A new species of Stilestrongylus (Nematoda, Heligmonellidae) from the Atlantic Forest of Misiones, Argentina, parasitic in Euryoryzomys russatus (Cricetidae, Sigmodontinae)
A new species of Heligmonellidae (Trichostrongylina, Heligmosomoidea), Stilestrongylus kaaguyporai n. sp. is described from the small intestine of Euryoryzomys russatus (Rodentia, Cricetidae, Sigmodontinae) from the Argentine Atlantic Forest, in the Misiones province. The new species was found at Campo Anexo Manuel Belgrano, Reserva de Vida Silvestre Urugua-í and Parque Provincial Urugua-í, with a prevalence of 73% in 15 hosts examined. Stilestrongylus includes 24 Neotropical species, all parasitic in rodents, mostly Sigmodontinae. Stilestrongylus kaaguyporai n. sp. can be differentiated from its congeners by the following characters: caudal bursa dissymmetrical with right lobe larger and pattern of type1–4 in both lobes, rays 6 not forming a lateral trident with rays 4 and 5, rays 8 with dissymmetrical pathway, genital cone hypertrophied with a conspicuous hood-like projection and females with a marked dorso-ventral torsion of the posterior end. This report is the second record of a Stilestrongylus species in E. russatus, increasing to nine the number of parasitic species known from this host.
KeywordsHelminths Stilestrongylus kaaguyporai n. sp. Nippostrongylinae Euryoryzomys russatus Sigmodontinae Atlantic forest
We thank Carlos Galliari, Ulyses Pardiñas, María del R. Robles, Marcela Lareschi, Juliana Sánchez, Natalia Guerreiro Martins, Cecilia Ezquiaga, Jorge Barneche and Julio Torres for their cooperation in the host collections; Carlos Galliari and Ulyses Pardiñas for the identification of the hosts; María Laura Morote for her assistance with the drawings; Graciela T. Navone and María del R. Robles for useful comments on the ms and the Misiones people for allowing us to work in their forest, through the Ministerio de Ecología y Recursos Naturales Renovables de la Provincia de Misiones.
Field and laboratory activities were economically supported by grants from Agencia Nacional de Promoción Científica y Tecnológica (PICT 2010-0924) and Universidad Nacional de La Plata (N627 and N753 from Programa de Incentivos). We are deeply indebted to the above mentioned persons and institutions.
Compliance with ethical standards
The research has been conducted according to Argentine laws. Sample collection was carried out during fieldwork under official permits granted by the Ministerio de Ecología, RNR y Turismo, Provincia de Misiones (autorización #23, Guía Tránsito 000685 and 000699). The study was carried out in accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health. The specimens obtained with methods for live capture were studied and humanely sacrificed following the procedures and protocols approved by national laws (LN 14.346 and references in the provincial permits) and by the Comité de Ética of the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (Resolución 1047, sección 2, anexo II).
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