Dhondtichlamys campaniensis (Orbigny, 1847)
ORBIGNY, A, D'. 1844-1847. Paléontologie francaise. Description des Mollusques Rayonnés fossiles. Terrains crétacés. III. Lamellibranches. Chez Arthus Bertrand, Libraire-Éditeur. Paris [p. 620, pl. 440, figs.12-16]
1847 Pecten campaniensis Orbigny, 1847
1902 Pecten fenestratus Ravn, 1902
1908 Pecten puggaardi Ravn, 1908
1902 Pecten fenestratus Ravn, 1902
1908 Pecten puggaardi Ravn, 1908
A. d'Orbigny, 1844-1847, plate 440.
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«P. testa circulari, depressa, radiatim costata; costis (26) aequalibus, elevatis, transversim sublamellosis, sulcis angustatis; auriculis subaequalibus.
Dimensions. Largeur, 8 millim. — Par rapport à la largeur: longueur, 100/100. — Angle apicial, 109°. Coquille plus longue que large, presque circulaire, déprimée, ornée, dans le jeune âge, de douze, et dans les adultes d'environ vingt-six côtes rayonnantes, bifurquées, le double plus larges que les sillons qui les séparent, assez élevées, et marquées de petites côtes lamelleuses, transverses, surtout vers le sommet de la coquille, où elles passent même par dessus les sillons sans s'interrompre. Rapports et différences. Cette jolie espèce est facile à reconnaître par sa forme arrondie, plus longue que large, et par ses singulières lignes concentriques élevées qui travers sent l'ensemble des cotes et des sillons. Localité. Elle a été recueillie, dans la craie blanche la plus supérieure, à Chavot (Marne), par M. Dutemple. Explication des figures. Pl. 440, fig. 12. Coquille grossie. De la collection de M . Dutemple. Fig. 13. Profil de la même. Fig. 14. Côtes grossies. Fig. 15. Profil des mêmes. Fig. 16. Grandeur naturelle.» ALCIDE D'ORBIGNY, 1847
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«Description. Small, strongly convex shells with a distinctive 'trellis' sculpture, which is best seen on juveniles or on the umbo. Trellis formed by well-developed and divided radial ribs and the slightly elevated concentric growth striae that cross them; various combinations and strengths of this pattern occur at most localities.
Remarks. Distinguished from all other species by its trellis pattern of ornament. M. arlesiensis differs in having undivided and fewer ribs (14-18), and characteristic scaly structures on its ribs; M. pulchellus has a more convex shell. Occurrence. Coniacian-Lower Maastrichtian, O. lunata Zone; relatively rare in Kent and Norfolk.» CLEEVELY, R. J. & N. J. MORRIS. 2002. Introduction to molluscs and bivalves. In A. B. Smith & D. J. Batten (Eds.): Fossils of the Chalk, 99-160. The Paleontological Association. London. [p. 126]
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Microchlamys campaniensis (d'Orbigny); R. J. Cleevely & N. J. Morris, 2002, Introduction to molluscs and bivalves, plate 20, figure 5.
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«Pecten campaniensis D'ORBIGNY = Pecten fenestratus RAVN (= Pecten puggaardi RAVN). Pecten campaniensis as drawn and described by D'ORBIGNY has a predominant radial ornamentation; the specimens figured by RAVN have a radial and concentric ornamentation of the same development and some specimens have a more pronounced concentric than radial ornamentation (4). In most localities specimens of both types are found and also those between the two extremes.
D'ORBIGNY's figures are reconstructions of poorly preserved specimens: fig. 13 does not tally with the reality of the specimens which are convex but the figure shows an almost flattened specimen; the auriculae on fig. 12 have been invented: it is impossible to see how the auricles were on the original specimen which is very poorly preserved. WOODS (1902, p. 193) thinks it is a rare species since he saw only about 12 specimens; however, in some areas the species seems to be abundant: for instance in the Maastrichtian strata in Rugen and in Denmark.» (4) Chlamys (Aequipecten) wisniowski PASTERNAK, 1961 is very probably this extreme of the variability of L. (A.) campaniensis: it has a perfect «trellis» ornamentation (PASTERNAK, 1961 f. 2 and PASTERNAK et al., 1968, text fig. 30, 4) in which the concentric element is slightly more pronounced than the radial one; besides the figured specimens (PASTERNAK et al., 1968, pI. 34, fig. 9-11) have a typical L. (A.) campaniensis shape.
DHONDT, A. V. 1972. Systematic revision of the Chlamydinae (Pectinidae, Bivalvia, Mollusca) of the European Cretaceous. Part 2: Lyropecten. Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, 48 (7): 1-81, pls. 1-3. [p. 12]
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Lyropecten (Aequipecten) campaniensis (A. d'Orbigny, 1847); A. V. Dhont, 1972, Systematic revision of the Chlamydinae of the European Cretaceous, plate 1, figures 1a-1c.
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«Remarks.— This appears to be rather rare species; I have seen only about a dozen of specimens.
Type.— From the Senonian of Chavot (Marne). Distribution.— Uintacrinus zone of Devizes Road, one mile west of Salisbury. Marsupites zone near Winchester. A. quadratus zone of East Harnham near Salisbury, and Winchester. B. Mucronata zone of Clarendon near Salisbury, and of Norwich. Upper Chalk of Guildford. Chalk of Trimingham» WOODS, H. 1902-1903. A monograph of the Cretaceus Lamellibranchia of England. Vol. I. Paleontological Society Monograph. Part IV Pectinidae, pp. 145-196 (1902); Part V Pectinidae (continued), pp. 197-232(1903). The Paleontographical Society (First reprinting, 1975: Vol. 56 nº 264 and Vol. 57 nº 267). [p. 193]
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Pecten (Aequipecten)
campaniensis d'Orbigny; H. Woods, 1902-1903. A monograph of the Cretaceus Lamellibranchia of England, Vol. I, plate 37, figures 4-8. |