Abstract
During a taxonomic study of parasites of freshwater fishes, three new gravid female nematodes of the genus Rhabdochona were recovered from the intestine of a freshwater fish, Botia dario caught from Jiri River. Detail study revealed the specimen as a medium-sized nematode, tapering at both ends with finely striated cuticle, 14 anterior teeth in the funnel-shaped prostome, vulva post-equatorially open, vagina muscular, posteriorly directed with an ovejector, eggs oval, thinshelled and embryonated, tail tip conoidly pointed. Thus, the present species is assigned to the genus Rhabdochona. Prevalence and intensity of infection is 20% (1/5) and 3(3/1) parasite per host, respectively. Comparing the relative characteristics of the two conspecies, the present species closely resembles Rhabdochona (Rhabdochona) acuminata. It differs in a few aspects such as the longer oesophagus, more anteriorly located excretory pore, longer vagina, thin-shelled eggs but smooth-shelled eggs in R.(R) acuminata, conoidly pointed tail tip but bluntly ended in R. (R.) acuminata. Based on these distinguishing characters the present species is described as a new species giving the name Rhabdochona (Rhabdochona) jiribamensis n. sp.
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