Praechlamys palosa (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, fig. 8]
1861 Pecten palosus Stoliczka, 1861
1874 Pecten stoliczkai Gemmellaro, 1874
1874 Pecten stoliczkai Gemmellaro, 1874
F. Stoliczka, 1961, plate 6.
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«Die Schale ist spatenförmig, fast gleichseitig, etwa ein Fünftel höher als lang, schwach gewölbt, mit spitz auslaufenden Wirbeln, von welchen gegen 20 feine Rippen ausstrahlen. Ausserdem sind nur feine Zuwachsstreifen bemerkbar. Das vordere Ohr ist etwas grösser, mit einer seichten Ausbuchtung das hintere kleiner und schliesst sich erst an eine wulstförmige Aufbiegung der Schale an. Beide Ohren sind glatt.
Sehr selten am Hierlatz und auf der Gratzalpe.» FERDINAND STOLICZKA, 1861
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«Praechlamys palosus (STOLICZKA, 1861) (plate IV: 2-3) -- P. palosus is characterised by a markedly low umbonal angle « 90°) as well as by the different ornamentation of the left and right valves (see SZENTE 1996a, 1998). In the Lower Jurassic of the Northern Calcareous Alps this species seems to be confmed to the Sinemurian Hierlatz Limestone»
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 palosus
(Stoliczka); Vörös et al., 2003, Early Jurassic fauna and facies of the Schafberg area (Salzkammergut, Austria), plate 4, figures 2, 3. |
«Praechlamys palosus (STOLICZKA 1861) was based on an incomplete, single left valve (GBA 2958) (pl. 1, fig. 12), figured by STOLICZKA (1861, pl. 6. fig. 8). The shape of the auricles as well as the ornamentation differ from the features displayed by the figure, which latter shows a more dense ornamentation instead of the about 20 plicae mentioned in the description and observable on the holotype and on other specimens (pl. 1, figs 10, 13). Right valves of P. palosus are smooth or are ornamented with very fine plicae (pl. 1, fig. 11).
P. stoliczkai (GEMMELLARO 1874) (Gemmellaro 1874, pl. 12, figs 1-2; Monari 1994, p. 169, pl. 2, fig. 13; pl. 3, figs 1, 2) can be considered as a junior synonim of P. palosus. Praechlamys was introduced by ALLASINAZ (1972) as a subgenus of Chlamys RÖDING 1798, for a group of Triassic pectinids ornamented with radial plicae whose number increases with intercalation, and usually bearing an exterior radial depression on the posterior part of the left valve. Later WALLER & MARINCOVICH (1992) elevated Preachlamys onto generic rank and listed some species, among them P. palosus, as evidences of the presence of the genus in the Jurassic. The marked difference between the ornamentation of left and right valves of P. palosus seems to be, however, a rather unusual feature in Praechlamys. Consequently, the generic assignment of the species is somewhat doubtful.» 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 palosus (Stoliczka 1861); I. Szente, 1996, Bivalve assemblages from the Austrian and Hungarian Hierlatzkalk (Lower Jurassic): a comparison, plate 1, figures 10-13.
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