Summary
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1.
The diploid number of chromosomes in the maleLanchnophorus singalensis is twelve, eight out of which are the autosomes, twom-chromosomes and the remaining two the sex chromosomes.
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2.
The general course of meiosis is typically heteropteran for both the autosomes and the sex chromosomes, except for the absence of the contraction stage.
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3.
Them-chromosomes, unlike those of the other lygaeids and coreids, are split during diplotene and diakinesis, with the result that each one of them divides equationally during the first division, whereas during the second they undergo the ‘touch and go’ phenomenon and are thus segregated to the two spermatids.
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4.
The nature of this post-reductionalm-pair has been discussed.
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Parshad, R. Post-reductionalm-Chromosomes in the maleLanchnophorus Singalensis dohrn (Lygaeidae-Heteroptera). J Genet 55, 503–506 (1957). https://doi.org/10.1007/BF02984067
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DOI: https://doi.org/10.1007/BF02984067