Abstract
The diploid chromosome number in spermatogonial metaphase, the meiotic cycle, the haploid number with the chromosome formula and sex chromosome mechanism at primary spermatocyte division have been studied for the first time in five species of tenebrionid beetles,Platynotus exavatus F.,Gonocephalum depressum Fabr.,Pachycera arta Hbst.,Himatismus fasciculatus Fabr., andHiperops coromendelensis Sol. The first, second and the last three species belong to the subfamilies Pedininae, Opatrinae and Epitraginae respectively. The Karyotypes are uniformly viewed as 2n=20 orn (1st div.)=10 with sex mechanism Xy p having the chromosome formula 9AA+Xy p . Against the background of the previous study the modal chromosome number and the sex mechanism are discussed.
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