sp. n. (Platyhelminthes: Monogenoidea) infecting gills of Hamilton, 1822 (Pisces: Cyprinidae) from a global biodiversity hotspot - Arunachal Pradesh (India).

AIM

This study was a part of an ongoing parasitological survey to investigate the health status of hill stream fish in river systems of Arunachal Pradesh - A global biodiversity hotspot.

MATERIALS AND METHODS

During the 2013/2015, 18 live specimens of (Cyprinidae) were captured from the local rivers of Arunachal Pradesh and examined for parasitic monogenoids. These fish, with their flatworms, were immediately fixed in hot (60°C) 4% formalin for later examination. Identification and morphometric description used in this study followed Gussev (1976). Type specimens were deposited in the British Natural History Museum, UK.

RESULTS

sp. n. is described and illustrated from specimens of (Hamilton, 1822) from Arunachal Pradesh, India. The new species is characterized by a combination of the following characters: Copulatory tube coiled in 1½ counterclockwise rings, vagina consisting of a vaginal tube and vaginal pore, a complex sclerotized plate of unknown function in between male copulatory organ and vagina, and an anteromedial knob-like process on the dorsal bar.

CONCLUSION

sp. n. is the fourth species of described from the Northeast India and brings the total number of species of in Indian waters to 56. represents a new host record for spp., and possibly the first report for any parasite.