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Existen diversas estimaciones sobre el número total de especies en el mundo. Las más prudentes oscilan de 5 millones a 50 millones, aceptando que las publicadas están cerca de 1,9 millones (Chapman, 2009) y actualmente, 2,2 millones. El Catálogo de la Vida (Catalogue of Life), del que participan más de 3.000 taxónomos, integró listas formuladas a partir de 168 bases de datos, estimando -en 2018- 1.656.915 especies, de las cuales 1.374.233 fueron aceptadas o provisionalmente aceptadas por los taxónomos que participan de este esfuerzo (Roskov et al., 2018). En 2020, esa estimación se elevó a 1.978.800 de especies vivientes y 59.284 extintas antes y durante el Holoceno (Catalogue of Life 2021). Es decir, se computaron las extinciones provocadas -directa e indirectamente- por causas humanas desde el año 1600 al presente. Según la UICN (Unión Internacional para la Conservación de la Naturaleza) (2021) el número de especies extintas referidas a ese período asciende a unas 120 de plantas y 800 de animales (Tablas 1 y 2). Paralelamente, hay unas 80 especies extintas en estado silvestre y muchas formas o razas domésticas -incluyendo algunas de alto valor económico- se están extinguiendo (FAO, 2015). Por ejemplo, de las 6.190 razas de mamíferos ya se han extinto 559 (más del 9%) y de las que quedan hay al menos mil amenazadas (Díaz et al., 2019). Pese a esta riqueza biológica nos toca ser contemporáneos -y testigos- de un tiempo signado por especies amenazadas y extinciones muy por encima de la tasa natural. A tal punto que ya no suena exagerado hablar de una "sexta extinción masiva". Recientemente, el Panel IPBES (Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services) llamó la atención del mundo ratificando que las acciones humanas han elevado -y acelerado- la tasa de extinción global de especies silvestres a un ritmo nunca visto en los últimos 10 millones de años. A tal punto que un 25% de las especies en los grupos de animales y plantas evaluados por la UICN están amenazados. Esto sugiere que ?si se consideran las estimaciones del total de especies presentes en la Tierra- habría un millón de especies que se enfrentan a la extinción inducida por nuestra especie. En América ese porcentaje de especies amenazadas coincide sobre las 14.000 evaluadas (IPBES, 2018).En la Argentina habitan más de 300 especies amenazadas a escala global. Es decir, en alguna de estas categorías: -extinta en estado silvestre-, -en peligro crítico-, -en peligro- o -vulnerable- según UICN (2019). Tres invertebrados (del género Aylacostoma) y una planta (Senecio leucopeplus) se encuentran -extintas en estado silvestre-, y un coleóptero (Rhantus orbignyi), un marsupial (Cryptonanus ignitus) y dos cánidos (Dusicyon avus y Dusicyon australis) están -extintas- a la misma escala mundial. Sin embargo, la escala de este tipo de base de datos excluye otros taxones en las que repara el presente inventario biológico de la Argentina.Si bien los avances tecnológicos al servicio de la comunicación son deslumbrantes, la mayor parte de la sociedad desconoce el valor de la biodiversidad desde sus diferentes puntos de vista: científico, ético, estético, económico, cultural y ecológico (López, 1999). Tampoco percibe la trascendencia de los bienes y servicios de los ecosistemas silvestres, tal vez, porque son brindados de modo cotidiano, silencioso y gratuito (Bertonatti, 2017). Sin embargo, una reciente evaluación económica de la contribución de los ecosistemas terrestres a los ciudadanos de toda América ha estimado en no menos de 24,3 trillones de dólares al año. Es decir, el equivalente al producto bruto interno (PBI) de toda la región (IPBES, 2018). Pese a ello, en general la ciudadanía y, en particular, los gobernantes no alcanzan a dimensionar el problema que acarrea el deterioro ambiental y las implicancias del mismo. Es esperable, entonces, que ante un diagnóstico deficiente resulte inadecuado el tratamiento gubernamental para resolver estos desafíos.En esta trama global de crisis es crucial conocer científicamente el elenco de taxones de cada jurisdicción política (municipal, provincial, nacional y regional), su determinación sistemática, su distribución geográfica y su función ecológica. Sin embargo, hasta el presente ese conocimiento es fragmentario, incompleto y desactualizado en la mayoría de los países del mundo. Fil: Teta, Pablo Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Abba, Agustin Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina Fil: Cassini, Guillermo Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Flores, David Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Vertebrados; Argentina Fil: Galliari, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina Fil: Jayat, Jorge Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina Fil: Lucero, Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Pereira, Javier Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina

