Talochlamys inaequalis Dijkstra & Moolenbeek, 2008
DIJKSTRA, H. H. & R. G. MOOLENBEEK. 2008. Some Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Berau Islands (East Kalimantan, Indonesia). Venus [Journal of the Malacological Society of Japan], 67 (1-2): 15-26 [p. 2, figs. 7-10]
2008 Talochlamys inaequalis Dijkstra & Moolenbeek, 2008
H. H. Dijkstra & R. G. Moolenbeek, 2008, figures 1-10.
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«Material examined: Holotype (articulated specimen) (ZMA Moll. 404025), paratype (juvenile specimen) (ZMA Moll. 404026).
Type locality: NBE stat. 05. Indonesia, Kalimantan, Berau Islands, Berau delta, Lighthouse-2 reef, 02º09´33.9˝N, 118º10´11.4˝E, scuba diving, 05.X.2003. Description: Shell approximately 18 mm in height, rather solid, elongate, inequivalve, inflated, left valve slightly more convex than right valve, anterior auricle much larger than posterior, umbonal angle about 90º, colour pinkish and brownish with white dots, right valve paler. Valves sculptured with irregularly spaced and developed high rounded radial ribs, commencing at 0.5 mm shell height, extending and increasing by irregularly developed primary and secondary ribs to the ventral margin (ca. 40). Radial ribs bear small, widely spaced lamellae. Rather widely spaced commarginal intercostal lamellae throughout all growth stages. Anterior auricle of left valve with squamous radial riblets (ca. 12), anterior auricle of right valve with 5 prominent radial ribs. Posterior auricles nearly smooth. Hinge line straight. Byssal notch moderately deep, byssal fasciole rather broad and ctenolium with 6 teeth. Dimensions of the holotype: height 18.0 mm, length 14.9 mm, thickness 5.8 mm. Etymology: The radial sculpture is irregular and unequal (Lat. inaequalis, adj. = irregular, unequal, rough). Discussion: Talochlamys inaequalis n. sp. closely resembles T. zelandiae (Gray, 1843) from New Zealand in shape, but differs in sculpture by having more delicate secondary radial riblets (coarser on T. zelandiae), more developed intercostal commarginal lamellae (absent in late ontogeny on T. zelandiae) and antimarginal microsculpture (lacking in T. inaequalis n. sp. and prominent in T. zelandiae). Talochlamys pulleineana (Tate, 1887) from southeastern and southern Australia also has prominent intercostal commarginal lamellae, but differs from T. inaequalis n. sp. in shape (more oval in T. pulleineana, more elongate in T. inaequalis n. sp.), convexity (more flattened in T. pulleineana, more inflated in T. inaequalis n. sp), sculpture (stronger developed and more closely spaced lamellae on ribs of T. pulleineana, weaker and wider spaced on ribs of T. inaequalis n. sp.), and in antimarginal microsculpture (weak in T. pulleineana, lacking in T. inaequalis n. sp.).» HENK H. DIJKSTRA & ROBERT GERARD MOOLENBEEK, 2008
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