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1

Chromosome morphology and banding patterns in Hydra oligactis Pallas and H. circumcincta Schultze (Hydroidea, Hydrida)

100%
Anokhin B., Kuznetsova V.
Folia Biologica
|
1999
|
vol. 47
|
issue 3-4
91-96
EN
Karyotypes of Hydra oligactis Pallas, 1766 (2n = 30, FN = 60) and H. circumcincta Schultze, 1914 (2n = 30, FN = 56) were studied in mitosis and meiosis, using routine Giemsa-staining and C- and Ag-bandings. It was shown that in H. oligactis, C-blocks are situated in centromere regions of all chromosomes. In H. circumcincta, NORs were found to be present in one of the larger chromosome pairs. The species have no morphologically distinguished sex chromosomes. They differ from each other in chromosome morphology, showing 30 M/SM/ST in the former and 26M/SM + 4A in the latter.
2

Testis follicle number in psyllids (Psylloidea, Homoptera) as an anatomical feature in studies of systematic relations within the group.

81%
Glowacka E., Kuznetsova V., Maryanska-Nadachowska A.
Folia Biologica
|
1995
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vol. 43
|
issue 3-4
115-124
EN
The study presents all data recently available on the number of follicles and arragement of their spermatocyte cysts in 132 species of psyllids representing the world fauna.Anatomical differences in the male reproductive system of psyllids and their validation for phylogenetic relations are discussed in detail.
3

Standard and C-banded meiotic karyotypes of Psylloidea (Sternorrhyncha, Homoptera, Insecta)

81%
Maryanska-Nadachowska A., Kuznetsova V., Nokkala S.
Folia Biologica
|
2001
|
vol. 49
|
issue 1-2
53-62
EN
Meiotic karyotypes were studied in males of Craspedolepta sonchi (Foerster, 1848), Diaphorina chobauti Puton, 1898, D. lamproptera Burckhardt, 1981, Psylla hartigii Flor, 1861, Cacopsylla palmeni (Loew, 1878), C. hippophaes (Foerster, 1848), C. melanoneura (Foerster, 1868), C. pyricola (Foerster 1848), C. moscovita (Andrianova, 1848), Bactericera salicivora (Reuter, 1876), Trioza abdominalis Flor, 1861, T. lauri = Lauritrioza alacris (Flor, 1861). Karyotypes were 2n = 25 (24 + XO) in all species except B. salicivora with 2n = 26 (24 + neo-XY). Testes consisted of two follicles each in all species but P. hartigii with four-follicular testes in males. The discussion covers the problems of chromosome numbers, sex-determining chromosome systems, B-chromosomes, patterns of C- banding, testis structure, and spermatid development in Psylloidea.
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