Family Eucotylidae Teixeira de Freitas, 1951

Tanaisia Skrjabin, 1924

Tanaisia fedtschenkoi Skrjabin, 1924

Hosts: Larus cirrocephalus Vieillot, L. maculipennis Lichtenstein. Site of infection: not reported.

Locality: Mar del Plata city, Buenos Aires Province. Reference: Labriola & Suriano (2001).

Tanaisia serrata Szidat, 1961

Host: Fulica leucoptera Vieillot.

Site of infection: kidney and ureter.

Locality: Quequén River, Buenos Aires Province. Reference: Szidat (1961).