The fresh-water fish Eutropichthyes vacha (Ham.) was collected from local fish market of district Gonda (U.P.) and examined 16 specimens, of which only 3 specimens were found infected with 17 specimens of said species. The site of infection being the gill filaments of the host. The present form differs from all the known species i.e. P. thrissocles, P. phasae, P. indica, P. pricei P. gorakhnathai, P. vinodae, P. kasiensis and P. nawabgangensis except P. kozikodiensis in shape of oral sucker, presence of pharyngeal glands, arrangements of genital hooks and number of testes. Moreover, it differs from P. kozikodiensis in clamp skeleton, shape of ovary, number of testes and shape of anchor in lappet. On subsequent study, the present form appear to be a new species of the genus Paramazocraes Tripathi, 1959 and described as a new species and named Paramazocraes guptai n. sp. in the honor of Prof. N. K. Gupta, for valuable contribution in this field.