Laevichlamys squamosa (Gmelin, 1791)
GMELIN, J. F. 1791. Caroli a Linné, Systema Naturae per Regna Tria Naturae, secundum classes, ordines, genera, species, cum characteribus differentis, synonymis, locis. Tomus I. Pars VI. Classis VI. Vermes Species, cum characteribus, differentiis, synonymis, locis. 13th edition, Aucta, Reformata, 3021-3910 p. Impensis Georg Emanuel Beer, Lipsiae [Leipzig], 1791 [p. 3319]
1791 Ostrea squamosa Gmelin, 1791
1791 Ostrea sulphurea Gmelin, 1791
1791 Ostrea anonyma Gmelin, 1791
1926 Chlamys smegmatus Dall, 1926
1939 Mimachlamys grossiana Iredale, 1939
1791 Ostrea sulphurea Gmelin, 1791
1791 Ostrea anonyma Gmelin, 1791
1926 Chlamys smegmatus Dall, 1926
1939 Mimachlamys grossiana Iredale, 1939
M. Lister, 1685-1692, Historiae sive synopsis methodicae conchyliorum, pls. 183-185.
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«squamosa. 17. O. testa oblonga: radiis squamosis; interstitiis latioribus perpendiculariter striatis.
List. Conch. t. 184. f. 21. Habitat - - - testa lineis angulatis maculisque varia: auriculis perpendiculariter rugosis.» JOHANN FRIEDRICH GMELIN, 1791
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«Remarks. The present specimens from Australia are identical to the type material of Laevichlamys squamosa. This species has often been attributed incorrectly to different nominal taxa in the past (see Iredale, 1939: 353) from outside Australia. Therefore, Iredale (1939: 352) considered the Queensland specimens to be distinct. However, the lectotype of Laevichlamys squamosa, Sloane’s specimen (lv) illustrated in Lister (1687), preserved in NHMUK, is morphologically indistinguishable from Iredale’s material of Mimachlamys grossiana.»
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. 245, 246]
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Laevichlamys squamosa (Gmelin); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 71E-71H (71G, 71H , holotype of Mimachlamys grossiana Iredale).
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«Description. — Shell up to 65 mm high, most specimens under 45 mm; thin, flattened, subcircular to oblong, right valve slightly more inflated than left, inequivalve, almost equilateral, auricles highly unequal in size and shape, umbonal angle c. 90˚; colour variable, found in almost all colours, with zigzag pattern, paler radial streaks, and/or blotched, a few specimens uniform in colour. Radial sculpture of left valve irregular in prominence and unevenly spaced, with 9-12 low, coarsely scaly radial riblets; 1-5 weak squamous secondary riblets intercalated in each radial interspace; some specimens with almost smooth interspaces. Sculpture on right valve of more even prominence, with c. 25-35 closely spaced, narrow, squamous radial riblets. Antimarginal microsculpture in interspaces in early growth stage, shagreen microsculpture lacking. Anterior auricles much larger than posterior ones, bearing c. 6 scaly radial riblets, almost smooth on left valve, more prominent on right valve. Posterior auricles smooth or weakly sculptured with a few commarginal lamellae. Byssal notch relatively deep, byssal fasciole broad. Functional ctenolium well-developed, with 5-8 teeth.
Distribution. — Tropical Indo-West Pacific, from southern Japan southwards to northern Australia, westwards into the Indian Ocean to Kenya and Mauritius (not recorded from the Arabian Sea and the Red Sea), eastwards into the central Pacific to Tonga (not known from the Hawaiian Islands or French Polynesia) (Raines & Poppe, 2006: 210). Present specimens from the Philippines alive at 4-38 m (minimum depth range). Bathymetric range of live-taken specimens is intertidal to 80 m (ZMA, unpubl. data). Common in shallow water. Living byssally attached to undersides of rock or coral boulders or amongst coral rubble on soft sediment (muddy sand or sand). Remarks. — The present specimens from the Philippines are identical to the type specimen. This species has often been attributed incorrectly to different nominal taxa in the past (see Iredale, 1939: 353) from outside Australia. Therefore Iredale (1939: 352) considered the Queensland specimens to be distinct. However, Sloane’s specimen (lv), preserved in the Natural History Museum (formerly BMNH) at London, is morphologically indistinguishable.» DIJKSTRA, H. H. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32 pls, 2 tabs. [p. 69, 72]
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Laevichlamys squamosa (Gmelin, 1791); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, plate 19, figures 1a-1d; plate 20, figures 4a, 4b (juvenile).
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