Talochlamys gladysiae (Melvill, 1888)
MELVILL, J. C. 1888. Descriptions of six new species of Pecten. The Journal of Conchology, 5: 279-281 [p. 279, pl. 2, fig. 5]
J. C. Melvill, 1888, plate 2.
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«P. testa ovata, pertenui, planiuscula, straminea, albis flocculis nubeculata, valvis subaequalibus, costis lirisque numerosissimis, fere triginta, sublaevibus, auriculis inaequalibus, flexuosis.
Long. 28 mill., lat., 24 mill. Habitat ? A very striking form, and not very nearly allied to any species with which I am acquainted. The thin, flattened valves, of a bright straw colour, are clouded here and there with flaky-white markings, the ribs and ridges are extremely numerous, about thirty altogether in either valve.» JAMES COSMO MELVILL, 1888
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«Type data. — Pecten gladysiae Melvill: Holotype (H 26.9 mm, pv) NMW 1955.158.10. Type locality: Unknown. Chlamys elsae Wagner: Holotype (H 23.8 mm, pv) ZMA Moll. 388030, paratypes (5 pv) collection H.P. Wagner (1313). Type locality: Philippines, Bohol, Panglao, 80-150 m, alive, in tangle nets, 1985.
Material examined. — Philippines: PMBP 2004, Stn L42, 80-90 m, 2 pv (A); L46, 90-110 m, 98 pv (A), 7 v; Stn L49, 90 m, 6 v; Stn L65-68, 55-81 m, 49 pv (A), 46 v; Stn L69-73, 90-98 m, 67 pv (A), 16 v; Stn L74-75, 120-139 m, 46 pv (A); Stn L 76, c. 80 m, 4 pv (A), 18 v; Stn P3, c. 100 m, 2 pv (A); Stn P4, 80-120 m, 2 pv (A); Stn T1, 83-102 m, 28 pv (A), 16 v; Stn T4, 82 m, 2 pv (A), 7 v; Stn T11, 78-95 m, 1 pv (A), 2 v; Stn T29, 77-84 m, 2 pv (A); Stn T36, 95-128 m, 1 v; Stn T38, 80-140 m, 5 pv (A); Stn T44, 83-86 m, 1 pv (A). PANGLAO 2005, Stn CP 2407, 256-268 m, 1 v.
Description. — Shell thin, up to c. 30 mm high, most specimen smaller, subcircular to oblique, somewhat higher than wide, weakly inflated, right valve slightly more convex than left valve, inequivalve, inequilateral, auricles strongly unequal, umbonal angle 95˚, brightly creamy, yellowish orange or pink coloured with spots, blotches and/or v-shaped streaks, sometimes uniformly coloured, right valve paler. Left valve sculptured with 26-30 somewhat irregularly spaced, weak squamous radial lirae, of which 6 more prominent. Anterior auricle with about 10 radial riblets, posterior 4. Right valve with about 30 radial ribs, more equally of prominence. Anterior and posterios auricles with 5 radial riblets each. Byssal notch rather broad. Active ctenolium with 5-6 teeth.
Distribution. — Tropical Indo-West Pacific from the Philippines and Indonesia, westwards into the Indian Ocean to Thailand, and eastwards into the Pacific to the Fiji Islands (ZMA, unpubl. data; Raines & Poppe, 2006: 200). Present specimen from the Philippines alive at 80-120 m (minimum depth range). Living amongst coral rubble or gravel on sandy bottoms. Remarks. — The present specimens from the Philippines are morphologically similar to the type specimen.» DIJKSTRA, H. H. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32. [p. 66, 68]
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Laevichlamys gladysiae (Melvill, 1888); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, Philippine Islands, plate 18, figures 1a-1d; plate 20, figures 2a, 2b (juvenile).
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DISTRIBUTION. — Philippines and Indonesia (Dijkstra 1991: 3t); live in 45-180 m (Dijkstra, unpubl. data). New records for the Solomon Islands and Fiji. Present material live in 104-135 m.
DESCRIPTION. — Shell up to c. 25 mm in height, thin, elongate, compressed, inequivalve and inequilateral, oblique posteriorly, right valve slightly more convex than left valve, audcles unequal in s2e, umbonal angle 90°-95°, colour highly variable: uniform orange, red, pink, purple or brown with blotches and V-shaped streaks.
Left valve with 29 squamous lirae of which 6 are more prominent, preradial microsculpture granular, commarginal lamellae on flanks of primary ribs and antimarginal sculpture anteriorly and posteriorly in early ontogeny, absent in late ontogeny. Anterior auricle with 8-10 scaly radial riblets, posterior auricle with 4 rather weak riblets. Right valve almost identical in sculpture to left valve. Byssal notch broad, ctenolium well-developed with 6 teeth. Resilium small and slender. REMARKS. — The present material is indistinguishable from the type specimens of Chlamys elsae from the Philippines.
This species was provisionally placed in Coralichlamys lredale, 1939 by Wagner (1988: 39) and in Laevichlamys by Dijkstra & Kastoro (1997: 282). However, the monotypic coral dwelling Coralichlamys is irregular in shape and has secondary commarginal sculpture, while Laevichlamys has very weak and low radial sculpture (commarginal sculpture lacking) and some species have shagreen microsculpture in the early growth stage. The morphological characters of the present species are closer to those of Talochlamys (see diagnosis of Talochlamys, above, and the description of the present species). DIJKSTRA, H. H. & P. MAESTRATI. 2008. New species and new records of deep-water Pectinoidea (Bivalvia: Propeamusiidae, Entoliidae and Pectinidae) from the South Pacific. In: V. Héros, R. H. Cowie & P. Bouchet (Eds.), Tropical Deep-Sea Benthos 25. Mémoiresdu Muséum national d'Histoire naturelle, 196: 77-113, figs. 1-55. Paris. [p. 107]
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Talochlamys gladysiae (Melvill, 1888) comb. nov.; H. H. Dijkstra & P. Maestrati, 2008, New species and new records of deep-water Pectinoidea from the South Pacific, figures 48, 49.
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