Clear-dart
Guides
Euxoa declarata
clear dart
Euxoa declarata is a noctuid moth commonly known as the clear dart. Adults have a wingspan of 31–37 mm and are active from July to September with one generation per year. The species is notable for its reproductive isolation from closely related species (E. campestris and E. rockburnei), which is maintained primarily through differences in circadian mating rhythms rather than pheromone differences. Males of all three species respond to the same synthetic attractants. The species belongs to the 'declarata group' of Euxoa, a complex of interfertile sibling species that remain reproductively isolated in nature through temporal partitioning of mating activity.