FIRST FINDS OFLITHANCYLUS CASEY, 1969 (AMMONOIDEA, ANCYLOCERATIDAE) IN THE LOWER APTIAN OF UL'YANOVSK POVOLZHIE (VOLGA RéGION)

Abstract

The genus Lithancylus Casey, 1960 was previously unknown from Ul'yanovsk Povolzhye. L. grandis (J. de C. Sowerby, 1828) is recorded and four new species, L. glebi sp. nov., L. igori sp. nov., L. russiensis sp. nov., and L. tirolensiformis sp. nov., are described from the Lower Aptian of this region.