Pecten grandis J. de C. Sowerby, 1828
SOWERBY, J. & J. DE C. SOWERBY. 1812-1846. The Mineral Conchology of Great Britain; or coloured figures and descriptions of those remains of testaceous animals or shells. 7 vols., pls. 1-648 (and 2 bis). London. [vol. 6, p. 163, pl. 585]
1828 Pecten grandis J. de C. Sowerby, 1828
1839 Pecten westendorpianus Nyst & Westendorp, 1839
1857 Pecten maximus var. larvatus Wood, 1857
1957 Pecten subgrandis Glibert, 1957
1965 Pecten praegrandis Glibert & Van de Poel, 1965 [nomen novum pro Pecten grandis J. de C. Sowerby, 1828]
1839 Pecten westendorpianus Nyst & Westendorp, 1839
1857 Pecten maximus var. larvatus Wood, 1857
1957 Pecten subgrandis Glibert, 1957
1965 Pecten praegrandis Glibert & Van de Poel, 1965 [nomen novum pro Pecten grandis J. de C. Sowerby, 1828]
J. Sowerby & J. de C. Sowerby, 1812-1846, plate 585.
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«SPEC. CHAR. Suborbicular, wider than long, concentrically striated, furnished with thirteen much elevated, rounded, more or less compound rays, each of which has generally a sulcus along its middle, and between each is a single secondary ray; one valve rather convex, towards the beak concave, the other very convex ; ears nearly equal, square.
A LARGE Pecten, in general shape resembling P. maximus, but diflfering in the form and structure of the rays. The concentric striae, as in P. maximus, are very irregular, and but little elevated upon the convex valve, while upon the other they are very regular, close, and raised into sharp laminae: the rays upon the convex valve especially are more elevated and deeply divided or sulcated, approaching to the form of those of P. Jacobaeus, but differing from them in being much smoother and rounder. The Rev. G. R. Leathes, to whose liberality I am indebted for a series of specimens of this species, has "selected the trivial name grandis for it;— not but that there are several fossil species found much larger, but as approximating to maximus, given to our common Escallop." Occurs at Ramsholt in a native bed, and Newbourn, and in various other parts of the Suffolk Crag.» JAMES DE CARLE SOWERBY, 1828
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«According to VAN REGTEREN ALTENA et al. (1966) the name Pecten grandis J. DE C. SOWERBY (1828) is not preoccupied by Pecten grandis (SOLANDER), because the last was a nomen nudum for the species now known as Placopecten magellanicus (GMELIN, 1791). The new names given by GLIBERT (1957) and GLIBERT & VAN DE POEL (1965) are therefore unnecessary. A related species with a more tumid light valve and without secondary radial ornament, Pecten praebenedictus (TOURNOUËR in DOLLFUS & DAUTZENBERG, 1920), occurs in the Antwerp Sand Member. Pecten westendorpianus NYST & WESTENDORP, 1839, differs from Pecten grandis by the fewer primary ribs (eight to nine), the srnaller, rnore rounded and convex shell and the lack of secondary, ontatneut in the intercostal areas. The variability of P. grandis in this respect is however large, as can be seen on the figures of the Kattendijk Formation basal gravel specimens: plate 20, fig. 2a and b represent a specimen with narrow ribs, c and d with broad ribs on the flat valve. Their rib number is low (8 or 9), but the shells are more flattened than those of the other Kattendijk specimens and secondary ornament is present in the intercostal spaces. On the other hand, extremely tumid specimens with more ribs also occur. Therefore, Pecten westendorpianus is considered here only as an extreme form in the variability of P. grandis.»
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: 99 pp., 34 plates. [p. 44, 45]
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Pecten grandis J. de C. Sowerby, 1828; R. Marquet, P. Moerdijk & F. A. D. Van Nieulande, 2002, The Neogene Amphineura and Bivalvia, plate 20, figures 1, 2.
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