The nymph of Hermanellopsis arsia Savage amp; Peters, 1983 (Ephemeroptera: Leptophlebiidae) from Brazilian Northeastern Region.

Hermanellopsis Demoulin, 1955 is a genus of Leptophlebiidae known from adults of both sexes and is represented solely by two species, both from South America: Hermanellopsis arsia Savage Peters, 1983, described only from male subimago; and H. incertans (Spieth, 1943) described from male imago and female subimago. Edmunds et al. (1976) provided the generic description for the supposed nymph of Hermanellopsis. However, Savage Peters (1983) revised the genus, and study of related genera raised doubt about the identity of the proposed nymph. Thus, the nymph of Hermanellopsis has remained unknown until now.