The current state of study of the gastropods of the Mandrikovka Beds (Upper Eocene of Ukraine), with the description of a new species of Conorbis

Gastropod assemblages from the Mandrikovka Beds of two main localities (village of Mandrikovka and Chapli granite quarry) are compared. The Chapli Assemblage is much more diverse in the number of species, which are mostly small-sized, collected by washing in sieves; the use of this technique is the main reason for the apparently higher diversity of this assemblage. However, some large-sized species occur in one locality and are absent from the other. In particular, the new species Conorbis veselovi sp. nov. is only recorded in the Chapli quarry; it is here described and evidence for its assignment to the genus Conorbis is presented.