Abstract
The chromosome set of Chironomus crassimanus Strenzke, 1959 and pictures of its salivary gland chromosomes were presented by Keyl and Keyl (1959) and Keyl (1962). Keyl (1962) described the band sequence of chromosome AE compared with that of other Chironomus species. Later, Michailova (1989) described the chromosome markers of this species using material from Bulgaria. Martin (2006) indicated that the banding patterns of arms A and E of Chironomus acerbiphilus Tokunaga, 1939 are as in C. crassimanus and consequently suggested synonymy. Our study presents the karyotype of Chironomus acerbiphilus (= C. crassimanus) from Poland. This species is new for the Polish fauna.
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