The study of calcareous nannoplankton in Cretaceous deposits of the south of Ukraine was carried out. Prior to the present study 103 species of nannofossils was known in the Cretaceous samples of Ukraine. A study of the original samples, and the revision of the original and literature data on Cretaceous calcareous nannoplankton of Ukraine, according to Bown and Joung (1997), found 160 species and subspecies belonging to 73 genera, 21 families, and 5 orders. The order Eiffelithales Rood, Hay et Barnard is represented by 3 families, 17 genera, and 35 species including 5 genera and 5 species first cited for Ukraine. For the order Stephanolithales Bown et Young. 7 species from 4 genera of 1 family are known in Ukraine. The order Podorhabdales Rood Hay et Barnard is represented by 5 families, 23 genera, and 37 species; 8 genera and 14 species of this order are new records for Ukraine. The order Watznaueriales Bown contains 1 family, 4 genera, and 10 species. The order Arkhangelskiales Bown et Hampton is represented by 2 families, 4 genera, and 7 species; among them, 5 genera and 5 species were found in Ukraine for the first time. The group Nanolith includes representatives of 5 families, 15 genera, and 34 species; 2 genera and 9 species are first cited for Ukraine. The group Incertae sedis comprises 4 families, 6 genera, and 30 species. The taxonomic list of Cretaceous calcareous nannofossils with descriptions of revealed genera, families, and orders is given.

Keywords: Calcareous nannoplankton, Cretaceous, south Ukraine, revision

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