Sarmatian molluscs from site Osek-1 in Slovenske gorice, Slovenia

This article is a contribution to the taxonomical investigation of Middle Miocene (Sarmatian) molluscs from section (fossil site) Osek-1 at Spodnji Osek (Slovenske gorice) in the Mura-Zala basin on western margin of Central Paratethys. One gastropod species Acteocina lajonkaireana and four bivalves Musculus sarmaticus, Sarmatimactra eichwaldi, Ervilia dissita and Venerupis dissita have been systematically described. The identifid fauna is assigned to the Lower Sarmatian age