Semipallium fulvicostatum (Adams & Reeve, 1850)
ADAMS, A. & L. A. REEVE. 1848-1850. Mollusca. In: A. Adams (ed.), The zoology of the voyage of the H.M.S. Samarang under the command of Captain Sir Edward Belcher, C.B., F.R.A.S., F.G.S. during the years 1843-1846. Reeve, Benham & Reeve, London, x + 87 + [ii] pp., pls. 1-24 [p. 74, pl. 21, fig. 11]
A. Adams & L. A. Reeve, 1848-1850, plate 21.
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«2. PECTEN FULVICOSTATUS. PI. XXI. Fig. 11. Pect. testâ subobliquâ, multò altiore quam longâ, inaequilaterâ, albidâ, rubro sparsirn maculatâ, costis fulvis, valvis subaequalibus, tenuibus, compressis, decemcostatis, costis interstitiisque marginem versus elevato-striatis, auriculis valdè inaequalibus.
HAB. Sooloo Archipelago. A very thin shell, rayed with ten broad yellowish ribs, very sparingly red-spotted.»
ARTHUR ADAMS & LOVELL AUGUSTUS REEVE, 1850
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«Habitat. Living in the littoral to sublittoral zones, byssally attached to undersides of coral slabs or boulders or amongst coral rubble on clean sandy bottoms.
Distribution. Tropical Indo-West Pacific, from southern Japan southwards to northern Australia, and eastwards into the central Pacific to the Tuamoto Archipelago. Not recorded from the Indian Ocean (Raines & Poppe, 2006: 242); Japan to Australia, 5–90 m (Huber, 2010: 207); Philippines, 20–62 m (Raines, 2010: 636; Dijkstra, 2013: 85); Indonesia, 75–90 m (Dijkstra, 1991: 39; Dijkstra & Moolenbeek, 2008: 21); Papua New Guinea, 10 m (Dijkstra, 1998a: 38); Vanuatu, intertidal to 24 m (Dijkstra & Maestrati, 2012: 401). Maximum depth range of live-taken specimens is from the intertidal zone to 90 m. Present specimens from Australia alive in the subtidal zone to 20 m.
Remarks. The present specimens from Australia are almost indistinguishable from the type material of Semipallium fulvicostatum, although more colourful. Juveniles of Semipallium fulvicostatum could easily be confused with juveniles of S. flavicans and S. dringi. All these species live in similar habitats. The differences between these three species are shown in Table 6.»
DIJKSTRA, H. H. & A. G. BEU. 2018. Living scallops of Australia and adjacent waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae). Records of the Australian Museum, 70 (2): 113-330, figs. 1-102. [p. 267]
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Semipallium fulvicostatum (A. Adams & Reeve); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 80H, 80I.
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«Type data. — Pecten fulvicostatus Adams & Reeve: Holotype (H 24.5 mm, pv) BMNH 1950.11.14.31 (see Wagner, 1989b: 112, fig. 1). Type locality: “Sooloo Archipelago” [Philippine Islands, Sulu Archipelago].
Pecten luculentus Reeve: Lectotype (H 41 mm, pv) BMNH 1984046/1 (see Wagner, 1989b: 112, fig. 2). Type locality: Australia, Northern Territory, Bathurst Island. Material examined. — Philippines: PMBP 2004, Stn L51-60, 43-62 m, 1 pv (A); Stn S8, 28-32 m, 1 v; Stn S21, 4-12 m, 19 v.
Additional material examined. — Tawi-Tawi Island, 26-30 m, alive, 2 pv (ZMA Moll. 144544); N of Jolo Island, Bangas Island, 12-15 m, alive, 5 pv (ZMA Moll. 144546); Off Pilas Island, 20-30 m, alive, 24 pv (ZMA Moll. 144547); Olango Island, Ziczac Point, 15 m, alive, 1 pv (ZMA Moll. 146791); Balicasag Island, 25-30 m, alive, 2 pv (ZMA Moll. 147217); Panglao Island, 20-30 m, alive, 1 pv (ZMA Moll. 148343). Description. — Shell up to c. 35 mm high, weakly inflated, left valve slightly more convex than right, elongate and prosocline, inequivalve and inequilateral, auricles highly unequal in shape and size, umbonal angle c. 85˚; cream with yellowish costae and darker maculations on left valve, right valve paler, with yellow blotch near umbo. Both valves sculptured with 9 evenly spaced primary radial costae; 5 prominent secondary radial riblets on costae; 3-4 weaker riblets in intercostal spaces near ventral margin. Secondary riblets on right valve bear delicate closely spaced lamellae. Shagreen microsculpture throughout. Anterior auricles larger and longer than posterior ones, bearing 8-10 radial riblets on left valve and 5-6 on right; posterior auricles almost smooth. Byssal notch moderately deep, byssal fasciole broad. Functional ctenolium well-developed, with 5-7 teeth. Internal plicae with carinate riblets near margin. Hinge with weak resilial and dorsal teeth.
Distribution. — Tropical Indo-West Pacific, from southern Japan southwards to northern Australia, and eastwards into the central Pacific to the Tuamoto Archipelago. Not recorded from the Indian Ocean (Raines & Poppe, 2006: 242). Present specimen from the Philippines alive in 43-62 m. Bathymetric range of live-taken specimens is 15-40 m (minimum depth range) (ZMA, unpubl. data). Living byssally attached to undersides of coral slabs or boulders or amongst coral rubble on clean sandy bottoms. Remarks. — The present specimens from the Philippines are morphologically indistinguishable from the type material.» DIJKSTRA, H. H. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32. [p. 84, 85]
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Semipallium fulvicostatum (A. Adams & Reeve, 1850); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, Philippine Islands, plate 22, figures 2a-2d; plate 25, figures 7a, 7b.
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