title: [Cytogenetic features of the blood-sucking blackfly Wilhelmia paraequina Puri (Diptera: Simuliidae) from Armenia].
abstract: Three blackfly Wilhelmia paraequina populations of Armenia (rivers Debet and Megriget, channel Megri) were studied. 2n = 6: IS + IIL, IIS + IL, IIIS + IIIL. Cytological maps of polytene chromosomes were constructed. High inversion polymorphism (95.63%) was observed, with 2.6 inversions per individual. Three inversions proved to be associated with male development: Y1 was characterized by a combination of two heterozygous inversions, IIL-3 + IIL-1, while Y2 had another combination of heterozygous inversions, IIL-5 + IIL-3. The X chromosome had a standard homozygous IIL disk sequence. The populations were shown to be similar in autosomal polymorphism. A tendency for differentiation was observed with respect to frequencies and types of sex-linked inversions: the sex determination system was Y1X-XX in the Debet and Megriget populations and Y2X-XX in the channel (Megri) population. On the strength of these findings, one W. paraequina morphotype was assumed to involve two cytotypes, A (Debet and Megriget populations) and B (Megri population).
authors.affiliation: Zoological Institute, Russian Academy of Sciences, St. Petersburg, 199034 Russia.
authors.forename: N A
authors.initials: NA
authors.lastname: Petrova
authors.forename: L A
authors.initials: LA
authors.lastname: Chubareva
authors.forename: P N
authors.initials: PN
authors.lastname: Adler
authors.forename: E A
authors.initials: EA
authors.lastname: Kachvorian
mesh_terms: D000818:Animals; D001136:Armenia; D002503:Centromere; D002871:Chromosome Banding; D007446:Chromosome Inversion; D002874:Chromosome Mapping / Q000662:veterinary; D004171:Diploidy; D005618:Fresh Water; D005828:Genetics, Population; D006570:Heterochromatin; D006579:Heterozygote; D008297:Male; D011110:Polymorphism, Genetic; D012843:Simuliidae / Q000145:classification / Q000166:cytology / Q000235:genetics*
chemical_list: D006570:Heterochromatin