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1

Karyotype and reproductive organs of male Dorypteryx domestica (Smithers, 1958) (Psocoptera: Trogiomorpha: Psyllipsocidae)

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Golub N. V., Kucerova Z.
Folia Biologica
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2008
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vol. 56
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issue 1-2
21-23
EN
The karyotype and male reproductive system, with special reference to the number of testicular follicles and shape of seminal vesicles, were studied in Dorypteryx domestica (Smithers, 1958) (Psocoptera: Trogiomorpha: Psyllipsocidae). This species displays 2n = 29 (28+X), a single nucleolus connected with one of the largest autosome pairs, and paired testes, each consisting of a single, large seminal follicle and a long, slightly coiled seminal vesicle.
2

The karyotypes of two bark-lice species (Psocoptera, Psocomorpha, Amphipsocidae): the first description of the neo-XY sex chromosome system in Psocoptera

100%
Golub N. V., Nokkala S.
Folia Biologica
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2001
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vol. 49
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issue 3-4
153-156
EN
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.
3

Automictic and apomictic parthenogenesis in psocids (Insecta: Psocoptera)

100%
Nokkala S., Golub N. V.
Folia Biologica
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2006
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vol. 54
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issue 1-2
19-22
EN
Karyotypes and meiosis patterns in three obligatory thelytokous Psocoptera species have been studied for the first time. Females of Aaroniella badonneli (Danks) display 9 chiasmatic bivalents in oocyte metaphase I (2n = 18), hence meiosis is of the automictic type. Females of Ectopsocus meridionalis Ribaga and Valenzuela sp. display 3n = 27, and 27 univalent chromosomes are present in oocyte metaphase I. Thus, meiosis in these species is of the apomictic type.
4

Holocentric chromosomes of Psocids (Insecta, Psocoptera) analysed by C-banding, silver impregnation and sequence specific fluorochromes CMA3 and DAPI

100%
Golub N. V., Nokkala S., Kuznetsova V. G.
Folia Biologica
|
2004
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vol. 52
|
issue 3-4
143-149
EN
The pattern of nucleolus attachment and C-heterochromatin distribution and molecular composition in the karyotypes of psocid species Psococerastis gibbosa (2n = 16+X), Blaste conspurcata (2n = 16+X) and Amphipsocus japonicus (2n = 14+neo-XY) were studied by C-banding, silver impregnation and sequence specific fluorochromes CMA3 and DAPI. Every species was found to have a single nucleolus in male meiosis. In P. gibbosa the nucleolus is attached to an autosomal bivalent; in B. conspurcata to the X-chromosome; in A. japonicus to the neo-XY bivalent. The species show a rather small amount of constitutive heterochromatin, C-blocks demonstrating telomeric localization with rare exceptions. P. gibbosa is characterized by a polymorphism for C-blocks occurrence and distribution. In the autosomes of this species, C-heterochromatin consists of AT-rich DNA except for the nucleolus organizing region, which is also GC-rich; the X-chromosome shows both AT- and GC-rich clusters. In A. japonicus and B. conspurcata, C-heterochromatin of the autosomes and sex chromosomes consists of both GC-rich and AT-rich DNA clusters, which are largely co-localized.
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