Mimachlamys gloriosa (Reeve, 1853)
REEVE, L. A. 1852-1853. Monograph of the genus Pecten.
In: Conchologia Iconica: or illustrations of the shells of molluscous animals ,
vol. 8. London [unnumbered
pages], pls. 1-35. [pl. 30, fig. 134a-b (errata: nobilis in text)]
1853 Pecten gloriosus Reeve, 1853
1853 Pecten testudineus Reeve, 1853
1853 Pecten reticulatus Reeve, 1853
1853 Pecten prunum Reeve, 1853
1939 Mimachlamys subgloriosa Iredale, 1939
1853 Pecten testudineus Reeve, 1853
1853 Pecten reticulatus Reeve, 1853
1853 Pecten prunum Reeve, 1853
1939 Mimachlamys subgloriosa Iredale, 1939
L. A. Reeve, 1853, plate 30.
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«PECTEN NOBILIS. Pec. testa subrbiculari, compresso-convexa, aequilaterali, aequivalvi, costis duabus et viginti radiata, costis anticis tenuisquamatis, interstitiis subtiliter serrato-liratis, costis lateralibus versus umbonem squamatis, squamis subremotis, erecto-muricatis; albida, purpurascente-fusco tincta et variegata, interdum intense crocea; auriculis inaequalibus, plus minus squamatis.
THE NOBLE PECTEN. Shell nearly orbicular, compressly convex, equilateral, equivalve, rayed with two-and-twenty ribs, anterior ribs thinly scaled, interstices finely serrately ridged, lateral ribs scaled towards the umboes, the scales being rather distant and erectly prickly; whitish, tinged and variegated with purplish-brown, sometimes deep saffron-yellow; ears unequal, more or less scaled. Hab. Moreton Bay, Australia; Strange. This fine species, from Moreton Bay, is perfectly distinct from any other hitherto known, though not distinguished very strikingly in general aspect.» LOVELL AUGUSTUS REEVE, 1853
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«Description. — Shell up to c. 120 mm high, most specimens smaller, inflated, juvenile elongate, adult subcircular, equivalve, equilateral, left valve slightly more convex than right, auricles highly unequal, umbonal angle c. 80˚-85˚; most specimens dark brick red with paler maculations. Both valves sculptured with 22-23 evenly spaced primary radial costae bearing widely set scales, with secondary squamose interstitial riblets near ventral margin (absent in juveniles). Interstitial microsculpture of irregular antimarginal scratches, weakly developed on central part of disc, more prominent near posterior margin. Anterior auricle of left valve with c. 8 scaly radial riblets; of right valve with 5-6 more prominent riblets. Posterior auricle of left valve with similar sculpture to anterior, although weaker and with fewer riblets. Hinge line straight. Resilium triangularly oblong. Byssal notch deep, byssal fasciole rather broad. Functional ctenolium well-developed, with c. 5 teeth. Internal rib carinae prominent marginally, commencing in early growth stage. Resilial and dorsal teeth prominent.
Distribution. — Tropical western Pacific, from southern Japan, southwards to the Philippines, Indonesia and northwestern, northern and northeastern Australia, westwards into the Indian Ocean to Thailand, eastwards into the Pacific to Tonga (Raines & Poppe, 2006: 272). Bathymetric range of live-taken specimens intertidally to 60 m (ZMA, unpubl. data). Living byssally attached to rocks or coral, or amongst coral rubble on soft sediments (sand and/or mud). Remarks. — The present specimens from the Philippines is morphologically similar to the type material. Juveniles of M. gloriosa and M. sanguinea could be easily mixed. Both species are similar brightly coloured, but M. gloriosa is weaker inflated, more higher than wide, and more coarsely sculptured with more widely spaced scales on the radial lirae. Mimachlamys gloriosa also closely resembles M. crassicostata (G.B. Sowerby 2nd, 1842), from northern Chinese and Japanese waters. The present species can be distinguished from M. crassicostata by its smaller size (M. gloriosa up to c. 120 mm in height, M. crassicostata up to c. 140 mm), its different sculpture (M. gloriosa c. 22 costae with secondary riblets in late growth stage; M. crassicostata c. 24 costae lacking intercostal secondary sculpture), and its colour (M. crassicostata is more brightly coloured).» 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. 92, 93]
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Mimachlamys gloriosa (Reeve, 1853); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, pl. 23, figs. 3a-3d.
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