Structure of the Heteropteran Kinetochore The behaviour of the long chromosomes in some lygaeid and coreid bugs during mitosis and meiosis

Abstract

1. The long chromosomes both in Cletus punctiger and Lanchnophorus singalensis possess active mobility at two points, terminal in the former and sub-terminal in the latter, during the gonial anaphase, while in both the meiotic divisions it is confined to one end only. This actively mobile end, in the meiotic anaphases, further differs from the remaining part of the chromosome by a different nature of the heterochromatin.
2. The structure of these long elements in all the four species, Cletus punctiger, Lanchnophorus singalensis, Aphanus sordidus and Dieuches sp., during the mitotic and meiotic prophases reveals that these elements have no region with a special cycle of division.
3. In spite of a close similarity of the chromosome form in Homoptera and Heteroptera it has been seen that the chromosomes in the latter differ markedly from those of coccids and aphids (Homoptera) where the diffused nature of the kinetochore has been established experimentally.
4. It has been suggested that the kinetic activity in Heteroptera resembles that of the T-chromosome of rye rather than a diffused one.