Abstracts
Karyological investigations have been carried out on 23 species of seven genera belonging to family Coenagrionidae. These have been collected from states of North-west and North-East India during pre-monsoon and post-monsoon Seasons. Among these, 21 are male species and 4 are female species. In males, 16 species reveal 2n=27 as diploid chromosome number and 2n=25 in remaining five species. In females, all the species possess 2n=28 as diploid chromosome number. All the species have XO-XX type sex determining mechanism. Autosomal fragmentation has been observed in Agriocnemis obscura (9), Ceriagrion coromandelianum (d), Coenagrion dyeri (9), Pseudoagrion decorum (d) and Pseudoagrion rubriceps (d&9). Chromosome number varies from 27-60 in gonial metaphase plates. Sex element could not be differentiated in the fragmented stages. Behaviour and morphology of chromosomes during meiosis have been studied and compared within family and within genera.
Keywords :Chromosome number, Autosomal fragmentation, Bardiagrams.
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Karyological investigations have been carried out on 23 species of seven genera belonging to family Coenagrionidae. These have been collected from states of North-west and North-East India during pre-monsoon and post-monsoon Seasons. Among these, 21 are male species and 4 are female species. In males, 16 species reveal 2n=27 as diploid chromosome number and 2n=25 in remaining five species. In females, all the species possess 2n=28 as diploid chromosome number. All the species have XO-XX type sex determining mechanism. Autosomal fragmentation has been observed in Agriocnemis obscura (9), Ceriagrion coromandelianum (d), Coenagrion dyeri (9), Pseudoagrion decorum (d) and Pseudoagrion rubriceps (d&9). Chromosome number varies from 27-60 in gonial metaphase plates. Sex element could not be differentiated in the fragmented stages. Behaviour and morphology of chromosomes during meiosis have been studied and compared within family and within genera.
Keywords :Chromosome number, Autosomal fragmentation, Bardiagrams.
Please see full information
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