(i) Acuaria anthuris (Rudolphi, 1819)

Railliet, Henry & Sisoff, 1912 [syns A. depressa (Schneider, 1866) Railliet, Henry & Sisoff, 1912; A. nebraskensis Williams, 1929; A. corvicola Johnston & Mawson, 1941;

Acuaria ornata (Gendre, 1912) Railliet, Henry & Sisoff, 1912] was described based on materials from Corvus frugilegus L., Garrulus glandarius (L.), Coracias garrulus L. and Oriolus oriolus (L.). Subsequently, it has been reported mainly in birds of the family Corvidae (Passeriformes), but also in Sturnidae (Passeriformes) and Picidae (Piciformes) in many European countries, e.g. Spain (Illescas Gomez et al., 1993), France (Chabaud & Petter, 1961), Germany (Schneider, 1866), Slovakia and the Czech Republic (Ryšavý, 1957), Poland (Rutkowska, 1973), Kaliningradskaya Oblast’, Russia (Jögis, 1977), Bulgaria (Petrova, 1974) and Ukraine (Smogorzhevskaya, 1990), as well as, in North and Central America, Africa, Asia and Australia (see Mutafchiev et al., 2012). Mawson (1972) regarded A. attenuata, A. ornata, A. longicaudata Hsü & Hoeppli, 1931 and A. scutata Maplestone, 1931 as the ‘‘ Acuaria anthuris complex’’. Quentin et al. (1972) considered A. depressa described from Corvus cornix L. in Egypt as a valid species, although many authors synonymized it with A. anthuris . Smogorzhevskaya (1990) listed A. ornata, described from Corvus albus Statius Muller (= Corvus scapulatus Daudin) in Benin, as a valid species occurring in the Ukraine. This study reveals A. attenuata as a distinct species, but we agree with Mawson (1972) that Acuaria spp. parasitising Corvidae need further studies in view of their morphological similarity.