Karyotypes (the number, shape, C-bands, NORs, chiasma frequency) of four species of Landrevinae were studied. Three species are characterized by a karyotype of 2n male=19 - Duolandrevus (Eulandrevus) sonorus, D. (E.) dendrophilus and D. (E.) enatus while Vasilia vietnamensis showed 2n=17. Differences of karyotypes are connected with simple Robertsonian translocation in autosomes. Successive stages of spermatogenesis were analysed.
Karyotypes, C-bands distribution of nine species belonging to 6 genera, and chromosomal location of NORs in some species were studied. Differences in the chromosome numbers, their morphology, and the position of C-bands between species of Poecilimon and IIsophya are discussed.
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