The present paper deals with the redescriptions of the species of a nematode of the families, Heterocheilidae Railliet et Henry, 1915 and Camallanidae Railliet et Henry, 1915 from the intestine and stomach of marine fishes, Epinephelus areolatus (Forskål), Tachysurus tenuispinis (Day), Johnius diacantus (Lecépède), Ilisha filigera (Valenciennes), Pomadasys maculatus (Blooch). Dasyatis (Himantura) uarnak (Forskål), Pterois russelli Bennett, Scoliodon sorrakowah (Cuvier) and Carangoides malabaricus Bloch and Schneider from Visakhapatnam and Kakinada (Andhra Pradesh). Most of the characters tally with Raphidascaris chirocentri Yamaguti, 1935, Paranisakis pastinacae (Rud., 1819) Baylis, 1936 and Paracamallanus theraponis Kalyankar, 1970, but differs from it body measurements, oesophagus length, location of the nerve ring, length of the tridents, possession of striations, shape and position of the vulvar process and size of the eggs. Except for these minor variations, in all other characters there is agreement with above species. Because of the non-availability of the male, it is not possible to assign the present specimens to any of the known species of the genus Raphidascaris, Paranisakis and Paracamallanus. Hence these are referred as Raphidascaris sp., Paranisakis sp. and Paracamallanus sp. Dasyatis uarnak, Pterois russelli, Scoliodon sorrakowah and Carangoides malabaricus are new host records. Visakhapatnam and Kakinada are the new locality records.
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