n. Sp. (Nematoda: Physalopteridae) from (Hamilton) (Osteichthyes: Synbranchidae) in India, with Notes on the Taxonomy of Spp.

A new nematode species, n. sp. (Physalopteridae), is described from the stomach and intestine of the freshwater fish (Hamilton) (Synbranchidae) in Bijnor district, Uttar Pradesh, India. It is mainly characterized by the lengths of spicules (468 - 510 μm and 186 - 225 μm), the postequatorial vulva without elevated lips, the presence of pseudolabial lateroterminal depressions and by the number and arrangement of caudal papillae. This is the first representative of the genus reported from a synbranchiform fish. Another new congeneric species, n. sp. is established based on a re-examination of nematodes previously reported as . (Ortlepp, 1922) from (Hamilton) (Ophichthidae) in Thailand; ovoviviparity in this species is a unique feature among all physalopterids. Bilqees et Khanum, 1970 is designated as a and the nematodes previously reported as . from (Lacépède) in India are considered to belong to . Gupta et Duggal, 1989. A key to species of Travassos, 1919 is provided.