Dhondtichlamys pulchella (Nilsson, 1827)
NILSSON, S. 1827. Petrificata Suecana. Formationis Cretaceae. viii, 37 p., pls. 1-10. Londini Gothrum, Ex Officina Berlingiana. [p. 22, pl. 9, fig. 12]
1827 Pecten pulchellus Nilsson, 1827
1827 Pecten lineatus Nilsson, 1827
1833 Pecten spurius Münster in Goldfuss, 1833
1833 Pecten miscellus Münster in Goldfuss, 1833
1850 Pecten staszycii Alth, 1850
1911 Pecten submiscellus Vogen von Falkenstein, 1911
1827 Pecten lineatus Nilsson, 1827
1833 Pecten spurius Münster in Goldfuss, 1833
1833 Pecten miscellus Münster in Goldfuss, 1833
1850 Pecten staszycii Alth, 1850
1911 Pecten submiscellus Vogen von Falkenstein, 1911
S. Nilsson, 1827, plate 9.
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«P. testa orbiculari, depresso-convexa, radiatim costata; costis latiusculis, plano-convexis, subfissis, subtiliter striatis; striis in media testa longitudinalibus, ad latera obliquis, arcuatis; auriculis inaequalibus virgato-striatis. Diam. 10-14 mm. (Tab. nostra IX. fig. 12.)
Descript. Inter minores sed pulcherrimos Pectinites formationis cretaceae. Saepe testa alba, & nitida obvenit, fasciis transversis rubescentibus ornata. Fere orbicularis est & parum coqvexa, radiatim costata; costae 22-24 satis latae, parum convexae, interdum fissae, subtiliter & pulchre striatae. Sulci intercostales angustissimi. Striae in media testa longitudinales sunt, sed in lateribus oblique & sub auriculis arcuatim transverse eurrunt. Auriculae inaequalissimae, radiatim striatae. Obs. In quibusdam speciminibus lumini obversis & per lenticulam observatis, inspiciuntur quoque striae costarum transversae; in quibusdam hae solae, observantur. Locus: In arena viridi ad Köpingemölla frequens & bene conservata occurrit. In calce arenosa & carbonifera ejusdem regionis quoque obvenit, nec non in stratis conchaceis ad Balsberg, Ignaberga, Kjugestrand & Mörby.» SVEN NILSSON, 1827
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«Description:
Diagnosis.— Lyropecten (Aequipecten) species with a large number (22-60) of radial divided ribs, which are covered with small globular structures lying at regular distances from one another. Right valve:
Left valve:
Discussion
Synonymy:
To what A. HENING, 1897 and H. WOODS,1902 wrote little has to be added. Pecten staszyci ALTZ, as can be seen on the orignal specimen in Vienna, has all the characteristics of a right valve of Lyropecten (Aequipecten) pulchellus. The originals of A. VON STROMBECK and O. GRIEPENKERL are in the Museum of the VON HUMBOLDT Universität in Berlin. The specimens from Sweden of J. DE MORGAN'S collection are in the Muséum national d'Histoire naturelle in Paris. Differentiation: Lyropecten (Aequipecten) pulchellus (NILSSON, 1827) is undoubtedly closely related to L. (A.) acuteplicatus (ALTH, 1850) (see sub acuteplicatus). L. (A.) arlesiensis (WOODS, 1902) has fewer and undivided ribs. L. (A.) subaratus (NILSSON, 1827) has more ribs, auricles with a different macrosculpture, and is more convex. L. (A.) campaniensis (D'ORBIGNY, 1847) is broader and has a better developed concentric ornamentation; the same applies to L. (A.) subinflexus (nom. nov.). L. (A.) sarumensis (WOODS, 1902) has more ribs and differently ornamented auricles. L. (A?) ternatus (MUENSTER in GOLDFUSS, 1833) is larger and has fewer ribs. Generic attribution: The type-species of Aequipecten, Pecten opercularis (LINNAEUS, 1758) is similar to Pecten pulchellus NILSSON, 1827 in the following respects : — broad rounded ribs on the right valve and narrow, elevated ribs on the left valve. — auricle macrosculpture consists in the continuation of striae from the disc and of concentric striae which only exist on the auricles. — general suborbicular shape and very unequal auricles. The main difference between the two species is that Pecten pulchellus has an increasing ribnumber from umbo to pallial margin by division or intercalation. Hence it seems logical to consider the correct name of Pecten pulchellus NILSSON is now Lyropecten (Aequipecten) pulchellus (NILSSON, 1827).» 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. 21-23]
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Lyropecten (Aequipecten) pulchellus (Nilsson, 1827); A. V. Dhondt, 1972, Systematic revision of the Chlamydinae of the European Cretaceous, Part 2: Lyropecten, plate 1, figures 2a, 2b.
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