Habitat requirements affect genetic variation in three species of mayfly (Ephemeroptera, Baetidae) from South Africa.

This study investigates genetic diversity in three species of Ephemeroptera, one eurytopic and therefore widespread () and two stenotopic and thus endemic ( and ) species, all of which co-occur in the southern Great Escarpment, South Africa. Mitochondrial DNA was analysed to compare the genetic diversity between the habitat generalist and the two habitat specialists. showed no indication of population genetic structure due to geographic location, while both species revealed clear genetic differentiation between geographic localities and catchments, evident from phylogenetic analyses and high F values from AMOVA.