KARYOLOGY OF MALE AND FEMALE PSEUDOAGRION RUBRICEPS (ZYGOPTERA : COENAGRIONIDAE)

Chromosomal analysis has been carried out on male and female individuals of Pseudoagrion rubriceps collected from the states of Jammu and Kashmir, Punjab, Assam and Meghalaya in India. Majority of mitotic and meiotic stages possess the diploid numbers 27 males and 28 in females with XO - XX Sex determining mechanism. The autosomes include a tiny pair of m chromosome in both sexes. Numerous plates showing autosomal fragmentations in different meiotic stages of the same individual have been observed. In these, diploid numbers vary from 27 to more than 45. Female karyotype and autosomal fragmentations have been reported for the first time in this damselfly.