Family Cyclocoelidae Kossak, 1911

Cyclocoelum Brandes, 1892

Cyclocoelum (Cyclocoelum) mutabile (Zeder, 1800)

Syns.: Monostomum mutabile Lahille, 1918

Cyclocoelum paradoxum Marcó del Pont, 1926 Cyclocoelum lahillei Dollfus, 1948

Hosts: Fulica armillata Vieillot, Fulica sp., Gallinula chloropus galeata (Lichtenstein), Pardirallus mac­

ulatus maculatus (Boddaert) .

Site of infection: air sacs.

Localities: La Plata Zoological Garden, La Plata; Delta del Paraná, Buenos Aires Province. References: Lahille (1918), Marcó del Pont (1926), Szidat (1963b).

Cyclocoelum (Cyclocoelum) microstomum (Creplin, 1829) Host: Fulica armillata Vieillot.

Site of infection: not reported.

Locality: Río de la Plata, Buenos Aires Province.

Life history: Hi1 and Hi2: Heleobia parchappei (d’Orbigny) from Quequén River, Buenos Aires Province;

metacercariae encysted in visceral cavity.

Reference: Szidat (1963b).

Hyptiasmus Kossack, 1911

Hyptiasmus brumpti Dollfus, 1948

Syn.: H. oculeus de Szidat & Szidat, 1966

Host: Fulica leucoptera Vieillot.

Site of infection: nasal and infraorbital cavities. Locality: Quequén River, Buenos Aires Province. Life history: Hi1: Heleobia parchappei (d’Orbigny) (natural host) from Quequén River, Buenos Aires

Province.

References: Szidat (1963a), Szidat & Szidat (1966).