Host: Hydrurga leptonyx (de Blainville)
Site in host: stomach, upper intestine
Locality: Bahía San Sebastián (53 ° 17 'S, 68 ° 28 'W), Tierra del Fuego province
References: present study
Notes: About 800 adult specimens of Contracaecum sp. were collected.
Host: Mirounga leonina (Linnaeus).
Site in host: not known, worms found in scats
Locality: Elizalde Island (54 ° 41 'S, 64 ° 16 'W), Staten Island, Tierra del Fuego
References: present study
Notes: Thirteen adult specimens of Contracaecum sp. were collected in 5 fresh scats from southern elephant seals collected in Elizalde Island (Fig. 1) in August 2013 by one co-author (M.N.P.V.).