The species of the genus Craticula are widely distributed in Europe, mostly occurring in brackish, saline to heavi-ly polluted waters. Some of the species are considered as being most tolerant to pollution. Recently, detailed observa-tions of this genus in Macedonia have been performed. During this study, 15 taxa have been recorded. One of the species (Craticula simplex) was observed with three different morphotypes, which can be distinguished by the valve size and shape. Craticula cuspidata

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... C. ambigua were the most frequently recorded species in various habitats, while species C. halophila, C. germainii and C. fumantii were observed only on a single locality. The highest diversity of Craticula was observed in temporary ponds on halomorphic soils and mineral springs in Eastern Macedonia.