C-Banding and Ag-NOR Staining on Neurobasis chinensis chinensis (Linnaeus) of Family Calopterygidae from Himachal Pradesh, India (Odonata: Zygoptera)

摘要

Neurobasis chinensis chinensis of the family Calopterygidae is the only species of this genus present in India. This species was collected from Andretta and Mcleodganj areas of Himachal Pradesh, India. The species possesses 2n=23 which is less than the type number (2n=25) of the family. The chromosome complement shows the presence of large pair of autosomes originated by the fusion of two autosome pairs and is responsible for the reduction in the chromosome number. This fusion has been confirmed by C-banding with the presence of two interstitial and terminal C-bands on the largest autosomal bivalent having two chiasmata while remaining autosomal bivalents possess terminal C-bands and single chiasma which is the characteristic feature of Odonata. Ag-NOR staining shows the presence of terminal NOR bands in seven autosomal bivalents and the X chromosome is rich in NORs. C-banding and Ag-NOR staining have been performed for the first time on this species.