"Aequipecten" deltoidea Cox, 1927
COX, L. R. 1927. Neogene and Quaternary Mollusca from the Zanzibar Protectorate. In Anonymous (Eds.): Report on the Palaeontology of the Zanzibar Protectorate based mainly on the collection made by G. M. Stockley: 13-102, pls. 3-19. Published by Authority of the Government of Zanzibar. [p. 47, pl. 5, figs. 1-3]
1927 Chlamys (Aequipecten) deltoidea Cox, 1927
L. R. Cox, 1927, plate 5.
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(in allusion to its sub-triangular outline.)
«Specific characters:— Shell rather small, compressed, equilateral, subtriangular, the upper margins of the disc of the valve long and straight, making with one another an angle slightly exceeding a right angle; right valve more inflated than the left; both valves with 15-17 prominent costae, separated by rather narrower, somewhat squarel¡channelled interspaces; the costae more or less rounded in cross-section, but each bearing along its crest a faint, sharp ridge with small tubercles; other thread-like longitudinal ridges occurring on the sides of the costa, and in the intercostal spaces; ears sub-equal in each valve, the posterior ones having approximately the shape of right-angled triangles; ears each ornamented with several radial riblets; ctenolium rather inconspicuous; ligament-pit rather wide; crural ridges fairly conspicuous; internal ribs wide, flattened, becoming prominent at the margin.
Localities:— Pemba 1, 47 and 48. Material:— The holotype (L. 43826), a left valve from Loc. 1, and four paratypes. Dimensions:— (Holotype) length ca. 32mm., height 32.7mm., inflation 4mm.; the other specimens are rather smaller. Comparison with other species:— C. deltoidea bears some resemblance to Martin's figures of Pecten tjaringinensis (Samml. Geol. Reichs-Mus. Leiden, n.F., i, p. 351, pl. 1, figs. 54-56), from the Javan Pliocene, but differs from that species in its triangular shape, in its less numerous ribs, and in the rather sharp, tuberculate crest of each rib. It is quite distinct from any living species, as also from any of the Mediterranean Neogene forms.» LESLIE REGINALD COX, 1927
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«Material:— Sample REL.2324 (Zanzibar, in stream between Mtoni and Masingini Ridge; L. Miocene), 5 specimens; sample APT.91 (Zanzibar, P.W.D. excavation W. of road, 3.1 miles N. along road from Tunguu junction; L. Miocene), 5 specimens; sample PEK.5430 (Tanganyika, Mchinga cliff; L. Miocene), 2 specimens; sample APT.256 (Pemba I., 20 ft. cliff on S.W. coast of Pakaima peninsula, 1,900 yds. at 324° from Ras
Domoni; L. Miocene), 5 specimens; sample APT.317 (Pemba I., 1,720 yds. at 132° from Kijiweni Point; L. Miocene), 2 specimens; sample APT.423 (Pemba I.; L. Miocene), 1 specimen; sample RBH.783 (Mafia I., sand-rock point, Kilindoni; L. Miocene), 1 specimen. Remarks:— Previously recorded from the L. Miocene of Pemba I.» EAMES, F. E. & L. R. COX. 1956. Some Tertiary Pectinacea from East Africa, Persia, and the Mediterranean region. Proceedings of the Malacological Society of London, 32 (1): 1-68, pls. 1-20. [p. 43]
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