Abstract
Present paper deals with the detailed morphological, cytological and cytotaxonomical studies on 3 cytotypes of N hyalina f. hyalina, collected from Mudasarilova tank (Visakhapatnam), Sakhya Sagar dam (Shivpuri) and Tighra dam (Gwalior). The cytological preparations reveal the occurrence of chromosomes counts of n=15, 18 and 21, respectively. Count of 3 chromosomes numbers in 3 different cytotypes clearly established polyploidy in this taxon, if x=3 considered as the ancestral number. It was found that polyploidy is certainly associated with the morphological diversifications. As the chromosome numbers increased certain additional characters appeared, while, with reduction in chromosome numbers these additional characters have not been observed.
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