title: [Karyotype of chironomid Xenochironomus xenolabis (diptera, chironomidae)--obligatory miner of fresh water sponges].
abstract: The karyotype of chironomid Xenochironomus xenolabis has been first described. Chromosomes of X. xenolabis have a peculiar spatial organization: subcentromere areas of all chromosomes join together in one common chromocenter. Seven chromosome arms (A = B = C > D > E > F > G) are conventionally recognized in the karyotype. Each arm is subdivided into sections, beginning with the centromere area. The nucleoli are located in arm B and probably D. No chromosome reorganization was found in X. xenolabis. The strong conservatism and ordered organization of the chromosome set in X. xenolabis seem to be determined by a specific life style of its larvae and, consequently, by a relatively constant habitation conditions.
authors.affiliation: Saratov State Medical University.
authors.forename: S I
authors.initials: SI
authors.lastname: Belianina
authors.forename: N A
authors.initials: NA
authors.lastname: Durnova
mesh_terms: D000818:Animals; D002503:Centromere / Q000648:ultrastructure; D002683:Chironomidae / Q000235:genetics* / Q000648:ultrastructure; D002874:Chromosome Mapping; D002875:Chromosomes / Q000648:ultrastructure*; D007621:Karyotyping; D011161:Porifera; D012469:Salivary Glands / Q000648:ultrastructure; D013559:Symbiosis