Nuevos registros de nematodes parásitos de Euryzygomatomys spinosus (Rodentia, Echimyidae) en la provincia de Misiones, Argentina

Although three species of nematodes have been recorded from the spiny rat Euryzygomatomys spinosus in Brazil, no helminthes have been recorded from this host in Argentina. Three taxa of nematodes from E. spinosus from Misiones province, Argentina, were identified from the helminthological collection of Museo de La Plata. Host voucher specimens refered to this material were found in the Colección Elio Massoia. The present survey contributes to the knowledge of nematode species from Echimyidae and illustrates the importance of integrating data from helminth and mammal collections.La rata espinosa Euryzygomatomys spinosus ha sido registrada como hospedador de tres especies de nematodes en Brasil. Hasta el momento, ningún helminto ha sido registrado parasitando a E. spinosus de Argentina. Nematodes no estudiados procedentes de la Provincia de Misiones, Argentina fueron hallados en la colección helmintológica del Museo de La Plata. En esta nota, esos nematodes fueron identificados y tres taxa fueron registrados. Los voucher de los hospedadores fueron encontrados en la Colección Elio Massoia. Este estudio contribuye al conocimiento sobre los nematodes de Echimyidae e invita a estudiar e integrar los datos registrados en las colecciones de helmintos y mamíferos.Centro de Estudios Parasitológicos y de Vectore

Nuevos registros de nematodes parásitos de Euryzygomatomys spinosus (Rodentia, Echimyidae) en la provincia de Misiones, Argentina

Although three species of nematodes have been recorded from the spiny rat Euryzygomatomys spinosus in Brazil, no helminthes have been recorded from this host in Argentina. Three taxa of nematodes from E. spinosus from Misiones province, Argentina, were identified from the helminthological collection of Museo de La Plata. Host voucher specimens refered to this material were found in the Colección Elio Massoia. The present survey contributes to the knowledge of nematode species from Echimyidae and illustrates the importance of integrating data from helminth and mammal collections.La rata espinosa Euryzygomatomys spinosus ha sido registrada como hospedador de tres especies de nematodes en Brasil. Hasta el momento, ningún helminto ha sido registrado parasitando a E. spinosus de Argentina. Nematodes no estudiados procedentes de la Provincia de Misiones, Argentina fueron hallados en la colección helmintológica del Museo de La Plata. En esta nota, esos nematodes fueron identificados y tres taxa fueron registrados. Los voucher de los hospedadores fueron encontrados en la Colección Elio Massoia. Este estudio contribuye al conocimiento sobre los nematodes de Echimyidae e invita a estudiar e integrar los datos registrados en las colecciones de helmintos y mamíferos.Centro de Estudios Parasitológicos y de Vectore

Helminth communities and host-parasite relationships in argentine brown rat (Rattus norvegicus)

The aims of this research were: 1) to determine the helminth parasite fauna of seventy two Rattus norvegicus (Berkenhout, 1769) individuals inhabiting poultry farms in the Pampean region of Argentina; 2) to examine the relationship between parasitism and individual characteristics of the hosts, and 3) to analyze the associations among helminths. The study was carried out in twenty-four poultry farms from autumn 2000 to winter 2001. Nematodes were found in the intestine or caecum rectum of the 74 % of rats and cestodes were found along all the intestine of the 28 % of rats. Heterakis spumosa (Travassos 1914) was a central species, whereas Syphacia muris, Yamaguti 1941, Nippostrongylus brasiliensis (Travassos 1914) and Hymenolepis diminuta (Rudolphi 1819) were satellite species. Helminths do not affect rat survival and growth of rats. Rats parasitized with H. spumosa and H. diminuta were larger and older than non-parasitized rats. The intensity of infection with H. spumosa significantly increased with rat age. Rats parasitized with Nippostrongylus brasiliensis and Syphacia muris did not differ in size and age with respect to non-parasitized ones. The mean intensity of infections per host was 33.74, 74.28, higher than 200, and 3.10 for H. spumosa, S. muris, N. brasiliensis and H. diminuta, respectively. The mean intensity of infection with H. spumosa was higher in summer than in the other seasons, while the higher mean intensity of infection with N. brasiliensis and S. muris occurred in autumn. Infections with Heterakis spumosa and Syphacia muris, and with Syphacia muris and Nippostrongylus brasiliensis were independent; while Heterakis spumosa and Nippostrongylus brasiliensis were negatively associated.Centro de Estudios Parasitológicos y de VectoresFacultad de Ciencias Naturales y Muse

