The karyotypes of two bark-lice species (Psocoptera, Psocomorpha, Amphipsocidae): the first description of the neo-XY sex chromosome system in Psocoptera.
Karyotypes of two bark-lice species Amphipsocus japonicus End. and Dasypsocus japonicus End. (Amphipsocidae, Psocomorpha, Psocoptera) were studied for the first time. D. japonicus displayed 2n = 16 (14 + XX/X0). The XX/X0 sex chromosome system observed in this species is characteristic of the order Psocoptera. A. japonicus showed 2n = 16 (14 + neo-XY). This is the first observation of the neo-XY sex determination system in Psocoptera. In this species a large amount of constitutive heterochromatin was found in the original X-part of the neo-X chromosome.
Golub
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Department of Karyosystematics, Zoological Institute, Russian Academy of Sciences, 199034 St. Petersburg, Russia. res@zin.ru
Nokkala
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D000818:Animals; D005260:Female; D006570:Heterochromatin; D007313:Insecta / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D012730:Sex Chromosomes / Q000235:genetics*
D006570:Heterochromatin