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

Fedorowski J.

Acta Geologica Polonica

2009

Vol. 59, no. 3

283-317

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.

Early Bashkirian Rugosa (Anthozoa) from the Donets Basin, Ukraine. Part 1, Introductory considerations and the genus Rotiphyllum Hudson, 1942

Fedorowski J.

Acta Geologica Polonica

2009

Vol. 59, no. 1

1-37

The present paper is the first in a series devoted to the Early Bashkirian Rugosa (Anthozoa) from the Donets Basin. The history of investigation and current status of Early Bashkirian stratigraphy is discussed in the context of the Donets Basin strata. Corals of that time interval are extremely rare worldwide and those from the Donets Basin have never been described in detail. Four of the five species described are new: Rotiphyllum asymmetricum sp. nov., R. latithecatum sp. nov., R. simulatum sp. nov., and R. voznesenkae sp. nov. Two species are left in open nomenclature. The synonymy, species content and critical review of species potentially belonging to the genus Rotiphyllum are reviewed.