Helminth communities and host-parasite relationships in argentine brown rat (Rattus norvegicus)

The aims of this research were: 1) to determine the helminth parasite fauna of seventy two Rattus norvegicus (Berkenhout, 1769) individuals inhabiting poultry farms in the Pampean region of Argentina; 2) to examine the relationship between parasitism and individual characteristics of the hosts, and 3) to analyze the associations among helminths. The study was carried out in twenty-four poultry farms from autumn 2000 to winter 2001. Nematodes were found in the intestine or caecum rectum of the 74 % of rats and cestodes were found along all the intestine of the 28 % of rats. Heterakis spumosa (Travassos 1914) was a central species, whereas Syphacia muris, Yamaguti 1941, Nippostrongylus brasiliensis (Travassos 1914) and Hymenolepis diminuta (Rudolphi 1819) were satellite species. Helminths do not affect rat survival and growth of rats. Rats parasitized with H. spumosa and H. diminuta were larger and older than non-parasitized rats. The intensity of infection with H. spumosa significantly increased with rat age. Rats parasitized with Nippostrongylus brasiliensis and Syphacia muris did not differ in size and age with respect to non-parasitized ones. The mean intensity of infections per host was 33.74, 74.28, higher than 200, and 3.10 for H. spumosa, S. muris, N. brasiliensis and H. diminuta, respectively. The mean intensity of infection with H. spumosa was higher in summer than in the other seasons, while the higher mean intensity of infection with N. brasiliensis and S. muris occurred in autumn. Infections with Heterakis spumosa and Syphacia muris, and with Syphacia muris and Nippostrongylus brasiliensis were independent; while Heterakis spumosa and Nippostrongylus brasiliensis were negatively associated.Centro de Estudios Parasitológicos y de VectoresFacultad de Ciencias Naturales y Muse

Nuevos registros de nematodes parásitos de Euryzygomatomys spinosus (Rodentia, Echimyidae) en la provincia de Misiones, Argentina

Although three species of nematodes have been recorded from the spiny rat Euryzygomatomys spinosus in Brazil, no helminthes have been recorded from this host in Argentina. Three taxa of nematodes from E. spinosus from Misiones province, Argentina, were identified from the helminthological collection of Museo de La Plata. Host voucher specimens refered to this material were found in the Colección Elio Massoia. The present survey contributes to the knowledge of nematode species from Echimyidae and illustrates the importance of integrating data from helminth and mammal collections.La rata espinosa Euryzygomatomys spinosus ha sido registrada como hospedador de tres especies de nematodes en Brasil. Hasta el momento, ningún helminto ha sido registrado parasitando a E. spinosus de Argentina. Nematodes no estudiados procedentes de la Provincia de Misiones, Argentina fueron hallados en la colección helmintológica del Museo de La Plata. En esta nota, esos nematodes fueron identificados y tres taxa fueron registrados. Los voucher de los hospedadores fueron encontrados en la Colección Elio Massoia. Este estudio contribuye al conocimiento sobre los nematodes de Echimyidae e invita a estudiar e integrar los datos registrados en las colecciones de helmintos y mamíferos.Centro de Estudios Parasitológicos y de Vectore

Niveles de infección de helmintos de Rattus rattus (Rodentia: Muridae) en la ciudad de Corrientes, Argentina

The aim of this study was to describe the infection levels of helminths of Rattus rattus in Corrientes city, Corrientes Province, Argentina. In order to determine the role of rodents as potential reservoirs for zoonotic parasites, different indices of helminth infection were assessed with respect to sex, age, season and urban landscapes. A total of 107 individuals of R. rattus were examined. Seven species of helminths were found. The values of total prevalence, mean intensity and mean abundance were 68%, 20 and 13, respectively. Nippostrongylus brasiliensis was the species more prevalent and abundant. The results showed that the age of the rodents and the season of capture had effects on the helminth infection.El objetivo del trabajo fue describir los niveles de infección de Rattus rattus en la ciudad de Corrientes, provincia de Corrientes, Argentina. Con el objetivo de determinar el rol de los roedores como reservorios potenciales de parásitos zoonóticos, se analizó la distribución de helmintos respecto al sexo, edad, estación del año y ambientes urbanos. Un total de 107 individuos de R. rattus fueron examinados. Se identificaron siete especies de helmintos. Los valores de prevalencia total, intensidad media y abundancia media fueron 68%, 20 y 13, respectivamente. Nippostrongylus brasiliensis fue la especie más prevalente y abundante. Los resultados demostraron que la edad de los roedores y la estación del año tuvieron efectos en la infección con helmintos.Facultad de Ciencias Naturales y Muse

