Filaria tuberculata von Linstow, 1877

was described from Delichon urbicum (L.) by von Linstow (1877) for nematodes described as ‘‘a true Filaria, but since Filaria attenuata from various species of the genus Corvus has already been described, the name cannot remain’’. This ambiguous statement cannot be accepted as justification for proposing a new species, since A. attenuata has been described from a host of the family Hirundinidae. Jögis (1971) considered F. tuberculata as a junior synonym of A. attenuata. The male of Acuaria tuberculata, as described by von Linstow (1877), was characterised by two dissimilar spicules (98 and 130 lm long) distinct from those of A. attenuata, as revealed in the present study.