Pseudentolium corneum (J. Sowerby, 1818)
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. 3, p. 1, pl. 204]
1818 Pecten cornea J. Sowerby, 1818
1835 Pecten semicingulatus Münster in Goldfuss, 1835
1864 Pecten semperi Deshayes, 1864
1869 Pecten bellardii Mayer-Eymar, 1869
1835 Pecten semicingulatus Münster in Goldfuss, 1835
1864 Pecten semperi Deshayes, 1864
1869 Pecten bellardii Mayer-Eymar, 1869
J. Sowerby & J. de C. Sowerby, 1812-1848, plate 204.
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«SPEC. CHAR. Orbicular, much depressed, smooth; ears small, nearly equal; two obtuse teeth near the ears within each valve.
A THIN fragile shell whose valves are very nearly alike, being both of them very flat and shining: the beak is acute; the ears prominent and well defined; at the base of each within the valves is an oblong blunt tooth: a slight difference observable in the relative position of these teeth points out the two valves most readily. Well preserved individuals retain some traces of the original markings; such are of a deep brown colour with a horn-like transparency on the sides, and of an opaque pale brown from the front to the beak, near which the colours are very distinct: other specimens are altogether of a pale brown colour, these are the most tender.
Found in the Blue Marle stratum below high water mark, at Stubbington, in Hampshire. It has much affinity with Pecten Pleuronectes, but is more slender, and otherways distinct. Perfect specimens are very rare, and difficult to preserve; I am therefore much obliged to Mr. Holloways for the pains he has taken to procure me such as exhibit clearly all the characters.» JAMES SOWERBY, 1818
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«The new tribe Pseudentoliini is defined as a monophyletic group of genera rooted in "Eburneopecten" frontalis (Dall, 1898) (Appendix Note 2) of late Paleocene (Selandian, Thanetian) age in the North Atlantic. As presently understood, evolution from this root led successively through a series of morphologies represented by Pseudenlolium corneoides (Harris, 1919), Pseudentolium corneum (J. Sowerby, 1818), and a succession of species in the genus Korobkovia Glibert and van de Poel, 1965. From the beginning of the Ypresian, the tribe was, so far as known, restricted to the seas of Europe and Asia and remained restricted to the Northern Hemisphere until its extinction at the end of the Pliocene.»
WALLER, T. R. 2006. New Phylogenies of the Pectinidae (Mollusca: Bivalvia): reconciling Morphological and Molecular Approaches. In S.E. Shumway & G.J. Parsons (Ed.) 2006: Scallops: Biology, Ecology and Aquaculture, 1-44. [p. 12]
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«Also similar is the genus Lentipecten Marwick, 1928 [type species L. hochstetteri (Von Zittel, 1864) from the Early Miocene of New Zealand]. This generic name is also applied to North Sea Basin species, e.g. for the Eocene and Oligocene L. corneus (Sowerby, l8l8). Lentipecten differs basicly frorn Capedopecten by the absence of the complicated umbonal sculpture. A 'Camptonectes' microsculpture has never explicitly been mentioned for the type species of Lentipecten. It was placed in the genus Pseudamussium by Park (1905: 485) and Von Ihering (1907: 85), and in Camptonectes by Suter (1914: 43), whereas Von Teppner (1922: 95) classified this species with the genus Amussium. Such a microsculpture is present, however, in the species L. corneus. This was already described by Wood (1861-1871: 39): "Our shell, which is smooth to the naked eye, exhibits under a common hand-glass fine diverging striae, most distinct near the margins of the shell, and in well-preserved specimens they are plainly visible all over."
We could corroborate this in specimens from the Eocene of Belgium (localities Bambrugge, Meldert and Balegem, age Ledian), in which, however, the microsculpture is extremely fine and only visible in low angle light. In this material of Lentipecten corneus the 'Camptonectes' sculpture is considerably finer than in Capedopecten. A further distinct difference between L. hochstetteri and L. corneus is the morphology of the posterior auricle, which is regularly rounded in L. hochstetteri. In L. corneus the transition between the dorsal and posterior margins of the same auricle is distinctly angular. For these reasons it might be necessary to reconsider the generic position of L. corneus.» DIJKSTRA, H. H. & A. W. JANSSEN. 1988. Capedopecten anellus gen. et spec. nov. (Mollusca, Bivalvia: Pectinidae) from the Antewerp Sands (Miocene, Hemmoorian) in Belgium. Basteria, 52: 175-187, figs. 1-8. [p. 178]
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Lentipecten corneus (Sowerby, 1818); H. H. Dijkstra & A. W. Janssen, 1988, Capedopecten anellus gen. et spec. nov. from the Antewerp Sands, figs. 8a, 8b.
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