Niveles de infección de helmintos de Rattus rattus (Rodentia: Muridae) en la ciudad de Corrientes, Argentina

The aim of this study was to describe the infection levels of helminths of Rattus rattus in Corrientes city, Corrientes Province, Argentina. In order to determine the role of rodents as potential reservoirs for zoonotic parasites, different indices of helminth infection were assessed with respect to sex, age, season and urban landscapes. A total of 107 individuals of R. rattus were examined. Seven species of helminths were found. The values of total prevalence, mean intensity and mean abundance were 68%, 20 and 13, respectively. Nippostrongylus brasiliensis was the species more prevalent and abundant. The results showed that the age of the rodents and the season of capture had effects on the helminth infection.El objetivo del trabajo fue describir los niveles de infección de Rattus rattus en la ciudad de Corrientes, provincia de Corrientes, Argentina. Con el objetivo de determinar el rol de los roedores como reservorios potenciales de parásitos zoonóticos, se analizó la distribución de helmintos respecto al sexo, edad, estación del año y ambientes urbanos. Un total de 107 individuos de R. rattus fueron examinados. Se identificaron siete especies de helmintos. Los valores de prevalencia total, intensidad media y abundancia media fueron 68%, 20 y 13, respectivamente. Nippostrongylus brasiliensis fue la especie más prevalente y abundante. Los resultados demostraron que la edad de los roedores y la estación del año tuvieron efectos en la infección con helmintos.Facultad de Ciencias Naturales y Muse

Morphological and Molecular Characterization of a New Trichuris Species (Nematoda- Trichuridae), and Phylogenetic Relationships of Trichuris Species of Cricetid Rodents from Argentina

Populations of Trichuris spp. isolated from six species of sigmodontine rodents from Argentina were analyzed based on morphological characteristics and ITS2 (rDNA) region sequences. Molecular data provided an opportunity to discuss the phylogenetic relationships among the Trichuris spp. from Noth and South America (mainly from Argentina). Trichuris specimens were identified morphologically as Trichuris pardinasi, T. navonae, Trichuris sp. and Trichuris new species, described in this paper. Sequences analyzed by Maximum Parsimony, Maximum Likelihood and Bayesian inference methods showed four main clades corresponding with the four different species regardless of geographical origin and host species. These four species from sigmodontine rodents clustered together and separated from Trichuris species isolated from murine and arvicoline rodents (outgroup). Different genetic lineages observed among Trichuris species from sigmodontine rodents which supported the proposal of a new species. Moreover, host distribution showed correspondence with the different tribes within the subfamily Sigmodontinae.Centro de Estudios Parasitológicos y de VectoresFacultad de Ciencias Veterinaria

Editorial: helminth biodiversity

The aim of this Research Topic is to broaden and deepen the knowledge about helminths in wildlife or domestic hosts around the world focusing on the contribution to the taxonomic groups, ecology, phylogenetic, and biology. Thus, a multidisciplinary approach is given and can be used as a guide for scientific information. In this special collection, there are seven papers covering the differents aspects.Centro de Estudios Parasitológicos y de Vectore

A new species of Trichuris Roederer, 1761 (Nematoda: Trichuridae) from <i>Heteromys gaumeri</i> Allen & Chapman (Rodentia: Heteromyidae) in Yucatan, Mexico

In Mexico, four species of Trichuris Roederer, 1761 have been recorded in wild rodents belonging to the family Heteromyidae. In the present paper, we describe a new species based on specimens collected from Heteromys gaumeri Allen & Chapman (Heteromyidae: Heteromyinae) in the tropical forests of the Yucatan Peninsula, Mexico. Trichuris silviae n. sp. can be differentiated from the congeners described in North and South American rodents by morphological and morphometric features, such as the possession of a wide spicular tube, a thicker proximal cloacal tube, a shorter distal cloacal tube and a cylindrical spicular sheath. This is the first description of a Trichuris spp. from heteromyid rodents in Mexico and the fourth in North America. Despite the broad distribution of Heteromys spp., few cases of Trichuris infection have been reported. Further studies are necessary to verify if the new species is present in other heteromyid rodents in order to increase our knowledge about its geographical and host distribution.Centro de Estudios Parasitológicos y de Vectore