Early Bashkirian Rugosa (Anthozoa) from the Donets Basin, Ukraine. Part 2. On the genera Axisvacuus gen. nov. and Falsiamplexus Fedorowski, 1987

Five species belonging to two genera: Falsiamplexus Fedorowski, 1987 and Axisvacuus gen. nov. are described in detail and their species content and relationships are discussed. Both genera are perhaps related to Rotiphyllum and were probably derived from it, but relationship of Falsiamplexus to Bradyphyllum Grabau, 1928 cannot be excluded. The new genus Axisvacuus is represented by four species, of which three are new: A. verus (type species), A. extendus and A. semicirculatus. Stratigraphic ranges of species described are compared to the western European and Russian standards (Table 1). Some possible palaeogeographic implications of the occurrence of Axisvacuus postumus (Smith, 1931) and Falsiamplexus reductus Fedorowski, 1987 are briefly discussed.