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RODENTOLEPIS MICROSTOMA ISOLATED FROM DIFFERENT SPECIES OF SIGMODONTINAE RODENTS (RODENTIA: CRICETIDAE) IN THE CUENCA DEL PLATA, ARGENTINA: MORPHOLOGICAL ASPECTS AND MOLECULAR CHARACTERIZATION
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Universidad Nacional de La Plata. Centro de Estudios Parasitológicos y de Vectores (CEPAVE). Buenos Aires, Argentina.
Universidad Nacional de La Plata. Centro de Estudios Parasitológicos y de Vectores (CEPAVE). Buenos Aires, Argentina.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Vertebrados. Rio de Janeiro, RJ, Brasil.
Universidad Nacional de La Plata. Centro de Estudios Parasitológicos y de Vectores (CEPAVE). Buenos Aires, Argentina.
Universidad de Sevilla. Facultad de Farmacia. Departamento de Microbiología y Parasitología. Sevilla, Spain.
Universidad Nacional de La Plata. Centro de Estudios Parasitológicos y de Vectores (CEPAVE). Buenos Aires, Argentina.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Vertebrados. Rio de Janeiro, RJ, Brasil.
Universidad Nacional de La Plata. Centro de Estudios Parasitológicos y de Vectores (CEPAVE). Buenos Aires, Argentina.
Universidad de Sevilla. Facultad de Farmacia. Departamento de Microbiología y Parasitología. Sevilla, Spain.
Abstract
The purpose of this paper was to study specimens of the genus Rodentolepis isolated from eight species of Sigmodontinae
rodents (Rodentia: Cricetidae) from six provinces in the Cuenca del Plata, Argentina, based on
morphological, morphometric and molecular characteristics (ITS1 rDNA and cox1 mtDNA). The genetic distances
among studied specimens and other Hymenolepididae from rodents available in the GenBank were analyzed and
phylogenetic inferences were provided. A total of 955 specimens of Sigmodontinae rodents were examined from
seven localities of six provinces in the Cuenca del Plata region in Argentina. Tapeworms were removed from the
rodents’ small intestines. Conventional studies were used for the morphological and molecular analysis. Specimens
of R. microstoma were identified. An amended diagnosis and detailed morphological description of this
species is provided. The molecular analyses showed that the specimens studied form the same clade as that of
R. microstoma previously studied from other hosts and regions. The genetic polymorphisms of R. microstoma
observed corresponded to different groups of species hosts and regions. Moreover, eight species of sigmodontine
rodents and 33 localities from the Cuenca del Plata region in Argentina constitute new host and geographical
records. This study shows the importance of using integrative taxonomic approaches that combine morphological
and molecular characters to understand biological diversity. Moreover, the discovery of R. microstoma in humans
suggests the importance of further studies on this zoonotic cestode. This study provides important data on the
taxonomy and distribution of R. microstoma to advance knowledge of the transmission dynamics of this parasite.
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