Los objetivos de este trabajo fueron presentar una lista de helmintos de especies de roedores simpátricos (Muroidea, Cricetidae) de la ciudad de Corrientes, ecorregión del Chaco Húmedo, Argentina, y recopilar registros y datos ecológicos de las especies hospedadoras. Catorce especies de helmintos fueron hallados en un ensamble de 6 roedores. Cinco nuevos hospedadores y 12 nuevos registros geográficos son reportados para la región del Chaco Húmedo. El mayor valor de prevalencia corresponde a Stilestrongylus stilesi, Hassalstrongylus mazzai, H. argentinus y Mazzanema fortuita, y los mayores valores de abundancia media e intensidad media corresponde a S. stilesi de Necromys lasiurus. Los Nippostrongylinae fue el grupo dominante en todas las especies de roedores. Se presentan los descriptores ecológicos de la comunidad componente (riqueza, número total de especímenes parásitos, índice de diversidad, equitatibilidad y dominancia). El valor más elevado del índice de riqueza fue observado para N. lasiurus (S = 6). El índice de diversidad alcanzó valores entre 1.11 en Holochilus chacarius y 0.16 in Akodon azarae. El índice de equitatibilidad presentó valores mayores para Oligoryzomys flavescens (0.96) y H. chacarius (0.81). Los valores más altos de dominancia de Berger-Parker fueron observados en A. azarae (0.96), seguido por N. lasiurus (0.86). El presente trabajo contribuye al estudio taxonómico y ecológico de las relaciones parásito-hospedador, proporcionando información sustancial a una de las ecorregiones más afectadas por las acciones antrópicas en Argentina. The aims of this paper were to list the helminths from sympatric rodent species (Muroidea, Cricetidae) in Corrientes city, Humid Chaco ecoregion, Argentina and summarise the record and ecological data on six host species. Fourteen species of helminths were found in 6 rodent assemblages. Five new hosts and 12 new geographical reports from Humid Chaco ecoregion are provided. The higher prevalence values corresponded to Stilestrongylus stilesi, Hassalstrongylus mazzai, H. argentinus and Mazzanema fortuita, and the higher mean abundance and mean intensity values corresponded to S. stilesi from Necromys lasiurus. Nippostrongylinae was the dominant group within each host species. The ecological descriptors of component communities are given. The highest value of richness index was observed for N. lasiurus (S = 6). The diversity index reached values between the range 1.11 in Holochilus chacarius and 0.16 in Akodon azarae. The equitability index shows the highest values for Oligoryzomys flavescens (0.96) and H. chacarius (0.81). The highest value index of dominance of Berger-Parker was observed for A. azarae (0.96) followed by N. lasiurus (0.86). This study contributes to the taxonomic and ecological of the parasite-host relationships, providing substantial information to one of the ecoregions most affected by anthropic actions in Argentina. Fil: Gómez Muñoz, María de Los Ángeles. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas, Naturales y Agrimensura. Departamento de Biología. Laboratorio Biología de los Parásitos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina Fil: Robles, Maria del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina Fil: Milano, Alicia María Francisca. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas, Naturales y Agrimensura. Departamento de Biología. Laboratorio Biología de los Parásitos; Argentina Fil: Digiani, Maria Celina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Zoología Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina Fil: Notarnicola, Juliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú; Argentina Fil: Galliari, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina Fil: Navone, Graciela Teresa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina

Jesematathla y Waikthlatingmayalwa son dos localidades típicas de roedores cricétidos emplazadas en el Chaco de Paraguay. En la primera fueron coleccionados los holotipos de Akodon toba y Oryzomys wavrini; en la segunda, Akodon lenguarum y Phyllotis chacoënsis. La ubicación geográfica exacta de estas localidades es aún discutida, aspecto que se intenta clarificar en esta nota. Los resultados obtenidos indican que ambas se emplazan en el Chaco Húmedo. Jesematathla se corresponde hoy día con la Estancia Yesamathasa. Waikthlatingmayalwa ha desaparecido como topónimo, en favor de Misión Central y solo debe conservarse a los fines históricos. Se discuten brevemente las implicaciones taxonómicas de estos hallazgos. Jesematathla and Waikthlatingmayalwa are two type localities of cricetid rodents from the Paraguayan Chaco. The holotypes of Akodon toba and Oryzomys wavrini were collected in the former; whereas, Akodon lenguarum and Phyllotis chacoënsis were obtained in the latter. The exact geographic location of both localities is controversial, and the goal of this note is to clarify the issue. We show that both localities are located in the Humid Chaco. Jesematathla corresponds today to the Estancia Yesamathasa. Waikthlatingmayalwa disappeared as a toponym, replaced by Misión Central and should be retained solely for historical purposes. The taxonomic implications of these findings are briefly discussed.

