Abstract
The morphology of Trichobilharzia parocellata from the portal and mesenteric blood vessels of Anas gibberifrons and A. superciliosa from northern Australia is described. The life-cycle was completed in domestic Muscovy ducks exposed to Cercaria parocellata from naturally infected Lymnaea lessoni. Adults of T. parocellata are distinguished from closely related species by the point of caecal reunion in the male, the number of testes, the nature of the tegument and the species of snail hosts. The miracidia differed from all others in the genus except T. indica in having a pair of coarsely granular posterior secretory glands, a pair of apical glands, a papilla on each side in front of the lateral processes and 18 to 20 germinal cells in a single germinal mass. The prepatent period of T. parocellata in Muscovy ducks was only 11 days after exposure. Pigeons did not become infected. ac]19840624
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