Family Mesopodagrionidae

The family has just one genus including two species, with the larva of Mesopodagrion tibetanum McLachlan having been described (Yu 2016). They inhabit mountain streams from 500–2700m in southern China, and northern Myanmar and Thailand. They bear unique lateral tufted projections arising from the postocular lobes (Fig. 12) and the prementum is shout and broad, with convex lateral margins only slightly expanded anteriorly and with a shallow but distinct anterior median lobe with short median cleft (Fig. 13). As in Argiolestidae, the caudal gills are foliate and arranged in a horizontal fan (Fig. 12) but there are numerous points of difference between Mesopodagrion and Podolestes (Figs 14, 15), the only argiolestid genus known from mainland Asia.