This paper, devoted to centric diatoms, is a continuation in a series of publications on Bacillariophyta of small water bodies of Kiev. According to the published data, 19 species from 10 genera of centric diatoms are cited. The genera Aulacoseira (5 species), Cyclotella (4 species) and Stephanodiscus (3 species) are the richest in species; other genera are represented by one species each. The aim of the present investigation was to estimate the current diversity of centric diatoms in small water bodies of the city of Kiev using methods of electron and light microscopy. Algological materials were collected in water bodies of various types (small rivers, streams, springs, canals, ditches, ponds, lakes, floodwater bodies, and puddles) in different seasons. The methods of collection and processing of samples have been described in detail in an earlier paper of this series devoted to the order Naviculales. Samples were purified by cold combustion or boiling in concentrated sulfuric acid. Photomicrographs were taken with a scanning electron microscope JSM6060LA. As a result of the study, 27 species of centric diatoms represented by 31 infraspecific taxa, including the nomenclature type of the species, were found in small water bodies of Kiev. Among the genera, Stephanodiscus leads in species diversity (9 species, 33% of species composition). Genera Aulacoseira and Cyclotella are represented in the studied water bodies by three species each; other revealed genera were less diverse. Stephanodiscus binatus Håk. et H.J. Kling is first cited for the Ukraine. New records for water bodies of Kiev include 15 taxa; of these, two species (Melosira moniliformis, and Actinocyclus subtilis) are typically marine taxa. According to generalized literary and original data, 34 species (39 infraspecific taxa) of centric diatoms were found. in small reservoirs of the city of Kiev. They belong to 13 genera, 8 families, 7 orders and three subclasses (Coscinodiscophycidae, Coscinodiscophycidae and Thalassiosiraphycidae) of class Coscinodiscophyceae.

Keywords: centric diatoms, small water bodies, Kiev, flora, scanning electron microscopy

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