Platynosomoides sp. Site of infection. small intestine, bile duct Collection number. MLP-He 7324 Host species. Akodon montensis. CG 169 Localities: RVSU and PPU Comments. The morphological characters observed in the specimens agree with the description given by Yamaguti (1971) of the genus Platynosomoides, i.e. long and narrow caeca, reaching far beyond middle of body; testes posterolateral to ventral sucker; median genital pore anterior to intestinal bifurcation; ovary posterior to testes and vitelline glands forming lateral bands starting at level of ventral sucker. The genus Platynosomoides sp. has not been mentioned parasitizing sigmodontine rodents until today. However, it was recorded for Leopoldamys siporanus Thomas 1895 (Muridae) in Asia (Malaysia, Armenia and Daguestan, Russian Federation) and for Crocidura olivieri (Lesson 1827) (Soricidae) in Africa (Democratic Republic of the Congo) (Pojma&nacute;ska 2008). This is the first record of the genus for South America. Platynosomoides. A. montensis * " akodontis A. montensis A. cursor A. montensis N. " # $ % &’() * et al. +,&& ! lasiurus O. nigripes O. rufus baine S. angouya S. angouya !­./ 0 et al +,&1 navonae A. montensis T. nigrita A. montensis T. nigrita !­ 0 +,&& 0 et al. +,&1 travassosi N. squamipes * O. nigripes # $ 2 et al &’’+ Trichuris E. russatus * Eucoleus 3&4 A. montensis * Eucoleus 3+4 Brucepattersonius * coronatum A. montensis * E. russatus * O. 5!$ Holochilus brasiliensis $ " 6 76 et al. &’’) nigripes * S. angouya * ! Tapirus terrestris. 2 #" . ulysi E. russatus * S. angouya S. angouya !­ 6 et al. +,&+ . zetta O. nigripes 5!$ A. cursor E. russatus N. $ 2/ 2 # $ 8 &’9) et al. &’:+ squamipes Cerradomys !­ 2 +,,9 * et al +,&& subflavus O. nigripes Galea 6 et al +,&+ * et al. +,&+ spixii; < et al. +,&( . epsilon N. squamipes O. nigripes * 5!$ A. cursor N. squamipes 2/ # $ 8 &’9) 6 76 &’)& et al &’:+ 2 et al. &’:1! et al +,,( ......continued on the next page 35 4 lenti A. montensis 5!$ A. cursor A. montensis A. # $ $ " 8 5 = 6 76 &’’&! simulator O. flavescens O. => &’’+ 6 et al. +,,) nigripes * et al +,&& aculeata A. montensis 5!$ A. cursor A. montensis # $ 8 &’9) 2 +,,9 * et al. +,&& lanfrediae E. russatus * O. nigripes S. 5!$ A. cursor A. montensis O. # $? et al +,,’ * et al. +,&& angouya * nigripes Stilestrongylus 3&4 T. nigrita * 5!$ Stilestrongylus 3+4 E. russatus * S. angouya * 5!$ 3&4 T. nigrita * 5!$ 3+4 E. russatus * 5!$ % alata T. nigrita 5!$ N. lasiurus T. nigrita " $!­./ @ &’(: &’(’ 0 +,,: +,&, 5/> $ " carlitosi A. montensis 5!$ A. azarae A. montensis A. # $!­ 0 => +,,) 0 +,&, philipmyersi * et al. +,&& evaginata E. russatus * Oryzomys sp. $" $ A = @ &’:B kinsellai O. nigripes 5!$ O. nigripes !­ 0 => +,,) venteli N. squamipes N. squamipes # $!­ 8 &’9) 0 => +,&, navonae N. squamipes O. nigripes * 5!$ A. azarae H. chacarius N../ 5A!­> +,,B squamipes O. chacoensis O. fornesi > C D $ D $ E $"D $ $ "D $ 5A D 5 5/ D 5 " D "./ D. 2/D 2 F!­ D! D 0 2D 2 #D #>D. 8 5D 8 F, Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on pages 245-247, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Yamaguti, S. (1971) Synopsis of Digenetic Trematodes of Vertebrates. Vol. I. & II. Keigaku Publishing Co, Tokyo, 1074 pp.","Pojmanska T. (2008) F amily Dicroceliidae Loos, 1899. In: Bray, R. A., Gibson, D. I. & Jones, A. (Eds.), Keys to the Trematoda. Vol. 3. CAB International y Natural History Museum, London, pp. 233 - 260."]}

