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AbstractWe studied the karyotype and chromosomal distribution of 18S rDNA clustered in nucleolar organizer regions ( NORs ) in    Nysius   graminicola    (Kolenati, 1845), belonging to the subfamily   Orsillinae   (  Lygaeidae  ). It is shown that this species has a karyotype with 2n = 22(18+mm+XY), previously known in only one of 24 studied species of the genus    Nysius    Dallas, 1852, characterized by a similar karyotype, 2n = 14(12+mm+XY). In    N.   graminicola   , 18S loci are located on sex chromosomes, which is a previously unknown trait for this genus. Our results in a compilation with previous data revealed dynamic evolution of rDNA distribution in    Nysius   . It is concluded that molecular chromosomal markers detected by  FISH  contribute to a better understanding of the structure and evolution of the taxonomically complex genus    Nysius   .

﻿Karyotype diversity in the genus Nysius Dallas, 1852 ( Hemiptera , Heteroptera , Lygaeidae ) is much greater than you might think

Karyotype diversity in the genus Nysius Dallas, 1852 ( Hemiptera , Heteroptera , Lygaeidae ) is much greater than you might think