Abstract
Male meiosis in three species of Nabis (N. brevis, N. flavomarginatus, N. limbatus) was studied. All species have the chromosome number 2n=18 (16A+XY). Nucleolar organizing regions were found to be located on the sex chromosomes. Male meiosis is characterized by the presence of a prominent diffuse stage. Autosomal bivalents during late meiotic prophase and metaphase I consist of two parallelly aligned chromosomes; no traces of chiasmata could be found. The cytology of Nabis is further characterized by the lack of telokinetic activity of chromosomes in male meiosis, the presence of interkinesis stage, the nonradiality of the first metaphase plate and the radiality of the second metaphase plate, and the distance pairing of the sex chromosomes instead of the usual touch-and-go pairing at second metaphase. The significance of cytological characteristics in constructing the phylogeny of the Heteroptera is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