Syphacia venteli Travassos 1937 Host species. Nectomys squamipes. CG44 Site of infection. caecum Collection number. MLP-He7346 Localities. CAM, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description and subsequent redescriptions given by Travassos (1937) and Robles & Navone (2010), i.e. presence of cervical and lateral alae and the absence of deirids in both sexes, equidistant mamelons, accessory hook of the gubernaculum very small and without ornamentation, and relatively long tail in males, among other morphometric features. The species was described for N. squamipes from Angra dos Reis, Rio de Janeiro Brazil. Quentin (1969) redescribed the species based on specimens from Melanomys caliginosus (Tomes 1860) (Sigmodontinae, Orizomyini) in Valle del Cauca, Colombia. Robles & Navone (2010) redescribed S. venteli based on the type specimens and other records of N. squamipes from Balneario Municipal de Aristóbulo del Valle in the stream Cuña Pirú and Puerto Península, Misiones province. In addition, Gomes & Vicente (1984) and Gomes et al. (2003) recorded this species for N. squamipes from different localities of Rio de Janeiro, Brazil., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on pages 255-256, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Travassos, L. (1937) Contribucao ao conhecimiento da Phylogynia dos Oxyuridae (Nematoda). Memorias do Instituto Oswaldo Cruz, 32, 607 - 613. https: // doi. org / 10.1590 / s 0074 - 02761937000400009","Quentin, J. C. (1969) Etude de nematodes Syphacia parasites de Rongeurs Cricetidae sudamericains et de leurs correlations biogeographiques avec certaines especes neartiques. Bulletin du Museum National D'Histoire Naturelle, 2, 909 - 925.","Gomes, D. C. & Vicente, J. J. (1984) Helmintos parasitos de Nectomys squamipes (Brants) do municipio de Sumidouro, RJ. Memorias Instituto Oswaldo Cruz, 79, 67 - 73. https: // doi. org / 10.1590 / s 0074 - 02761984000100008","Gomes, D. C., Pereira, R., Vicente, J. J. & Pinto, R. M. (2003) Nematode parasites of marsupials and small rodents from the Brazilian Atlantic Forest in the State of Rio de Janeiro, Brazil. Revista Brasileira de Zoologia, 20, 699 - 707. https: // doi. org / 10.1590 / s 0101 - 81752003000400024"]}

Nippostrongylinae sp. (1) Site of infection. small intestine. Collection number. MLP-He7335 Host species. Thaptomys nigrita. ROB159 Localities. CAMB, RVSU and PPU Comments. These specimens show some characters of the synlophe that allow them to be attributed to the Nippostrongylinae, i.e. the number of ridges (more than 13) and the ridges continuous around the body (Beveridge et al. 2013). At first, the specimens could not be assigned to any known genus in the subfamily mainly because of having a synlophe with a careen made up of two ridges of dissimilar development and a subsymmetrical caudal bursa with short dorsal lobe. The presence of a careen makes it similar to the genus Mazzanema Digiani, Notarnicola & Paulos, 2013 (monotypic) parasitic in Holochilus chacarius Thomas, 1906 (Sigmodontinae). However, other characters of the bursa and the synlophe are different from those of the sole species Mazzanema fortuita (Freitas, Lent & Almeida, 1937) and the value of these characters has still to be assessed. This is the first record of Strongylida in T. nigrita together with Stilestrongylus n. sp. (1) (see above)., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on pages 253-254, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Beveridge, I., Spratt, D. & Durette-Desset, M. C. (2013) Order Strongylida (Railliet & Henry, 1913). In: Schmidt-Rhaesa, A. (Ed.), Handbook of Zoology. A Natural History of the Phyla of the Animal Kingdom. 2. Nematoda. De Gruyter, Berlin, pp. 557 - 612. https: // doi. org / 10.1515 / 9783110274257.557","Digiani, M. C., Notarnicola, J. & Paulos, M. S. (2013) Mazzanema n. gen. and Mazzanema fortuita n. comb. for Longistriata fortuita Freitas, Lent & Almeida, 1937 (Nematoda, Heligmonellidae), a parasite of the marsh rat Holochilus chacarius (Rodentia, Cricetidae) from Northern Argentina. Journal of Parasitology, 99, 816 - 820. https: // doi. org / 10.1645 / 12 - 148.1"]}

