Wallagotrema indicus n.sp., a new monogenean from the freshwater sheat-fish Wallagu attu Bloch and Schneider.

The paper describes Wallagotrema indicus n.sp., a freshwater monogenean recovered from the gill filaments of the freshwater sheat-fish Wallago attu Bloch and Schn. It is characterized by the number of head organs, an accessory piece on the cirrus, wings on the anchors and a beak-like outgrowth on the dorsal anchors, together with numerous other differences in the shape and size of various body parts. On the basis of these findings, the generic diagnosis of Wallagotrema is amended and a key to the various species of this genus is appended.