Based on the example of the common green lacewing, Chrysoperla camea (STEPHENS), the problems and perspectives arising from splitting a widespread species of ecological and economic importance into a number of morphologically indistinguishable sibling species are listed and commented. Chrysopids perform species specific tremulation patterns with their abdomen during courtship. After the description of three distinct song morphs in the holarctic Chrysoperla camea complex in the USA, a different set of at least three song morphs have now been identified within Europe.