KARYOTYPE AND MORPHOLOGY OF LARVAE OF CHIRONOMUS (CHIRONOMIDAE, DIPTERA) FROM
THE CASPIAN SEA
S. I. Belyanina,1 N. V. Polukonova,1 T. D. Zinchenko 2
1 Saratov Medical State University, Department of Biology, Saratov, and
2 Institute of the Volga Basin Ecology, RAS, Tol'yatti, Russia;
e-mail: 1 ecoton@rambler.ru è
2 ecology@attack.ru
Karyotype and morphology of Chironomus sp. larvae from the Caspian Sea have been described. 2n = 8.
Chromosomal arm combination is AB, CD, EF, G (cytocomplex thummi). All chromosomes display conjugation of homologues.
Centromere areas are of s-type. The nucleolar organizer and two Balbiani rings are disposed in arm C, and another Balbiani ring is
in arm B. Half larvae have heterozygotic paracentric inversions in arm D. The larva belongs to salinarius form. One scleritis is
colorless, an occipital scleritis is light and irregularly colored. Premandible has 4-5 cogs. Epipharingeal ridge has 18-23 dens.
This new species is close to salinarius group, especially to Ch. albidus Konst., but differs from it at the larva stage in the
structure of non-massive basal antenna segment, in the presence of large quantity of premandible denses, in light color of occipital
scleritis, and in a series of morphometric rates. A similarity berween Ch. paraalbidus and Ch. albidus, on the one hand,
and Boeotendipes, on the other one, has been found out.
Key words: midges, Chironomus paraalbidus, gr. albidus, karyotype, larva, salinarius form
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