Litomosoides navonae Notarnicola 2005 Host species. Nectomys squamipes. CG44. Oligoryzomys nigripes. CG190 Site of infection. thoracic and abdominal cavities Collection number. MLP-He7347, MLP-He7353 Localities. CAM and PPU Comments. The morphological characters observed in the specimens agree with the original description and subsequent redescriptions given by Notarnicola (2005), i.e. buccal capsule with posterior 2/3 strongly cuticularized, external margins of walls irregularly crenate, spicules corresponding to the sigmodontis group of species and conspicuous cloacal papillae with 1 pair adcloacal and 5–6 asymmetrical pairs of postcloacal papillae. This species was originally described by Notarnicola (2005) as a parasite of N. squamipes from the Reserva Natural UNLP Valle del Arroyo Cuña Pirú, Cainguás, Misiones, and of Oligoryzomys chacoensis (Myers & Carleton 1981), Holochilus chacarius and Akodon azarae from Estancia La Marcela, El Colorado, Pirané, Formosa province and of Oligoryzomys fornesi (Massoia 1973) and H. chacarius from Selvas del Río de Oro, Libertador General San Martín, Chaco province, Argentina., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 256, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Notarnicola, J. (2005) Description of adult and fourth-stage larva of Litomosoides navonae n. sp. (Nematoda: Onchocercidae), a parasite of five species of sigmodontine rodents from northeastern Argentina. Systematic Parasitology, 62, 171 - 183. https: // doi. org / 10.1007 / s 11230 - 005 - 5490 - y"]}

Stilestrongylus aculeata (Travassos 1918) Site of infection. small intestine Collection number. MLP-He7330 Host species. Akodon montensis. CG177 Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Simões et al. (2014), i.e. synlophe with 19–23 subequal ridges, asymmetrical caudal bursa with larger right lobe, bursal pattern of type 1-4 on the right lobe and 2-2-1 on the left lobe, left ray 2 especially developed, asymmetrical arising of rays 8 and spicules 370–460 long, among other morphometric characters. This species was originally described as Heligmosomum aculeatum by Travassos (1918) from Angra dos Reis, Rio de Janeiro, Brazil. This author later provided the illustration of the caudal bursa, which was not included in the former description (Travassos, 1921). The species was transferred to the genus Longistriata Schulz, 1926 (Travassos & Darriba, 1929) and, finally, to Stilestrongylus by Durette-Desset (1971) although none of these nomenclatural changes were accompanied by a redescription. Simões et al. (2014) recently described the synlophe and provided some morphometrical data for the species. Our specimens were identified as S. aculeata sensu Simões et al. (2014) because the main diagnostic characters (mainly those of the caudal bursa) corresponded to those described by Simões et al. (2014), rather than to those described by Travassos (1918, 1921). Stilestrongylus aculeata was reported from Akodon cursor in Suruí-Magé (Gomes et al. 2003) and later from A. montensis and O. nigripes in Serra dos Órgãos (Simões et al. 2011), Rio de Janeiro, Brazil. This is the first record of this species in Argentina, and so extends its geographical range., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 252, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Travassos, L. (1918) Trichostrongylidae Brasileiras. Revista de Sociedade Brasileira de Sciencias, 3, 191 - 205.","Travassos, L. (1921) Contribucioes para o conhecimento da fauna helmintolojica brasileira. Ensaio monografico da familia Trichostrongylidae Leiper, 1909. Memorias do Instituto Oswaldo Cruz, 13, 5 - 125.","Travassos, L. & Darriba, A. (1929) Notas sobre Heligmosominae. Scientia Medica, 7, 432 - 438.","Gomes, D. C., Pereira, R., Vicente, J. J. & Pinto, R. M. (2003) Nematode parasites of marsupials and small rodents from the Brazilian Atlantic Forest in the State of Rio de Janeiro, Brazil. Revista Brasileira de Zoologia, 20, 699 - 707. https: // doi. org / 10.1590 / s 0101 - 81752003000400024","Simoes, R. O., Souza, J. G. R., Maldonado, Jr. A. & Luque, J. L. (2011) Variation in the helminth community structure of three sympatric sigmodontine rodents from the coastal Atlantic Forest of Rio de Janeiro, Brazil. Journal of Helminthology, 85, 171 - 178. https: // doi. org / 10.1017 / s 0022149 x 10000398"]}

