Two new host records of the cymothoid isopods from Rameswaram Island, southeast coast of India.

Cymothoid isopods are parasitic crustaceans that are considered as a potential threat to the health of different fish species, which eventually lead to economic loss to the fisherman's society. For the first time, cymothoid isopods Nerocila sundaica and Nerocila poruvae infested on the two new host fish species viz., Eleutheronema tetradactylum and Setipinna taty, which were collected from Rameswaram Island, Southeast coast of India. Being an ectoparasite, N. sundaica was found attached on the gill chamber of E. tetradactylum, while N. poruvae was attached on the body surface of S. taty. The standard length 10-250 cm body mass was established for the new host species, and the parasitologic indexes were calculated. © Indian Society for Parasitology 2020.