in 62-80 m (minimum depth range). The bathymetric range of live-taken specimens is extended to 45- 80 m. Living free on soft bottom assemblages (sand and coral rubble, muddy sand or mud). Remarks. — The present specimens from the Philippines are identical to the type specimens from the Maldive Islands (Indian Ocean). 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. 21]
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Parvamussium pauciliratum (E.A. Smith, 1903); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, Philippine Islands, plate 3, figures 1a-1d.
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