Lyriochlamys dentata (Nilsson, 1827)
NILSSON, S. 1827. Petrificata suecana formationis cretaceae, descripta et iconibus illustrata a S. Nilsson. Pars prior, vertebrata et mollusca sistens. viii, 37 p., pls. 1-10. Londini Gothrum, Ex Officina Berlingiana. [p. 20, pl. 10, fig. 9]
1827 Pecten dentatus Nilsson, 1827
S. Nilsson, 1827, plate 10.
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«P. testa ovata maxima, convexiuscula, plicato-costata, costis numerosis (36 - 40) medio dentibus serratis, utrinque stria angusta ornatis; & sulco concavo distinctis; auriculis transversim tenuiter striatis (Tab. nostra X. fig. 9.) Longit. 4½; lat. 3½ poll.
Descript. Maxima sui generis species in formatione nostra cretacea obveniens. Quoad formam oblongo ovata parum convexa, depressiuscula, angulo basali acuto. Tota superficies radiatim plicata, plicis circiter quadraginta; quarum singula in medio dorso ornatur serie dentiun serratorum & utrinque stria Iaevi humiliore. Interstitiorum suIci concavi laeves vel longitudinaliter striati. Plicae pagina internae laeves sunt & minus distinctae. Locus: Specimen depictum in ColIectione Retziana Musei Lundensis sine loco asservatur. Petra autem adhaerens & petrificata quaedam parasitica (e. gr. Spirorbis. Glaebella n. &c.) indicare videntur specimen esse a stratis montis Balsberg deportatum. In his stratis aliud multo majus, sed magis fractum ipsi postea legimus.» SVEN NILSSON, 1827
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«Most species of Late Cretaceous Lyriochlamys, such as Pecten dentatus Nilsson, 1827, from the Campanian and Senonian of Europe (Dhondt, 1973) and P. faujasi Defrance, 1825, from the Turonian to Maastrichtian of Europe (Dhondt, 1973), still retain evidence of an extensive inner aragonitic layer. Among poorly preserved specimens such as those found in chalk facies, this evidence commonly consists of a dissolution line that parallels the disk and auricular margins. Dissolution also obliterates any trace of the originally aragonitic hinge teeth and resilifer.»
WALLER, T. R. & L. MARINCOVICH JR. 1992. New species of Camptochlamys and Chlamys (Mollusca: Bivalvia: Pectinidae) from nearthe Cretaceous/Tertiary boundary at Ocean Point, North Slope, Alaska. Journal of Paleontology, 66 (2): 215-227, figs. 1-5. [p. 223]
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«Pecten serratus as figured and described in A. HENNIG, 1897, is a left valve of Pecten dentatus NILSSON. Pecten serratus NILSSON is generally considered to be synonymous with Mimachlamys cretosa (DEFRANCE); whether this is correct can no longer be checked : the original of Pecten serratus LO 67 t cannot be found in the Palaeontological Collections of Lund University.
Whether Pecten dentatus is specifically different from Chlamys faujasi (DEFRANCE) is not easy to decide: both have the same disc and auricle shape, a similar rib-distribution, a similar rib shape and a similar stratigraphical distribution. They differ in : — the rib number (C. faujasi: 25-35, avo 29; C. dentata: 25-44, avo 36); — the rib ornamentation (C. faujasi has smaller spines and more subdivided ribs; C. dentata has large spines and more closely set scales on the left valves); — the geographical distribution (C. faujasi is more widely distributed than C. dentata which is restricted to the Emscher of the Harz and to Swedish Campanian). The differences existing between both species are slight but since there is a geographical and morphological difference it seems best, for practical purposes, to consider both as different species or subspecies.» DHONDT, A. V. 1973. Systematic revision of the Chlamydinae (Pectinidae, Bivalvia, Mollusca) of the European Cretaceous. Part 3: Chlamys and Mimachlamys. Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, 49 (1): 1-134, pls. 1-9. [p. 17, 18]
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Pecten dentatus Nilss.; G. Müller, 1898, Die Molluskenfauna des Üntersenon von Braunschweig und Ilsede, plate 5, figures 3-5. [non figure 4: Pecten faujasii Defrance, 1825; fide A. V. Dhondt, 1973, p. 15]
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