Hemidiaptomus is a genus of freshwater copepods in the family Diaptomidae, containing the following species: Hemidiaptomus ignatovi G. O. Sars, 1903 Hemidiaptomus monticola Weisig & Ali-Zade, 1938 Hemidiaptomus rylovi Charin, 1928 Hemidiaptomus tarnogradskii Rylov, 1926
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