Hassalstrongylus epsilon (Travassos 1937) Site of infection. small intestine Collection number. MLP-He7344, MLP-He7349 Host species. Nectomys squamipes. CG44. Oligoryzomys nigripes. CG190 Localities. RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description and subsequent redescriptions given by Travassos (1937) and Durette-Desset (1969), i.e. subsymmetrical caudal bursa with poorly developed dorsal lobe, very short spicules, and synlophe with 22 slightly unequal ridges. This species was formerly described by Travassos (1937) as Longistriata epsilon. Durette-Desset (1969) later emended the description of the species based on the type of specimens housed in the Helminthological Collection of the Instituto Oswaldo Cruz and assigned Nectomys squamipes as the type host. Then Durette-Desset (1971) proposed the combination Hassalstrongylus epsilon. Subsequent reports of the species in Brazil include those of Pinto et al. (1982) in N. squamipes from the Goiás State, and Gomes et al. (2003) in N. squamipes and in A. cursor from Rio de Janeiro State. This is the first record of this species in O.nigripes and from Argentina., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on pages 251-252, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Travassos, L. (1937) Contribucao ao conhecimiento da Phylogynia dos Oxyuridae (Nematoda). Memorias do Instituto Oswaldo Cruz, 32, 607 - 613. https: // doi. org / 10.1590 / s 0074 - 02761937000400009","Durette-Desset, M. C. (1969) Nematodes heligmosomes d'Amerique du Sud. IV. Description de Longistriata hoineffae sp. nov. parasite de Cricetides, et etude du systeme des aretes cuticulares de L. epsilon Travassos, 1937, et L. dollfusi Diaz-Ungria, 1963. Bulletin du Museum National D'Histoire Naturelle, 2 eme Serie, 41, 328 - 337.","Pinto, R. M., Kohn, A., Fernandes, B. M. M. & Mello, D. A. (1982) Nematodes of rodents in Brazil with description of Aspidodera vicentei n. sp. Systematic Parasitology, 4, 263 - 267. https: // doi. org / 10.1007 / BF 00009627","Gomes, D. C., Pereira, R., Vicente, J. J. & Pinto, R. M. (2003) Nematode parasites of marsupials and small rodents from the Brazilian Atlantic Forest in the State of Rio de Janeiro, Brazil. Revista Brasileira de Zoologia, 20, 699 - 707. https: // doi. org / 10.1590 / s 0101 - 81752003000400024"]}

Trichuris navonae Robles, 2011 Site of infection. caecum Collection number. MLP-He7326, MLP-He7333 Host species. Akodon montensis. CG145. Thaptomys nigrita. CG355 Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Robles (2011), i.e. males without spicular tube, proximal cloacal tube united laterally to distal cloacal tube, cylindrical and spiny spicular sheath, and females with non-protrusive vulva, among other morphometric features. This species was described for A. montensis and T. nigrita from different localities of Misiones province: Balneario Municipal de Aristóbulo del Valle of stream Cuña Pirú, Club Pesca Paranay-Guazú, mouth stream Paranay-Guazú, Stream Salamanca, Salto El Paraíso, Stream Paraíso, Stream Oveja Negra, Parque Provincial Cruce Caballero, Parque Provincial Moconá, Puerto Península (Robles 2011; Robles & Navone 2014)., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on pages 248-249, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Robles, M. del R. (2011) New species of Trichuris (Nematoda: Trichuridae) from Akodon montensis Thomas, 1913 of the Paranaense forest in Argentina. Journal of Parasitology, 97, 319 - 327. https: // doi. org / 10.1645 / ge- 2434.1","Robles, M. del R. & Navone, G. T. (2014) New host records and geographic distribution of species of Trichuris (Nematoda: Trichuriidae) in rodents from Argentina with an updated summary of records from America. Mastozoologia Neotropical, 21, 67 - 78."]}

Tapironema coronatum Durette-Desset, Chabaud & Sutton, 1997 Site of infection. stomach Collection number. MLP-He7328, MLP-He7338, MLP-He7348, MLP-He7355 Host species. Akodon montensis. CG169. Euryoryzomys russatus. CG563. Oligoryzomys nigripes. CG510. Sooretamys angouya. CG46. Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Durette-Desset et al. (1997), i.e. presence of a corona radiata and esophageal tooth, synlophe with numerous longitudinal ridges transversally elongated, caudal bursa with rays 5 and 6 apposed in males and didelphic in females. Tapironema coronatum was described parasitizing Holochilus brasiliensis (Desmarest, 1819) (Rodentia: Sigmodontinae) in Buenos Aires province, Argentina, and parasitizing Tapirus terrestris (Linneaus, 1758) (Perissodactyla: Tapiridae) in French Guiana. This finding enlarges the host records and adds new localities for Argentina., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 250, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Durette-Desset, M. C., Chabaud, A. G. & Sutton, C. A. (1997) Tapironema coronatum n. gen., n. sp. (Trichostrongyloidea, Cooperiinae, Obeliscoidinae), a parasite of Holochilus brasiliensis and Tapirus terrestris. Parasite, 4, 227 - 232. https: // doi. org / 10.1051 / parasite / 1997043227"]}

