Semipallium dringi (Reeve, 1853)
REEVE, L. A. 1852-1853. Monograph of the genus Pecten. In: L. A. Reeve (Ed.), 1843-1878, Conchologia Iconica; or illustrations of the shells of molluscous animals, vol. 8. [unnumbered pages], pls. 1-35. London. [sp. 152, pl. 33, figs. 152a-b]
L. A. Reeve, 1852-1853, plate 33.
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«Species 152. (Fig. a, b, Mus. Cuming.)
PECTEN DRINGI. Pect. testâ trigono-ovatâ, altiore quam longâ, subobliquâ, compressâ, inaequilaterali, inaequivalvi, valvis costis octo latiusculis, subdepressis, undique serrato-liratis radiatis; fulvescente, valvâ sinistrâ interdum rufo-nigro punctatâ et variegatâ, interdum intensè violaceâ, rufo umbones versus maculatâ, valvâ dextrâ pallidiore; auriculis valdè inaequalibus, anticis latè obliquè expansis.
DRING'S PECTEN. Shell triangularly ovate, liigher than long, rather oblique, compressed, inequilateral, inequivalve, valves rayed with eight rather broad, subdepressed ribs, which are everywhere serrately ridged; light fulvous, left valve sometimes dotted and variegated with red-black, sometimes deep violet, blotched with red towards the umboes, right valve paler; ears very unequal, the anterior broadly obliquely expanded.
Hab. Bathurst Island, north-west coast of Australia: Dring. A light strongly striated species of rather tliin substance, somewhat obliquely expanded, with the front ear rather large and flexuous. Colouring extremely variable.» LOVELL AUGUSTUS REEVE, 1853
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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 the Philippines southwards to northern Australia and eastwards into the central Pacific to the Marshall and Fiji Islands (Raines & Poppe, 2006: 240); Philippines to Indonesia, 18–56 m (Huber, 2010: 207); Philippines, 7–80 m (Raines, 2010: 634; Dijkstra, 2013: 81); Indonesia (Dijkstra & Moolenbeek, 2008: 21). Maximum depth range of live-taken specimens is 7–80 m. Present specimens from Australia dead at 2–82 m.
Remarks. Semipallium dringi has been identified under different names by several previous authors, before Wagner (1989b) designated a lectotype for Pecten dringi. The type lot includes specimens of two nominal taxa, Semipallium dringi and Complicachlamys wardiana Iredale, 1939. Semipallium dringi was also synonymized with S. fulvicostatum (A. Adams & Reeve, 1850) by Wagner (1989b), but S. fulvicostatum differs from S. dringi by having a more strongly prosocline shape (S. dringi is subcircular), coarser and more prominent shagreen microsculpture throughout (intercostal only in S. dringi), antimarginal microsculpture laterally (lacking in S. dringi), and in its coloration (S. dringi is more polychrome).»
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. 264]
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Semipallium dringi (Reeve; H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 80C, 80E, 80J.
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«Type data. — Pecten dringi Reeve, 1853: Lectotype (H 31.6 mm, pv) BMNH 1950.11.14.28, designated by Wagner (1989b: 114, fig. 5); paralectotypes (2 pv) BMNH 1950.11.14.29-30 (= Complicachlamys wardiana Iredale, 1939). Type locality: Australia, Northern Territory, Bathurst Island.
