Abstract
Heptageniidae is a family of mayflies (Ephemeroptera) distributed mainly in the Holarctic, Oriental and Afrotropical regions (Webb & McCafferty 2008). This family is Laurasian in origin and is a conspicuous component of the benthic community in the hill streams of the Western Ghats of southern India. This is a global hotspot of biodiversity endowed with a high degree of species endemism and is considered a significant reservoir of ancient lineages (Bossuyt et al. 2005).