Mating isolation in two species of Nehalennia (Zygoptera: Coenagrionidae)

Two sympatric species of Nehalennia breeding in a black spruce-sphagnum bog were effectively isolated from incorrect pairings even though attempts at intermale and interspecific associations were sometimes made. This isolation was probably due to a morphological requirement for the male’s anal appendages to mesh with the female’s mesostigmal laminae.