Praechlamys rollei (Stoliczka, 1861)
STOLICZKA, F. 1861. Über die Gastropoden und Acephalen der Hierlatz-Schichten. Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften [Mathematisch-Naturwissenschaftliche Classe. Abt. 1, Mineralogie, Botanik, Zoologie, Anatomie, Geologie und Paläontologie], 43: 157-204, pls. 1-7. [p. 197, pl.6, figs. 5, 6a, 6b]
1861 Pecten rollei Stoliczka, 1861
F. Stoliczka, 1861, plate 6.
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«Die Schale ist abgerundet, etwas höher als lang. Beide Klappen sind fast gleichmässig gewölbt, mit starken concentrischen Wülsten, welche gegen die Peripherie breiter und niedriger werden. Vom Wirbel gehen radienartig Rippen aus, die von concentrischen, etwas schwächeren Streifen durchsetzt werden; zwischen denen sieh dicht an einander feine und schief stehende Leistchen (Fig. 6 b) befinden, so dass die Schale eine vierfache Ornamentirung zeigt. Die Ohren sind ungleich gross und durch doppelte Streifung gegittert. Das vordere grössere Ohr ist an der linken Klappe sanft ausgebuchtet, an der rechten besitzt es einen tiefen Ausschnitt für den Austritt des Byssus.
Sehr selten am Hierlatz, sehr häufig am Schafberge. Diese Art hat die grösste Ähnlichkeit mit Pecten cutiformis Hörnes (Denkschr. IX. Bd., p. 53, t. 2, f. 20) aus den Hallstätter Schichten; dieser ist jedoch etwas schmäler, flacher und die Ohren sind im Verhältnisse zur Grösse der Schale viel kleiner. Ferner sind die radialen und die concentrischen Streifen gleich stark.» FERDINAND STOLICZKA, 1861
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«Praechlamys rollei (STOLICZKA, 1861) (plate IV: 4-7) — The fauna of the red fissure-filling limestone is predominated by the peculiar species Praechlamys rollei reported as a frequent form at the Schafberg by STOLICZKA (1861). It seems to be much probable that the syntypes, whose whereabouts is unknown, were also collected from Pliensbachian that can be thus considered as the stratum typicum of P. rollei. Some poorly preserved valves bearing comarginal rugae and doubtfully assigned to P. rollei have been found in the Hierlatz Limestone as well.»
VÖRÖS, A., J. SZABÓ, A. DULAI, I. SZENTE, O. EBLI & H. LOBITZER. 2003. Early Jurassic fauna and facies of the Schafberg area (Salzkammergut, Austria). Fragmenta Palaeontologica Hungarica, 21: 51-82, pls. 1-8. [p. 59]
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Praechlamys rollei (Stoliczka, 1861); Vörös et al., 2003, Early Jurassic fauna and facies of the Schafberg area (Salzkammergut, Austria), plate 4, figures 4-7.
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«One specimen of P. rollei from the former manganese-ore mine at Eplény (Pl. I: 6) has been preserved with traces of the outermost shell layer, which shows very fine antimarginal striation (Pl. I: 7), an unusual feature in Praechlamys (WALLER & MARlNCOVICH 1991). The fine "radial" striae observed by CONTI & MONARI (1991) on valves of P. rollei from the Lower Jurassic of Turkey are most probably also antimarginal ones.»
SZENTE, I. 1996. Bivalve ecology in the Pliensbachian (Lower Jurassic) of the Bakony Mts. (Hungary). Description of a new species of Eopecten. Fragmenta Mineralogica et Palaeontologica, 18: 19-29, figs. 1-3, pl. 1. [p. 25]
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Praechlamys rollei (Stoliczka, 1861); I Szente, 1996, Bivalve ecology in the Pliensbachian (Lower Jurassic) of the Bakony Mts. (Hungary). Description of a new species of Eopecten, plate 1, figures 6-8.
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«No syntypes of Praechlamys rollei (STOLICZKA 1861, p. 197, pl. 6, figs 5-6.) are housed in the STOLICZKA Collection, but several specimens are available both from the Northern Calcareous Alps and the Bakony Mts. P. rollei is characterized by valves bearing radial plicae and strong comarginal rugae. The number and width of plicae are variable (pl. 1, figs 14-17). This species is widespread in the peri-Mediterranean Pliensbachian, especially in the "ammonitico rosso" facies (see e. g. KULLMANOVÁ & KOCHANOVÁ (1976, pl. 24, figs 7-9; CONTI & MONARI (1991, p. 255, pl. 3, fig. 18).»
SZENTE, I. 1996. Bivalve assemblages from the Austrian and Hungarian Hierlatzkalk (Lower Jurassic): a comparison. In H. Lobitzer & D. Endre (Eds.), 1996, Advances in Austrian - Hungarian Joint Geological Research, 137-145, pl. 1. Budapest. [p. 140]
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Praechlamys rollei (Stoliczka 1861); I. Szente, 1996, Bivalve assemblages from the Austrian and Hungarian Hierlatzkalk (Lower Jurassic): a comparison, plate 1, figures 14-17.
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«Description: Left valve orbicular, equilateral, orthocline, moderately convex, slightly irregular in profile, as long as high. Posterior auricle small; its posterior edge forms an obtuse angle with the straight dorsal margin. Anterior auricle not preserved. Anterodorsal and posterodorsal margins of disc straight and subeq ual. Apical angle of about 105°. Ventral margin rounded. Ornamentation consists of 20-30 radial riblets of first order, quite regularly spaced; riblets of second and third order appear during growth in the intervals. On the median part of the ventral margin secondary riblets can reach up to six. Fine, regularly and closely spaced concentric threads cover the whole surface and overlap the radial sculpture. They are moderately more frequent on the ventral area. The radial sculpture crossing the concentric one creates an elegant network. About ten concentric folds, subequal and regularly spaced on the dorsa l half of the disc; a larger irregularity in the ventral half makes the valve profile slightly irregular.
Remarks: Johnson (1984) regarded Chlamys (Chlamys) rollei (Stoliczka, 1861) as synonym of Chlamys (Chlamys) textoria (Schlotheim, 1820), this last resulting in a very comprehensive and variable species ranging from Hettangian to Tithonian. In our opinion, such an arrangement could be shared after detailed comparative analyses between stratigraphic and geographic distributions of the species recognized by Johnson as synonyms. On the other hand, C. (C.) rollei seems to be a somewhat definite species, especially by the presence of regular concentric folds in addition to the reticulate ornament. Moreover, our specimens and those ascribed by the authors (see the synonymy) to C. rollei, show quite even morphological characters. In particular, they fit well with the type of Chlamys (C.) rollei, coming from Liassic deposits of Hierlatz. The species was also identified from Middle Liassic sediments of the Rhone basin, Dorset, Italy and Transcaucasia.»
CONTI, M. A. & S. MONARI, 1991. Bivalve and gastropod fauna from the Liassic Ammonitico Rosso facies in the Bilecik area (Western Pontides, Turkey). Geologica Romana, 27: 245-301, pls. 1-9, figs. 1-20. [p. 256]
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Chlamys (Chlamys) rollei (Stoliczka); M. Conti & S. Monari, 1991, Bivalve and gastropod fauna from the Liassic Ammonitico Rosso facies in the Bilecik area (Western Pontides, Turkey), plate 3, figure 18.
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