Guerrerostrongylus ulysi Digiani, Notarnicola & Navone, 2012 Site of infection. small intestine Collection number. MLP-He7339, MLP-He7356 Host species. Euryoryzomys russatus. CG563. Sooretamys angouya. CG201 Localities. RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Digiani et al. (2012), i.e. synlophe with numerous (ca. 40) subequal ridges, heart-shaped caudal bursa with hypertrophied dorsal ray and longer than rays 6, rays 6 shorter than rays 8, straight and weakly sclerotized spicules and 6.4–9.5% mean the proportion (in percentage) of spicule length on body length (SpL/BL). Digiani et al. (2012) gathered material of S. angouya from four localities: Reserva Privada de Vida Silvestre Urugua-í, Depto. General Manuel Belgrano; Puerto Península, Parque Nacional Iguazú, Depto. Iguazú; Refugio Moconá, A ° Oveja Negra and Ruta 2, Reserva de la Biósfera Yabotí, Depto. Guaraní and Reserva de Usos Múltiples Guaraní, Municipio El Soberbio, Depto. Guaraní, Misiones province, Argentina. This is the first record of G. ulysi for E. russatus, enlarging the geographical and host range of the species., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 251, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Digiani, M. C., Notarnicola, J. & Navone, G. T. (2012) The genus Guerrerostrongylus (Nematoda, Heligmonellidae) in cricetid rodents from the Atlantic Rain Forest of Misiones, Argentina: emended description of Guerrerostrongylus zetta (Travassos, 1937) and description of a new species. Journal of Parasitology, 98, 985 - 991. https: // doi. org / 10.1645 / ge- 3075.1"]}

Trichofreitasia lenti Sutton & Durette-Desset 1991 Site of infection. small intestine, common bile duct Collection number. MLP-He7329 Host species. Akodon montensis. CG145 Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description and subsequent redescriptions given by Sutton & Durette-Desset (1991) and Suriano & Navone (1992), i.e. relatively large body (7–13 mm.), synlophe with 22 ridges stout and oriented perpendicularly to body surface, subsymmetrical caudal bursa with lateral pattern of type 2-2-1, well-developed dorsal lobe with dorsal ray distally divided and short spicules (230-310) in relation to body length. Trichofreitasia lenti was originally described by Sutton & Durette-Desset (1991) in Oligoryzomys flavescens (Waterhouse, 1837) from Buenos Aires province, Argentina. Shortly after, Suriano & Navone (1992) described Hassalstrongylus multiovatus in Akodon simulator (Thomas, 1916) from Tucuman province, Argentina. Later, Digiani et al. (2007) synonymized it with T. lenti. This species was also recorded for A. montensis, A. cursor and O. nigripes from Serra dos Órgãos, Rio de Janeiro, Brazil (Simões et al. 2011). This is the first record of this species in Misiones province, Argentina., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 252, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Sutton, C. A. & Durette-Desset, M. C. (1991) Nippostrongylinae (Nematoda-Trichostrongyloidea) parasites d´Oryzomys flavescens en Argentine et en Uruguay. Revue Suisse de Zoologie, 98, 535 - 553. https: // doi. org / 10.5962 / bhl. part. 82072","Suriano, D. M. & Navone, G. T. (1992) Stilestrongylus freitasi Durette Desset, 1969 and Hassalstrongylus multiovatus n. sp. (Nematoda-Nippostrongylinae) from Akodon simulator (Cricetidae) in Tucuman, Argentina. Research and Reviews in Parasitology, 53, 51 - 55.","Digiani, M. C. & Durette-Desset, M. C. (2007) Trichostrongylina (Nematoda) parasitic in Phyllotis sp. (Rodentia: Sigmodontinae) from Argentina, with description of three new species. Parasitology International, 56, 9 - 18. https: // doi. org / 10.1016 / j. parint. 2006.10.001","Simoes, R. O., Souza, J. G. R., Maldonado, Jr. A. & Luque, J. L. (2011) Variation in the helminth community structure of three sympatric sigmodontine rodents from the coastal Atlantic Forest of Rio de Janeiro, Brazil. Journal of Helminthology, 85, 171 - 178. https: // doi. org / 10.1017 / s 0022149 x 10000398"]}

