CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Meiotic Studies in Seven Heteropteran Species
Vikas SumanHarbhajan Kaur
Author information
JOURNAL OPEN ACCESS

2012 Volume 77 Issue 3 Pages 311-322

Details
Abstract

In the present study, 5 species of Lygaeidae and 1 each of Berytidae and Malcidae have been cytologically investigated for the first time; the diploid numbers in them vary from 12 to 20. Out of the 5 lygaeids, male diploid number is 12=8A+2m+XY in Dieuches leucoceras and Polycrates nexus while being 14=10A+2m+XY in Aphanus orientalis, Lanchnophorus sp. and Mizaldus sp. A pair of extremely large autosomes is found in both the species with 2n=12 while it may or may not present in species with 2n=14. One species each of Berytidae (Metacanthuspulchellus) and Malcidae (Malcus flavidipes) show 2n=20=18A+XY and 2n=16=12A+2m+XY respectively, and both lack an extremely large pair of autosomes. Microchromosomes are present in Lygaeidae (Rhyparochrominae) and Malcidae but absent in Berytidae. The sex determining mechanism in all the species of 3 families is XY/XX (♂/♀). Fragmentations seem to have played a pivotal role in the origin of new species irrespective of family.

Content from these authors
© 2012 The Japan Mendel Society
Previous article Next article
feedback
Top