Карагян Г.А., Калашян М.Ю.

Данные о кариотипах четырех видов жуков-усачей из Армении с обзором кариотипов в семействе (Coleoptera, Cerambycidae)

New data on meiotic male karyotypes of four species of longhorn beetles (Coleoptera, Cerambycidae) of Armenian fauna are given in the present report. For Anoplistes aghababiani Danilevsky with 2n♂=28 (26+Xyp), Oberea erythrocephala Schrank with 2n♂=20 (18+Xyp) and Agapanthia kirbyi (Gyllenhal) – 2n♂=20 (18+Xyp) AgNOR-banding and C-banding staining techniques were applied. The karyotype of Dorcadion seminudum Kraatz with 2n♂= 24 (22+Xyp) was studied after Giemsa staining.

Overall, karyological data within the family Cerambycidae are known for 201 species and subspecies belonging to 115 genera, 8 subfamilies (Smith, Virkki, 1978; Okutaner et al., 2011, 2012; Tokhatyan, Karagyan, 2013; etc.).

The lowest chromosome number, 2n=10, was indicated for Plocaederus obesus Gahan from the subfamily Cerambycinae (Nath et al., 1951). The highest numbers (2n=53-54) were discovered in Vesperus xatarti Mulsant (Vesperinae) (Dutrillaux et al., 2007). Besides, in the family a considerable variety of diploid chromosome numbers (2n) was recorded, as follows: 12, 14, 18, 19, 20, 22, 24, 26, 28, 30, 32, 34 and 36. The widespread number 2n=20 was found in 101 species, 58 genera, 6 subfamilies.

Male sex chromosome systems (such as: X0, Xy, XY, Xypand multiple sex chromosomes) were recorded for 161 cerambycid species. The Xyp “parachute” type is the most common (modal) and reported so far in 135 species, 84 genera, 6 subfamilies.

It is not possible at present to infer the ancestral karyotype constitution for the family Cerambycidae, nevertheless the chromosome formula 2n=20 (18+Xyp) reliably known in 75 cerambycid species from 4 subfamilies.