Simulium rufibasis Brunetti, 1911

Simulium rufibasis is distinguished from other species in the Thai tuberosum group by having pupae with conical cephalic microtubercles (Fig. 4 B) and gill filaments moderately stalked and decreasing slightly in thickness from dorsal to ventral (Fig. 7 C), females with sternite VII bearing a pair of medium-long clustered hairs, and males with the median sclerite about as long as wide and nearly parallel sided (Fig. 9 B). Further study is needed to determine if S. rufibasis in Thailand is conspecific with the type of S. rufibasis from West Bengal, India.