Dr. Fűköh Levente szerk.: Malakológiai Tájékoztató 12. (Eger, 1993.)

FŰKÖH, L.: Main features of the development of the Hungarian Holocene Mollusc fauna

Main features of the development of the Hungarian Holocene Mollusc fauna L. Fuköh Abstract: Development of the Hungarian Holocene Mollusc fauna is summarized briefly. Those species are stressed only which occurence is characteristic for each stratigraphical units. The former studies (Fűköh, L. 1986a, b, 1987, 1988, 1990, 1991, 1992a, b, c) sum up the main characteristic features, chronostratigraphical and biostratigraphical rangeing of the mollusc fauna of the mountain-ranges of medium height and subsided zones. These studies are based on the dominance relations of the species within the fauna primarily. There were lack of such a comprichensive estimation of the Hungarian Holocene mollusc fauna wich shows the development of certain elements of the fauna on the level of species. It is why we have taken into consideration works on the fauna of the surrounding countries, though the differet geographical conditions may strongly affect the applicability of these data in Hungary. The aim of the following table and brief evaluation is to try to retrieve the above mentioned insufficiency. Though these data are for not complete they could mean great help for the coming examinations. Development of the Holocene Mollusc fauna of the mountain-ranges of medium height (Bakony Mountains, Bükk Mountains, Aggtelek-karst region) There are 81 mollusc species are known from the studied cave deposits and streamside sediments hitherto. Among the species the author haven't taken account for those freshwater ones, which occurrence is rare in the sediment (Lymnaea peregra, Lymnaea truncatula, Anisus spirorbis). The only freshwater species wich can be found in the list containing 81 species is the Sadleriana pannonica. Half of the species were the member of the fauna during the whole Holocene. There are only 39 species which haven't been found none of the chronostratigraphical and biostratigraphical units, yet. The number of the above mentioned species surely will decrease because of the further detailed elaboration of the fauna. On the other hand there will be species wich lack will be significant during the examinations, so these could play important role in the determination of the age of the faunae: Sadleriana pannonica Pyramidula rupestris Vertigo antivertigo Vertigo pygmaea Pupilla triplicata Ena montana Macrogastra latestriata Clausilia cruciata in spite of its high number of individuals it hasn't been found in boreal sediments known only from boreal and subboreal sediments known only from the latest subatlantic deposits known exclusively from the sediments of the atlantic and subatlantic phases known only from the earliest sediment of the Holocene (boreal and atlantic phases) it can be found in boreal sediments only known only from atlantic and subatlantic sediments known only from the earliest sediments of the Holocene (boreal and atlantic phases)