Aequipecten radians radians (Nyst & Westendorp, 1839)
NYST, P. H. & G. D. WESTENDORP. 1839. Nouvelles recherches sur les coquilles fossiles de la province d'Anvers. Bulletins de l'Académie Royale des Sciences et Belles-Lettres de Bruxelles, 6 (7): 393-414 [p. 407, pl. 3, fig. 19]
1839 Pecten radians Nyst & Westendorp, 1839
«Two Miocene species were, mostly after ROGER (1939), considered synonyms of Aequipecten radians (NYST & WESTENDORP, 1839). while they clearly differ from this taxon. Aequipecten liberata (COSSMANN & PEYROT, 1914), a species occurrirrg in the Aquitanian, Burdigalian and Sallomacian fron Aquitaine and the Pontilevian from Touraine (both France) is clearly characterized by the higher nunrber of primary ribs. which are, as in Aequipecten opercularis (LINNAEUS, 1758) each composed of a number of secondary ones; these ribs are as broad as the intercostal spaces; on the radial ribs, scales are present instead of spines, specimens with heavier primary ribs are lacking, the shell can become larger than that of A. radians. The general shape is however nearly the same as in A. radians and the shell is also flattened. For the other characters, however, the species comes closer to Aequipecten opercularis (LINNAEUS, 1758). Another member of the same group is Aequipecten assimilatus (MILLET, 1866), which occurs in the Redonian of Brittany and the Pontilevian of Touraine, both France. DOLLFUS & DAUTZENBERG (1920) called this material wrongly "Pecten (Aequipecten) seniensis LAMARCK"; ROGER (1939), GLIBERT & VAN DE POEL (1965) and LAURIAT-RAGE (1981) used the name radians for it. Obvious differences are the higher number of radial ribs (about twenty), the narrower intercostal spaces, the much finer concentric omament, mostly without spines or scales on the radials, the much more tumid shell and the absence of specimens with stronger radial ornament. Here, it is considered a subspecies of A. radians. BEN MOUSSA (1994) identified specimens from the Messinian (Late Miocene) from Morocco as A. radians. His figured material possesses only 13 radial ribs and a shape, completely different from that of A. radians.»
MARQUET, R., P. MOERDIJK & F. A. D. VAN NIEULANDE. 2002. The Neogene Amphineura and Bivalvia (Protobranchia and Pteromorphia) from Kallo and Doel (Oostvlaanderen, Belgium). Paleontos, 2: 1-99, pls. 1-34 plates. [p. 55]
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Aequipecten radians radians (Nyst & Westendorp, 1839); R. Marquet et al., 2002, The Neogene Amphineura and Bivalvia from Kallo and Doel, plate 27, figure 1.
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