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This study provides data on chromosome number (2n♂♀=26), sex determination mechanism (XY♂/XX♀), C-banding pattern, distribution of clusters of telomeric TTAGG repeats and 18S ribosomal DNA in the karyotype of the stonefly    Skwala   compacta    (McLachlan, 1872). For the first time in the history of stoneflies cytogenetics, we provide photos of the chromosomes of the   Plecoptera   insects. The karyotype of males and females of    S.   compacta    consists of 12 pairs of autosomes. Three pairs of large autosomes and four pairs of medium-sized autosomes are subacrocentric. The remaining pairs of autosomes are small, with unclear morphology. Pericentromeric C-bands were revealed in all autosomes. The sex chromosomes are also subacrocentric. The short arms of X and Y chromosomes are entirely heterochromatic and are rich in ribosomal DNA sequences. In the X chromosome this arm is larger than in the Y chromosome. It is likely that this arm associated with the nucleolar organizer ( NOR ). Telomeric DNA (TTAGG) n  repeats were detected in the terminal regions of all chromosomes.

comparative cytogenetics

﻿New insights into the chromosomes of stoneflies: I. Karyotype, C-banding and localization of ribosomal and telomeric DNA markers in    Skwala   compacta    (McLachlan, 1872) (  Polyneoptera  ,   Plecoptera  ,   Perlodidae  ) from Siberia

﻿New insights into the chromosomes of stoneflies: I. Karyotype, C-banding and localization of ribosomal and telomeric DNA markers in Skwala compacta (McLachlan, 1872) ( Polyneoptera , Plecoptera , Perlodidae ) from Siberia

New insights into the chromosomes of stoneflies: I. Karyotype, C-banding and localization of ribosomal and telomeric DNA markers in Skwala compacta (McLachlan, 1872) ( Polyneoptera , Plecoptera , Perlodidae ) from Siberia