Karnekampia gilchristi (G. B. Sowerby III, 1904)
SOWERBY III, G. B. 1904. Mollusca of South Africa (Pelecypoda). Marine Investigations in South Africa, 4: 1-19 [p. 1, pl. 6, fig. 6]
1904 Chlamys gilchristi G. B. Sowerby III, 1904
G. B. Sowerby III, 1904, plate 6.
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«Shell nearly orbicular, equivalve, thin, semitransparent, compressed, pale pinkish yellow; auricles unequal, the posterior the smallest. Left valve very slightly convex, rayed with about nine very slightly raised ribs, about 70 slightly imbricated riblets or lirae, and numerous very close rough intervening striae; anterior auricle rather broad, rectangular, with six narrow rather prominent ridges, crossed by foliated lamellae, the interstices being peculiarly corrugated ; posterior auricle smaller, morenumerously and less prominently ridged, the decussating lamellae imbricated, and the corrugation more definite and oblique; umbones acute. Right valve rather more convex, radiating ribs broader and flatter, and with concentric imbricated lamellae becoming somewhat prominent towards the margin; anterior auricle strongly imbricated, the lamellae being irregularly raised on the upper margin; posterior auricle with ridges closely armed with nodules or short blunt spines. Interior of the valves suffused with golden orange colour. Ligamentary pit small, triangular.
Height, 35; width, 35; depth, 8 millim. Hab.: — Vasco da Gama, False Bay, N. 71º E, 18½ miles; depth, 230 fathoms ; bottom, stones. Of this beautiful species only one specimen has come to hand. The shell is of a very light, semitransparent substance, delicately tinted, having somewhat the general aspect of the C. Septemradiatus of the northern seas, but more numerously ribbed. The entire surface is roughened by close-set, imbricated ridges and fine striae, and the auricles are elaborately sculptured, particularly the posterior of the left valve, which, in addition to the imbricated cross bars, shows a peculiar arrangement of oblique granose striae.» GEORGE BRETTINHAM SOWERBY III, 1904
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«Description: Shell up to ca. 35 mm high, suborbicular, RV somewhat more convex than LV, equilateral, auricles unequal, umbonal angle ca. 90º. LV sculptured with 8 rounded primary radial lirae, RV with 9 broader and flatter primary radial lirae and numerous granulose secondary radial ribs (LV with 3 on main ribs, 4 interstitial; RV with 5 on main ribs, 2 interstitial) with very fine and close-set radial riblets near ventral margin, covered with a periostracal layer (often damaged in adult stages). Microsculpture in early ontogeny of antimarginal striae, more prominent near anterior and posterior margins. Anterior auricle of LV with 4–6 lamellose radial and concentric ribs (cancellated in early ontogeny), on posterior with 3–4 weaker granulose radial riblets. Hinge line straight. Byssal fasciole rather broad, byssal notch narrow, active ctenolium with 5–7 teeth on suture. Auricular crura small, resilifer triangular. Colour orange or pinkish, internally glossy orange-yellow or reddish-orange.
Type material: Holotype SAM 14853 (seen by HD). Regional data (all NMSA unless otherwise stated): NAMIBIA: off Walvis Bay, ca. 200 m, trawled, attached to old netting & ropes, live (K3888: S. Whatmough). SOUTH AFRICA: Atlantic Cape: off Cape Columbine, trawled, dead (B6700: R. Cruickshank); 26 km W of Kleinzee (S of Port Nolloth), 130 m, dead (E7221: J. Pether); 31º14'S; 16º36'E, 272 m (SAM). Unconfirmed: Agulhas Bank: off Port Elizabeth, 200 m, trawled in mud balls, dead (E3100: S. Whatmough). Distribution: Continental shelf of Namibia and Atlantic Cape. Habitat: Bathyal depths (ca. 130–420 m), substrate not established. Remarks: Wagner (1988: 42) referred P. gilchristi to his new genus Karnekampia, whose characters essentially agree with those of Pseudamussium.» DIJKSTRA, H. H. & R. N. KILBURN. 2001. The family Pectinidae in South Africa and Mozambique (Mollusca: Bivalvia: Pectinoidea). African Invertebrates, 42: 263-321. [p.272]
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Pseudamussium gilchristi (Sowerby, 1904); H. H. Dijkstra & R. N. Kilburn, 2001, The family Pectinidae in South Africa and Mozambique, figures 5, 6.
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