Figures: 7, 50, 61, 69, 78, 87, 223
In addition to the Ecdyonurinae characteristics, the following combination of characteristics will identify the genus:
Larvae of Darthus differ from all other Ecdyonurinae genera except Notacanthurus by the presence of a dorsal ridge on the abdomen (Fig. 7). Darthus differs from Notacanthurus by the slightly thickened anterior margin of the head capsule (as in Fig. 30) and the sickle shaped gill lamellae on segments 2-7 (Fig. 87). Additionally, Darthus is known only from the island of Borneo, whereas Notacanthurus is not known from southeast Asia.
Borneo (Fig. 223).