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The potential use of Rattus norvegicus (Mammalia, Muridae) in experimental infections with metacercariae of Paragonimus mexicanus (Digenea, Troglotematidae)
Hernández-Chea Roderico, Jiménez-Rocha Ana, Rubi Randall, and Dolz Gaby

Correspondencia: roderik123animal@gmail.com

Seven Wistar rats (Rattus norvegicus) were experimentally infected with Paragonimus mexicanus metacercariae, obtained from organs and tissues of freshwater crabs (Brachyura: Pseudothelphusidae) collected from the Caribbean of Costa Rica. Four rodents were infected orally and three by intraperitoneal injection. Eggs of P. mexicanus were found in a stool sample five months post-infection in one of the rodents infected intraperitoneally. Five out of seven rats, developed worms, three inmature, and two adult ones. Worms obtained from rats infected intraperitoneally showed development of gonads with presence of eggs in the uterus. Although the recovery rate of worms was low (media: 2.3%), the susceptibility of these rodents to this trematode species was demonstrated as mature adults of P. mexicanus were obtained from Wistar rats. The use of Wistar rats as an animal model for experimental infections in further investigations is recommended.

Odhneria odhneri Travassos, 1921 (Trematoda: Microphallidae) in Migrant Shorebirds from Patagonia, Argentina
Capasso Sofía, D'Amico Verónica, and Diaz Julia Inés

Correspondencia: capasso.sofia@gmail.com

The aim of this paper is to describe Odhneria odhneri in migratory shorebirds at Patagonian sites. A total of 48 Calidris fuscicollis, 44 Calidris bairdii, and 5 Charadrius falklandicus from several areas in Argentinean Patagonia were examined. Adult specimens of O. odhneri were obtained from the intestinal cecae of C. bairdii (P=6.8, MI=30.3), and C. falklandicus (P=20, MI=17.5). Morphological and morphometric characteristics agree with those of previous records. This is the southernmost record for the trematode O. odhneri, and the first host record for C. bairdii and Ch. falklandicus. We propose that C. bairdii may act as a dispersing agent for O. odhneri between the America's southern and northern hemispheres. Apparently, gastropod mollusks, crustaceans and birds are maintaining the life cycle of this species in Patagonia. The host, C. bairdii, has the potential of passing viable eggs of O. odhneri into the environment during their northward migration and onto their nesting sites during the boreal summer. This discovery broadens our knowledge about the range of hosts and the potential ways of dispersal of parasites along the American coast and, represents a valuable contribution to the general knowledge of shorebird parasites in South America.

Amblyomma parvitarsum (Acari: Ixodidae) parasitando dos especies de lagartos del género Liolaemus (Iguania: Liolaemidae) en Mendoza, Argentina
Castillo Gabriel, Nava Santiago, Pizarro Jesús, Acosta Juan Carlos y González-Rivas Cynthia Jessica

Correspondencia: nataliocastillo@gmail.com

Los muestreos se realizaron en Paramillo (Departamento de Las Heras, Provincia de Mendoza) durante abril de 2017. Se examinaron dos ejemplares adultos, uno de Liolaemus ruibali Donoso-Barros y uno de Liolaemus yalguaraz Abdala, Quinteros y Semhan. Se colectaron tres larvas de Amblyomma parvitarsum Neumann, 1901 en L. ruibali y cuatro en L. yalguaraz. Estos hallazgos de A. parvitarsum en estas dos especies de lagartos representan los primeros registros de estas asociaciones parásito-hospedador para Argentina.

Hallazgo de Demodex sp. (Trombidiformes: Demodicidae) en coprolitos de Lama guanicoe del sitio arqueológico CCP7 (Santa Cruz, Argentina)
Fugassa Martín, Petrigh Romina y Martínez Pablo

Correspondencia: mhfugassa@hotmail.com

El presente trabajo comunica el hallazgo de un ectoparásito en una muestra de coprolitos de guanaco (Lama guanicoe) hallados en el sitio arqueológico Cerro Casa de Piedra 7 (CCP7) ubicado en la provincia de Santa Cruz, Argentina. Se examinaron seis coprolitos del nivel III del sitio arqueológico CCP7 (3990±80 años antes del presente). Los mismos fueron rehidratados, se procesaron por sedimentación espontánea y el sedimento fue observado bajo microscopio óptico. Se registró un ácaro vermiforme identificado como Demodex sp. La detección de Demodex sp. en coprolitos sugiere manifestaciones patológicas del ácaro sobre su hospedador. Este es el primer registro de Demodex para guanacos y también en coprolitos a nivel global.