Two new species of the genus Rhabdochona railliet, 1916 (Nematoda: Rhabdochonidae) from the fish Tor Putitora (Cyprinidae) from Bolan, Balochistan, Pakistan

Two new nematodes belonging to the genus Rhabdochona Railliet, 1916 are described here from the intestine of the fish Tor putitora (Hamilton-Buchanan) from Bolan, Balochistan, based on male specimens. Rhabdochona cephalodiverticula n. sp., are peculiar nematodes having cephalic diverticula, projecting laterally from the buccal capsule and directed backward, a pair of cephalic papillae and 6 prostomal teeth are present in the prostome, esophagus wavy in outline, muscular much smaller than the glandular portion, spicules two, dissimilar, unequal, large spicule has a triangular cutaneous portion proximally which continues into a long portion, almost in the middle, it is separated by a delicate slit from the distal region, ending into two papillae like structures at the tip. Small spicule is spatulate, bent ventrally, broader at proximal end narrow and bifid distally, 9 pairs of pre-anal papillae and 5 pairs of post-anal papillae are present. The other species Rhabdochona bolani n. sp., has 8 prostomal teeth and a pair of cephalic papillae, muscular esophagus much smaller than the glandular esophagus, spicules two, unequal in sizes, dissimilar in morphology, large spicule curved ventrally wider anteriorly, ending into a bifurcate striated portion at the tip, enclosed in a cuticular surface, pre-anal papillae 12 pairs and post-anal 5 pairs. Small spicule almost straight with slight notch at the anterior tip and a small boat-shaped piece at posterior end. These new species differ from each other and also from all the previously described species in having combination of characters mentioned above.