Cytogenetic characterization of Mylabris pustulata (Coleoptera: Meloidae)
Paramjeet Kaur, Abhay Singh Yadav
The chromosomes obtained from meloid beetle Mylabris pustulata Thumb. of subfamily Meloinae was studied using standard staining and C-banding. The cytological information of beetles is useful in many ways. Theoretically, it is important to understand the mechanism governing the transmission of genetic information, hence speciation and for classification on taxonomic levels. It is also useful in the field of applied economic entomology for the improvement of species. The karyotype of Mylabris pustulata, is comprised of 22 chromosomes with meioformula, 10AA+Xyp. The analysis of constitutive heterochromatin (CH) revealed small blocks located in the terminal regions of dumbbell shaped bivalents in metaphase I. The increased in chromosome number from 20 (Modal number) to 22 and with conserved sex chromosome mechanism in Mylabris pustulata as compared to other species of this family is suggestive of the Robertsonian fission of autosomes having played some role in the evolution of karyotype in this family.