No published records of acoustic communication in the brown lacewings exist, even though the family includes some 550 species (Oswald, 1993). However, I have personally observed receptive males of Hemerobius sp. vibrating their abdomens in a temporally structured manner, much like Chrysopidae. Until very recently, hemerobiids and chrysopids have been treated as sister taxa, so the simplest hypothesis explaining the presence of tremulation in brown lacewings is the inheritance of that trait from a most recent common ancestor with green lacewings. However, Aspock et al. (2001) challenged that view on morphological grounds, arguing instead for a closer relationship of Chrysopidae with Osmylidae (but see Haring and Aspock, 2004, for a molecular alternative). In any case, relationships among the families of Hemerobiiformia are sufficiently uncertain to preclude accurate tracing of signal evolution within the suborder.
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