Lyriochlamys faujasi (Defrance, 1825)
DEFRANCE, J. L. M. 1825. Peigne. In: F. Cuvier ed. Dictionnaire des Sciences Naturelles, vol. 38: 251-268. [p. 265]
1825 Pecten faujasii Defrance, 1825
1842 Pecten puzosianus Matheron, 1842
1847 Pecten marrotianus Orbigny, 1847
1847 Pecten royanus Orbigny, 1847
1963 Chlamys (Chlamys) furcicostata Zazvorka, 1963
1842 Pecten puzosianus Matheron, 1842
1847 Pecten marrotianus Orbigny, 1847
1847 Pecten royanus Orbigny, 1847
1963 Chlamys (Chlamys) furcicostata Zazvorka, 1963
"Cette coquille allongée, comme celles du genre Lime..."; B. Faujas de Saint-Fond, 1799, Histoire Naturelle de la Montagne de Saint-Pierre de Maestricht, plate 24, figure 5.
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«PEIGNE DE FAUJAS; Pecten Faujasii, Def., Hist. de la mont. de Saint-Pierre de Maëst., pl. 24, fig. 5. Coquille alongée, aplatie, à oreilles inégales, portant sur chaque valve trente côtes écailleuses etstriées longitudinalement. Longueur, deux pouces. On la trouve dans la couche craieuse de la montagne de Saint- Pierre de Maëstricht.»
JACQUES LOUIS MARIN DEFRANCE, 1825
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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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«Synonymy:
GOLDFUSS, 1833, described and figured a large right valve; his figure is more complete than his specimens and his additions were not all fortunate: the auricles as drawn by him are too broad and too short. The ribprofile (fig. 7b) is from the posterior half of a right valve. GOLDFUSS did not possess any left valves. VOGEL, 1895, discussed Pecten faujasi in detail: he demonstrated the difference in macrosculpture between small and large valves. As he suggested, what he described as Pecten (Chlamys) spec. is the, till then, unknown left valve of Chlamys faujasi. For Pecten puzosianus MATHÉRON I adopt the interpretation of F. ROMAN and P. MAZERAN, 1920. According to MATHÉRON's description and figures and to those by these former authors as well, there is no doubt as to the identity of this taxon with C. faujasi. However, not all localities indicated by MATHÉRON are possible for C. faujasi and thus it is probable that the specimens from Tournai, Belgium, belong in fact to C? elongata (LAMARCK). The description by H. WOODS based on a figure in D'ORBIGNY concerns another species (see Mimachlamys henrici, n. sp., p. 99). D'ORBIGNY described three taxa (Pecten espaillaci, P. marrotianus and P. royanus) which are very similar to C. faujasi: all three have the same shape, tripartite ribs and a ribnumber almost within the variability of C. faujasi. P. marrotianus: D'ORBIGNY does not specify the ribnumber; on the figure I counted 38 which is just outside the variability of C. faujasi; the specimen itself is not very well preserved. P. royanus: ribnumber according to D'ORBIGNY: 26; on the figure it is the same; on the original material counting is almost impossible due to the state of preservation. P. espaillaci: ribnumber according to D'ORBIGNY: 36; on the figure 30; on the original material: 7600 A: right? valve: 25 ribs, left? valve: 24 ribs; 7600 C: 23-24 ribs. This is almost within the variability established for C. faujasi; according to D'ORBIGNY, P. espaillaci has undivided ribs on the right valve and this is not possible in C. faujasi; it should be noted, however, that none of D'ORBIGNY's P. espaillaci specimens has auricles; thus it could be that instead of right valves they are left valves and on C. faujasi left valves have undivided ribs, even if the valves are medium-sized to large. The three D'ORBIGNY's taxa can be considered as being very close and almost certainly in the range of C. faujasi if one takes into consideration their different sizes and sides (left and right valves). In confirmation of this I saw in the Museum d'Histoire naturelle in Geneva a specimen labelled Pecten royanus D'ORBIGNY from Royan. Its state of preservation is much better than on the specimens from the Museum national in Paris and this specimen is undoubtedly a C. faujasi. Pecten royanus as figured and described by ZITTEL, 1866 (specimens in the Geologische Bundesanstalt in Vienna) forms, in a similar way as the specimens from around Dresden, a transition between Pecten elongatus LAMARCK and C. faujasi (DEFRANCE). Chlamys (Chlamys) furcicostata ZAZVORKA, 1963, seems to be identical with C. faujasi. The differences indicated by ZAZVORKA concern : a) the shape of the byssal sinus, b) the width of the apical angle; for both, ZAZVORKA's knowledge of C. faujasi seems to come exclusively from GOLDFUSS's figure which as stated above gives an erroneous idea of the auricles and automatically also of the byssal sinus. As for the apical angle, I do not entirely understand why ZAZVORKA gives values for C. (C.) furcicostata reaching from 90° to 110° when for the holotype on pI. 2 the value does not reach 80° and this falls within the C. faujasi variability.» 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. 12, 13]
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Chlamys faujasi (M. Defrance, 1825): Dhondt, A. V., 1973, Systematic revision of the Chlamydinae of the European Cretaceous, Part 3: Chlamys and Mimachlamys, plate 1, figures 2a-2e.
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