Grozeva Snejana, Nokkala Seppo
Institute of Zoology, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel, 1000 Sofia, Bulgaria.
Folia Biol (Krakow). 2003;51(1-2):13-21.
The basic male karyotype of the six Nabis species (Heteroptera, Nabidae) is confirmed as being 2n=16+XY. The chromosomes are holokinetic while male meiosis is achiasmatic. The sex chromosomes undergo postreduction and in second metaphase show distance pairing, registered in all nabid species examined so far. Using C-banding technique for the first time in the family Nabidae, the heterochromatin was revealed on chromosomes of six species. The species showed different amount and distribution of C-heterochromatin. Only in Nabis (Dolichonabis) limbatus did the C-bands distribution make possible the identification of every chromosome pair in the karyotype. In other species, C-bands were found in some of the autosomes and the X, localized either interstitially or at telomeres. Only the Y usually showed relative stability ofthe C-banding pattern. In four of six species, extra (B) chromosomes were observed and their behaviour in meiosis described.
六种姬猎蝽（半翅目，姬猎蝽科）的基本雄性核型被确认为2n = 16 + XY。染色体为全动型，而雄性减数分裂为无交叉型。性染色体经历后减数分裂，在第二次中期显示远距离配对，这在迄今为止研究的所有姬猎蝽物种中都有记录。首次在姬猎蝽科中使用C带技术，在六种物种的染色体上发现了异染色质。这些物种显示出不同数量和分布的C异染色质。只有在缘姬猎蝽中，C带分布使得核型中每对染色体的识别成为可能。在其他物种中，在一些常染色体和X染色体上发现了C带，其位于间质或端粒处。只有Y染色体通常显示出C带模式的相对稳定性。在六个物种中的四个物种中观察到了额外的（B）染色体，并描述了它们在减数分裂中的行为。
