Summary
The life-cycle of Trichobilharzia australis n.sp. from northern Australia is outlined and the morphology of each stage described. Adult worms occur in the nasal blood vessels of the black duck (Anas superciliosa Gmelin, 1789). Cercariae develop in a lymnaeid snail, Austropeplea vinosa (Adams & Angus, 1864) (= Lymnaea lessoni Deshayes in part).
In order to compare T. australis with related forms, the genus Trichobilharzia is reviewed and characters discussed which have been used to distinguish between species. Morphological features of miracidia and cercariae are generally of little use in this respect. Adult worms offer several morphological features which are of some value. Principal among these are the shape of the egg in the female and the point of reunion of the caeca in the male. More emphasis is placed on life-cycle details in distinguishing between species. These details include the family to which the snail host belongs and the site occupied within the final host. An annotated key is provided to species for which life-cycles are known using life-cycle details as principal characters. Morphological details of the adult are used as secondary characters. As the life-cycles of many species are unknown, a second annotated key, using primarily morphological features, is provided to distinguish between these. A number of described species are regarded as species inquirendae.
T. australis is closest to T. aureliani Fain, 1955, a species described from the nasal blood vessels of birds in central Africa.
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Blair, D., Islam, K. The life-cycle and morphology of Trichobilharzia australis n.sp. (Digenea: Schistosomatidae) from the nasal blood vessels of the black duck (Anas superciliosa) in Australia, with a review of the genus Trichobilharzia . Syst Parasitol 5, 89–117 (1983). https://doi.org/10.1007/BF00049237
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DOI: https://doi.org/10.1007/BF00049237