Family Schistosomatidae Poche, 1907

Dendritobilharzia Skrjabin & Zakharow, 1920 Dendritobilharzia rionegrensis Martorelli, 1981 Host: Fulica rufifrons Philippi & Landbeck. Site of infection: mesenteric veins.

Locality: Pellegrini Lake, Río Negro Province. Reference: Martorelli (1981).

Ornithobilharzia Odhner, 1912

Ornithobilharzia canaliculata (Rudolphi, 1849) Odhner, 1912 Hosts: Larus dominicanus Lichtenstein, L. maculipennis Lichtenstein. Site of infection: vascular system.

Locality: San Carlos de Bariloche, Río Negro Province. Reference: Szidat (1964).