First report and molecular characterisation of Rhabdochona hospeti Thapar, 1950 (Thelazioidea: Rhabdochonidae) from tor barb, Tor tor (Hamilton) (Cyprinidae), in Assam, India.

Tor barbs, Tor tor (Hamilton), a cyprinid fish collected from Barak Valley, Assam, India were examined for helminth parasites. A nematode species of the genus Rhabdochona Railliet, 1916 (Rhabdochonidae) was found in the intestine of the fish specimens. The morphology of these nematodes was characterised by the presence of a funnel shaped prostom, head with four submedian sublabia, four cephalic papillae, long and slender posterior glandular oesophagus in both sexes, presence of 14 caudal papillae and two unequal spicules with pointed proximal tips in male specimens, and prominent post-equatorial vulval position, posteriorly directed vagina, uterus with fully scattered eggs in female specimens, and a tail pointed with a small mucron in both sexes.

sp. nov. (Nematoda: Tylenchina) from Manipur, India.

sp. nov. was collected from two different localities of Manipur.

Myxobolus leafa sp. nov. (Myxozoa: Bivalbulida) from the gill filament of Labeo bata (Hamilton) from Manipur, India.

Objective: The aim of this study was to investigate the gill filaments of Labeo bata in India parasitologically and to describe the new Myxozoa parasite species, Myxobolus leafa sp. nov., which was determined.

Record of the species of Tripartiella (Lom, 1959) from fishes of Manipur.

Survey on Trichodinid ciliophorans from the fresh water fishes of Manipur revealed three known species of the genus Tripartiella from the gills of major carps Labeo rohita (Hamilton); Cirrhinus mrigala (Hamilton); Catla catla and Ciprinus carpio. These are redescribed in this communication.