Pecten keppelianus G. B. Sowerby III, 1905
SOWERBY III, G. B. 1905. Descriptions of seven new species of marine Mollusca from the collection of the late Admiral Keppel. Proceedings of the Malacological Society of London, 6: 279-282, figs. 1-6. [p. 279]
1905 Pecten keppelianus G. B. Sowerby III, 1905
«Testa semiglobosa, aequilateralis, inaequivalvis; auriculis latiusculis, leviter inaequalibus, fere rectangularibus. Valva dextra valde rotundato-convexa, alba, maculis parviusculis, paucis, rosaceis, prope umbonem ornata, concentrice undulatim subrugose laminata; costis circ. 14, latiusculis, angulatis, longitudinaliter trisulcatis, interstitiis concavis. Valva sinistra concave depressa, aurantio-fusca, maculis fuscis et albidis lineisque undulatis variegata, concentrice subtilissime laminata; costis mediocriter latis, longitudinaliter liratis, interstitiis planulatis, lira angusta mediana interruptis.
Lat. 86, alt. 78 mm. Hab.— Ascension Island (?). The shell has just the form of the Californian P. dentatus, Sowerby, which it resembles also in the dentate character of the margin, but the difference, especially of the convex valve, is very apparent; the ribs are less numerous, and instead of being smooth and rounded, as in the last-named species, they are angular and strongly grooved. My type is the only specimen of this species found in Admiral Keppel's collection, and it was labelled Ascension Island. It happens, as a rather curious coincidence, that just at this time two specimens have reached the British Museum from the Cape Verd Islands. The few labels with the late Admiral's shells were loose, and some of them may possibly have been misplaced. It is therefore quite possible that this Pecten may have been collected at Sierra Leone, which is much nearer to the Cape Verd Islands than Ascension. There were in the collection no shells from the Cape Verd Islands, but many from the other two localities mentioned.» GEORGE BRETTINGHAM SOWERBY III, 1905
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«Distribution.— Tropical eastern Atlantic, from Cape Verde Islands, Mauritania southwards to Angola. Living littorally to sublittoral depths on soft sediments (sand, mud). Depth range of present material 12-1200 m, living at 12-80 m.
Description.— Shell up to c. 80 mm in height, solid, orbicular (uvenile), suborbicular (adult), wider than high, inequivalve, nearly equilateral. Left valve slightly concave. Right valve strongly convex. Auricles subequal in size; umbonal angle c. 105°. Both valves sculptured with 10-12, regularly arrarrged, primary prominent radial costae, laterally weak, small and highly rounded to angular on left valve, broad low angular on right valve. Primary ribs with 1-3 delicate grooves. Interstitial secondary radial riblets commence on central part of left valve and increase to ventral margin. Microsculpture of commarginal lamellae between ribs (widely spaced) and on auricles (closely spaced). Hinge line straight. Byssal notch very weak. Active ctenolium absent. Colour left valve orange to deep red with creamy maculations near umbo and on primary ribs, right valve paler to whitish. Remarks.— The present species is close to P. jacobaeus, but smaller (up to c. 80 mm high) and differs in having more angulated radial ribs with interstitial secondary riblets on the left valve (highly rounded of P. jacobaeus with very weak interstitial secondary riblets) and a more convex right valve with weaker angulated radial ribs. Present fossil specimens of P. jacobaeus from the Azores are of exceptionally large dimension (over 200 mm wide).» DIJKSTRA, H. H. & J. GOUD. 2002. Pectinoidea (Bivalvia, Propeamusidae & Pectinidae) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern region of the North Atlantic Ocean. CONCAP-Project contribution Nº 127. Basteria, 66: 31-81, figs. 1-77. [p. 64]
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Pecten keppelianus G.B. Sowerby 3rd, 1905; H. H. Dijkstra & J. Goud, 2002, Pectinoidea collected during the Dutch CANCAP and MAURITANIA expeditions, figures 63-66.
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