THE KARYOTYPE OF OMISUS CALEDONICUS (EDWARDS) (DIPTERA, CHIRONOMIDAE)
N. A. Shobanov
Institute for Biology of Inland Waters RAS, Borok, Yaroslavl district, Russia;
e-mail: shobanov@ibiw.yaroslavl.ru
Karyotype of Omisus caledonicus with 2n = 14 is described, all chromosomes are acrocentric, heterochromatin
centromere is vacuolized. The following sequence discovered: A1, A2, B1, B2, C1, C2, D1, D2, E1, F1, G1 and G2. Simple inversions
are found in chromosomes A-C and G, a complex reconstruction with 3 break points are observed in chromosome D. All reconstructions
are large (from 66 to 99 % of bands). According to phylogenetic reconstructions for morphological characters (Saether, 1979) and
data on karyotypes it may be considered that O. caledonicus is one of much more primitive species in the tribe Chironomini.
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