Contracaecum sp.

Host: Fulica leucoptera . SI: intestine. Lo: Trelew, Chubut Province. Reference: Parona (1900) . Comment: Cited by Parona (1900) as Ascaris spiculigera Rudolphi, 1809 . There is much confusion in the literature about the many species of Contracaecum . Hartwich (1964) revised this genus and presented a list of synonyms. Among them, considered Contracaecum spiculigera (Rudolphi, 1809) and A. spiculigera synonymous of C. microcephalum . Also, he studied other specimens identified by Rudolphi (1809) as A. spiculigera, but considered these specimens as members of Contracaecum rudolphii Hartwich, 1964 .

Host: Larus dominicanus . SI: not reported. Lo: San Carlos de Bariloche (-43.05, -75.4167), Río Negro Province 1; Chubut Province 2. References: Kreiter & Semenas (1997) 1; Díaz et al. (2011a) 2. Comment: immature adult specimens 2.

Host: Phalacrocorax albiventer . SI: recovered from pellets. Lo: Punta León Reserve (-43.0778, -64.4958), Chubut Province. Reference: Malacalza et al. (1988).

Host: Phalacrocorax atriceps . SI: recovered from pellets. Lo: Punta León Reserve (-43.0778, -64.4958), Chubut Province. Reference: Garbin et al. (2019b). Comment: third and fourth stage larvae and adults specimens.

Host: Phalacrocorax brasilianus (cited as Phalacrocorax olivaceus olivaceus). SI: proventriculus. Lo: Río de La Plata 1 (unspecified Province); and Los Quiroga dam, Santiago del Estero Province 2. References: Szidat & Nani (1951) 1; Zeiss & Seigmur (1981) 2. Comment: cited as Contracaecum spiculigerum (see previous taxonomic comment).

Host: Phalacrocorax gaimardi . SI: recovered from pellets. Lo: Isla Elena (-47.75, -65.9333), Ría Deseado, Santa Cruz Province . Comment: third and fourth stage larvae and adults specimens. Reference: Garbin et al. (2019b).

Host: Spheniscus magellanicus . SI: proventriculus. Lo: Río de la Plata (-35.4333 to -41.0333; -57.1167 to -62.8), Buenos Airest Province . Material deposited: MLP–He 7465. Reference: Garbin et al. (2019a).