Semipallium kengaluorum Dijkstra: Holotype (H 22.5 mm, pv) ZMA Moll. 386024, paratypes (8 pv): BMNH 1987056, 1 MNHN Moll 21273, 1 NNM.MOL.55994, 1 USNM 859393 , 4 ZMA Moll. 386025 (2), 386026 (2). Type locality: Solomon Islands, Russell Island, 35 m, alive, byssally attached to cliff face, scuba, leg. J. Kengalu, xii.1982. Remarks. — For information on type material of Semipallium dringi and comparison with S. kengaluorum see Dijkstra (1991: 39). Material examined. — Philippines: PMBP 2004, Stn B9, 8-10 m, 1 v; Stn B10, 3-14 m, 1 v; Stn B12, 24-27 m, 1 pv (A); Stn B16, 20 m, 2 v; Stn B17, 3-21 m, 2 pv (A), 2 v; Stn B20, 2-8 m, 1 pv; Stn B39, 17-25 m, 1 pv (A), 1 v; Stn B42, 30-33 m, 1 pv, 1 v; Stn L76, c. 80 m, 2 pv (A), 1 v; Stn P3, c. 100 m, 1 v; Stn P4, 80-120 m, 1 pv (A), 11 v; Stn R50, 3-7 m, 1 pv (A); Stn R51, 2-52 m, 1 v; Stn R54, 8-10 m, 1 pv; Stn S8, 28-32 m, 7 v; Stn S15, 4-6 m, 1 v; Stn S28, 28-32 m, 12 v.
Description. — Shell up to c. 35 mm high, weakly inflated, left valve slightly more convex than right, subcircular, somewhat higher than wide, almost equivalve and equilateral, auricles highly unequal in shape and size, umbonal angle c. 90˚; colour variable, creamy-orange with purple, yellow or pale cream blotches, right valve paler and with yellow blotch near umbo. Both valves sculptured with 9 evenly spaced primary radial costae; costae each bear 5 prominent secondary radial riblets; 3-4 weaker secondary riblets in intercostal spaces near ventral margin. Secondary riblets on right valve bear delicate, closely spaced lamellae. Shagreen microsculpture present in radial interspaces. Anterior auricles larger and longer than posterior, bearing 8-10 radial costae 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. Hinge with weak resilial and dorsal teeth.
Distribution. — Tropical Indo-West Pacific, from the Philippine Islands southwards to northern Australia and eastwards into the central Pacific to the Marshall and Fiji Islands (Raines & Poppe, 2006: 240). Present specimens from the Philippines alive in 7-80 m (minimum depth range). Living byssally attached to undersides of coral slabs or boulders or amongst coral rubble on clean sandy bottoms. Remarks. — This species has been determined under different names by several previous authors, before Wagner (1989b) designated a lectotype of Pecten dringi. The type lot represents two nominal taxa: S. dringi and Complicachlamys wardiana Iredale, 1939. Semipallium dringi was also synonymized with S. fulvicostatum (A. Adams & Reeve, 1850) by Wagner (1989b), but S. fulvicostatum differs from S. dringi by having a more strongly prosocline shape (S. dringi is subcircular), coarser and more prominent shagreen microsculpture throughout (intercostal only in S. dringi), antimarginal microsculpture laterally (lacking in S. dringi), and in its coloration (S. dringi is more polychrome).» DIJKSTRA, H. H. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32. [p. 57]
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Semipallium dringi (Reeve, 1853); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, Philippine Islands, plate 21, figures 3a-3d; plate 30, figures 3a, 3b.
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«Remarks.— The present immature specimen corresponds very well with the type specimens of S. kengaluorum (ZMA 3.86.024, holotype; NNM, NMNH, BM(NH), USNM, HHD, paratypes) from the Solomon Islands; only the fine spinous sculpture on the radial costae is somewhat coarser, also on the anterior auricular suture.
A close allied species is S. fulvicostatum, which differs by a more elongate shape, and coloration. S. barnetti Dijkstra, 1988 is another similar species, and differs by a more circular outline and irregular radiation. After examination of syntype material of P. dringi I consider the lectotype designated by Wagner (1989) to belong to S. kengaluorum. The lectotype is the specimen figured by Reeve (1853) as fig. 152b, the other figured specimen (fig. 152a) belongs to C. wardiana.» DIJKSTRA, H. H. 1991. A contribution to the knowledge of the pectinacean Mollusca (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae) from the Indonesian Archipelago. Zoologische Verhandelingen, 271: 1-57, figs. 1-91. [p. 39]
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