Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 24-25. 2007. (Budapest, 2007)

FRAGMENTA PALAEONTOLOGICA HUNGARICA 24-25, BUDAPEST, 2007 Initial notes to a revision of Late Triassic gastropods from Budapest (Hungary): Hungariella KUTASSY, 1933 (Neritopsidae) by János SZABÓ Abstract — During the early years of the twentieth century, the Transdanubian Central Range in Hungary became a classical area for the exploration of the Triassic faunas. Several papers on gastropods were also published. As initial part of a series, planned on results about a revision of the gastropod faunas, this paper updates knowledge on Hungariella KUTASSY, 1933 (Neritopsidae) with some corrections. New name is given instead of "Neritopsis/Hungariella spinosa KUTASSY, 1927" that is a primary junior homonym of a iShddle Jurassic gastropod. Lectotypes and a neotype have been selected to the species, respectively. Keywords — Hungariella, Neritopsidae, Gastropoda, Late Triassic. SZABÓ, J.: Initial notes to a revision of Late Triassic gastropods from Budapest (Hungary): Hungariella KUTASSY, 1933 (Neritopsidae). — Fragmenta Palaeontologica Hungarica, 24-25: 69-75. Introduction Rather few localities are known with well preserved megafossils from the Late Triassic. Their significance has been recently raising with the increasing interest of the earth science researchers in the end-Triassic mass extinction. The youngest fossiliferous sediments, deposited before the extinction, have become important sources in collecting information about the last, undamaged state of the biota, therefore the value of the previously published faunas is also increasing. In Hungary, there are several prospective localities and faunas corresponding to the above criteria, however, from the point of view of gastropods, the importance of the northwestern edge of Budapest and the adjacent western area has already been demonstrated. Gastropods were collected from two localities (Figure 1) of Late Triassic Dachstein Limestone, exposed in quarries of Remete-hegy (Norian) and Fazekas-hegy (Carnian), respectively. Larger part of Remete-hegy with fossiliferous outcrops extends westwards beyond the boundary- of Budapest to the area of Remeteszőlős, a neighbouring village. Megataunas of these localities, nearby each-other, were published by KUTASSY (1927, 1933, 1936)', BARTKO (1939) and BÉRCZINF MAKK (1969). These papers added lots of new information to the knowledge of the Late Triassic "Alpine" type (= Tethyan) faunas. These faunas are principal sources also to find the roots of the post-Triassic (Early Jurassic) recovery, that is a not less interesting and important field of research. The author is especially interested in the latter aspect of studies within Class Gastropoda; that is why he has started working on Triassic gastropods. One part of his project aims to revise the originals that have become basic documents for the Triassic palaeontology with their publication from Hungary before 1940. Some ten years after their publications, usually even a simple systematic revision itself can result in new data, however, experience shows that the original collections usually contain lots of information that have still remained hidden. The typical Dachstein Limestone developed in shallow water of high energy platform environment that was disadvantageous for fossilisation. Normally megafossils are rare and hardly removable from the massive matrix. In the area of Remete-hegy and Fazekas-hegy, a local Dachstein Limestone variety lost the usual hardness and the fossils became relative easily cleanable from the chalky matrix. Another speciality of this facies is the rich, shelly, relatively wellFigure 1 — Sketch map of the localities. — Asterisks indicate the abandoned quarries; dotted Une is the boundary of Budapest in the NW part of the cin. Distance of localities is about one kilometre.