Decatopecten amiculum (Philippi, 1851)
PHILIPPI, R. A. 1851. Centuria quinta Testaceorum novorum. Zeitschrift für Malakozoologie, 8 (6): 81-96. [p. 89]
1851 Pecten amiculum Philippi, 1851
1852 Pecten flabelloides Reeve, 1852
1909 Pecten helleri Preston, 1909
1852 Pecten flabelloides Reeve, 1852
1909 Pecten helleri Preston, 1909
Decatopecten amiculum (Philippi, 1851); B. K. Raines & G. T. Poppe, 2006, A Conchological Iconography, The Family Pectinidae, plate 43, figures 1-7.
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«P. testa subaequivalvi, subaequilalera, radiatim costata, et profunde striata, versus apices planata, albo et purpureo varia; costis novem ad decem; auriculis obliquis subaequaiibus; cardine dentato; pagina interna valide costata, circa circum ferrugineo-fusca. Alt. 16½'''; long, totidem vel minor; crass. 4⅔ —8'''.
Patria: Madagascar. Specimina duo contuli, unum compressum, angustum, collectionis meae, alterum latius, covexum coll, cl. Largilliert. Species quam maxime affinis P. plicae, testa versus apices compressa, dentes cardinis, zona fusca ante marginem paginae internae, striae profundae radiantes etc. idem, sed numerus costarum duplex. Valva dextra seu superior minus convexa, purpurea albo maculata, valva inferior magis convexa, alba punctis maculisve minoribus purpureis adspersa. Valvae tarn arcte clauduntur, ut byssum nullum ab animale emitti censeam, neque ullum ciliarum vestigium in sinu pro bysso destinato video.» RUDOLPHUS AMANDUS PHILIPPI, 1851
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«Description
Moderately large (Lmax = 50.2 mm), suborbicular, biconvex, equivalve, equilateral, slightly higher than long, with weakly-inflated valves and central umbones. The anterolateral and posterolateral margins are shallowly-concave, forming an apical angle of 80-85º, and the ventral margin is strongly convex. There are 5-8 low gently-convex ribs which broaden ventrally and are generally wider than the shallow interspaces, but much narrower on DNSM-PQZ5860. The entire shell surface is finely lirate, with up to 10 lirae per rib at midlength. The lirae split into finer threads close to the ventral margin in mature shells. The small auricles are of similar size, that to the posterior slightly larger, and are ornamented with up to 11 fine radial lirae. There is no byssal notch. Discussion
Suborbicular outline and numerous broad low rounded ribs serve to distinguish D. amiculum from D. plica (Linné) and D. radula (Linné). The former is reported from the Kenya (Cox 1930). This is a tropical Indo-Pacific species whose southern limit in northernmost KwaZulu-Natal (Kosi Bay) where it is recorded from 40-50 m depth (Dijkstra & Kilburn 2001).» COOPER, M. R. 2014. The Cainozoic palaeontology and stratigraphy of KwaZulu-Natal. Part 5. The False Bay Coral Limestone Formation. Stratigraphy and fauna. Durban Natural Science Museum Novitates, 37: 7-24, figs. 1-7. [p. 11]
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Decatopecten amiculum (Philippi); M. R. Cooper, 2014, The Cainozoic palaeontology and stratigraphy of KwaZulu-Natal. Part 5. The False Bay Coral Limestone Formation. Stratigraphy and fauna, figures 2F-2H.
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«Remarks; The present species was already illustrated by Nomura and Zinbo (1933) from the Nakoshi Sand in Okinawa as also same of Noda (1988a). The species is defined by subcircular shell, round-topped 7-9 radial ribs, fine radial riblets in right valve and interribs on the intemal margin, very fine ventral crenulations and paired internal ribs at inner ventral margin and no byssal notch. The present species resembles Decatopecten striatus in their similar radial ribs and sheil form but the number of radial ribs is larger.»
H. NODA. 2002. Molluscan fossils from the Ryukyu Islands, Southwest Japan – Part 4, Gastropoda and Pelecypoda from the Nakoshi Formation in the Motobu Peninsula, Okinawa-jima –. Science Reports of the Institute of Geosciences, University of Tsukuba [Section B], 23: 53-116, figs. 1-20. [p. 69]
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Decatopecten amiculum (Philippi, 1851); H. Noda, 2002, Molluscan fossils from the Ryukyu Islands, figures 9.1, 9.2, 9.4, 9.5.
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«Distribution: Red Sea, Gulf of Aden, east coast of Africa to Natal (South Africa), Persian Gulf, extending eastwards to the Philippines and Indonesia. Littoral to sublittoral depths, living free on soft substrates.
Remarks: The present species differs mainly from the closely related species Decatopecten plica (Linnaeus, 1758) by having more weakly developed radial plicae (7-11). which are usually more compressed. For description of the present species see Rombouts (1991: 36) and Oliver (1992: 77).» DIJKSTRA,
H. H. & J. KNUDSEN. 1998. Some Pectinoidea (Mollusca: Bivalvia:
Propeamussiidae, Pectinidae) of the Red Sea. Molluscan Research, 19 (2):
43-104, pls. 1-10. [p. 55]
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Decatopecten amiculum (Philippi, 1851); H. H. Dijkstra & J. Knudsen, 1998, Some Pectinoidea of the Red Sea, pl. 9, figs. 42, 43.
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