What are their relatives?
Leafhoppers belong to the superfamily Membracoidea, which includes three families of treehoppers: families Membracidae, Aetalionidae, and Melizoderidae. More distantly related are other members of the infraorder Cicadomorpha: cicadas (Cicadoidea) and spittlebugs (froghoppers, Cercopoidea). Other, still more distant, relatives include planthoppers, aphids, whiteflies, psyllids, scale insects, and true bugs.