Southwell and Prasad (1918) found cysts of Trypanorhyncha in the muscles of Hilsa ilisa an estuarine fish that is known to have anadromous migratory pattern. Saxena (1980) described the occurrence of trypanorhynchan larva from freshwater fish Silonia silodia from a preserved collection of material made in the year 1948. This appears to be the first report of a trypanorhynchan larva from a freshwater fish from India.
The metacestode representing the Order Trypanorhycha from the catfish Clarias batrachus is the first report of the parasite from the northeastern region of India and that too from a newer host.
Southwell T and Prasad B. 1918 Note from the Bengal fisheries laboratory No. 4. Cestode parasite of Hilsa ilisha (Ham. Buch). Records of the Indian Museum. 15: 77-88
Saxena SK. 1980 Studies on some larval cestodes from fresh water fish in India. Revista Iberica de Parasitologia. 40: 69-80.