Parvamussium bronni (Mayer-Eymar, 1861)
MAYER-EYMAR, K. 1861. Description de Coquilles fossiles des terrains tertiaires inférieurs. Journal de Conchyliologie [3e Série], 9 (1): 52-68, pl. 3 (under C. Mayer). [p. 58]
1861 Pecten bronni Mayer-Eymar, 1861
«P. testa parva, rotundata, depressa, tenui, cornea, aequilalerali, aequivalvi, extus rugis concentricis regularibus, tenuibus, numerosis, intus radiis duodecim ornata; auriculis subaequalibus, minutis.
Long. et lat. 12 mill.
Coquille de petite taille, arrondie, déprimée, mince et cornée, équivalve et à peu près équilatérale ; surface extérieure occupée par un grand nombre de rides ou sillons concentriques réguliers et étroits; intérieur orné de douze carènes ou côtes étroites, également distantes et allant du crochet au bord opposé; oreillettes petites, à peu près égales.
Voisine du P. squamula, Lam., et surtout du P. duodecim-Iamellatus, Bronn , celte espèce s'en distingue, avant tout, par les rides concentriques qui couvrent la surface extérieure des valves. Elle est commune à Hoering, près Schwatz, dans le Tyrol, dans l'étage tongrien.» KARL MAYER-EYMAR, 1861
|
«In the Paratethys Oligocene the genus Parvamussium is represented by the species P. bronni reported from Austria, the Czech Republic, Hungary and Ukraine. The species P. bronni is distinguished from all other species of Paratethyan Parvamussium by the absence of any radial sculpture and by the presence of coarse commarginal lamellae on both left and right valves (see Löffler, 1999, p. 121–123, pl. 27, figs. 1–5). The main difference between P. bronni and P. duodecimlamellatum, as pointed out by Mayer (1861 fide Löffler, 1999), is the presence of commarginal lamellae on the left valve and more distinct, always straight internal riblets in the latter species. The earliest record of P. bronni is that from the Zementmergel Formation at Bad Häring in Tyrol, Austria. Based on its cal car e ous nannofloral content, indicative of the NP22 Zone, the Zementmergel Formation is assigned to the lower Kiscellian (Lower Oligocene; Löffler, 1999). The geographically closest occurrence of P. bronni was noted by Oppenheim (1922, p. 20, pl. 3, figs. 14, 20) from Pouzdřany in the Lower Oligocene of Moravia, Czech Republic.
The occur rence of P. bronni is well-documented in various localities of the Kiscell Clay Formation in Hungary. By means of an integrated study of planktic foraminifera and calcareous nannofossils (lower part of the NP24 Zone), a late Kiscellian (Late Oligocene) age is indicated for the Kiscell Clay Forma tion (Báldi, 1986). This essentially Paratethyan species was also found in the Skyba Unit of the Ukrainian Carpathians. A few poorly preserved specimens of P. bronni were derived from the Middle Menilite Subformation ex posed along the Chechva River (Popov et al., 2009). Dark micaceous argillite shales cropping out at Spas yielded a cal careous nannoplankton as semblage that indicates the Oligocene/Miocene boundary (the boundary between the NP25/NN1 zones).» STUDENCKA, B., V. A. PRYSYAZHNYUK & S.A. LJUL’EVA. 2012. First record of the bivalve species Parvamussium fenestratum (Forbes, 1844) from the Middel Miocene of the Paratethys. Geological Quarterly, 56 (3): 513-528, figs. 1-5. [p. 522]
|
Pecten (Parvanusium) [sic] Bronni M.-E.; P. Oppenheim, 1922, Über Alter und Fauna des Tertiärhorizontes der Niemtschitzer Schichten in Mähren, plate 3, figures 14, 20.
|