Trichuris sp. Site of infection. caecum. Collection number. MLP-He7337 Host species. Euryoryzomys russatus. CG563 Locality. PPU Comments. The morphological characters observed in the two female specimens collected agree with the description of the genus Trichuris, i.e. anterior part of body being long, narrow, tapered and whip-like; posterior part of body being broad and handlelike with bacillary band located in anterior portion of body (e.g. Robles, 2011). These specimens show a nonprotrusive vulva, oval and flat eggs with bipolar plugs. More material should be collected to identify them at species level. This is the first record of the genus Trichuris in E. russatus., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 249, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Robles, M. del R. (2011) New species of Trichuris (Nematoda: Trichuridae) from Akodon montensis Thomas, 1913 of the Paranaense forest in Argentina. Journal of Parasitology, 97, 319 - 327. https: // doi. org / 10.1645 / ge- 2434.1"]}

Stilestrongylus lanfrediae Souza, Digiani, Simões, Luque, Rodrigues-Silva & Maldonado, 2009 Site of infection. small intestine Collection number. MLP-He7340, MLP-He7351, MLP-He7357 Host species. Euryoryzomys russatus. CG563. Oligoryzomys nigripes. CG190. Sooretamys angouya. CG201 Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Souza et al. (2009), i.e. synlophe with 25–26 subequal ridges, bell-shaped and asymmetrical caudal bursa with strong asymmetry of rays 8 and of branches of dorsal ray, very long and striated spicules, and SpL/BL of 25–29%. Stilestrongylus lanfrediae was described by Souza et al. (2009) in O. nigripes from Serra dos Órgãos, Teresópolis, Rio de Janeiro, Brazil. It was also recorded by Simões et al. (2011) extending the range of the hosts to A. cursor and A. montensis. This is the first record of this species in Argentina, and E. russatus and S. angouya are new host records., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on pages 252-253, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Souza, J. G. R., Digiani, M. C., Simoes, R. O., Luque, J. L., Rodrigues-Silva, R. & Maldonado, Jr. A. (2009 a) A new heligmonellid species (Nematoda) from Oligoryzomys nigripes (Rodentia: Sigmodontinae) in the Atlantic Forest, Brazil. Journal of Parasitology, 95, 734 - 738. https: // doi. org / 10.1645 / ge- 1836.1","Simoes, R. O., Souza, J. G. R., Maldonado, Jr. A. & Luque, J. L. (2011) Variation in the helminth community structure of three sympatric sigmodontine rodents from the coastal Atlantic Forest of Rio de Janeiro, Brazil. Journal of Helminthology, 85, 171 - 178. https: // doi. org / 10.1017 / s 0022149 x 10000398"]}

Syphacia evaginata Hugot & Quentin 1985 Site of infection. caecum Collection number. MLP-He7343 Host species. Euryoryzomys russatus. CG553 Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Hugot & Quentin (1985), i.e. prominent (everted) vulva and deirids present in females, equidistant mamelons, accessory hook of gubernaculum with ornamentation relatively short tail in males, among other morphometric features. This species was described for Oryzomys sp. from Belem, Brasil (Hugot & Quentin 1985). This is the first record for E. russatus and from Argentina., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 255, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Hugot, J. P. & Quentin, J. C. (1985) Etude morphologique de six especes nouvelles ou peu connues appartenant au genre Syphacia (Oxyuridae, Nematoda), parasites de Rongeurs Cricetides et Murides. Bulletin du Museum National D'Histoire Naturelle, 4, 383 - 400."]}

Syphacia alata Quentin 19 68 Site of infection. caecum Collection number. MLP-He7336 Host species. Thaptomys nigrita. CG355 Localities. CAMB, RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Quentin (1968), i.e. absence of deirids in both sexes, well-developed cervical alae in females, equidistant mamelons, accessory hook of gubernaculum with ornamentation on whole surface, relatively long tail in males, among other morphometric features. This species was originally described by Quentin (1968) for N. lasiurus and recorded for O. nigripes and Sigmodontomys alfari (Allen 1897) (Quentin 1968, 1969) from Pernambuco, Brazil. In Argentina, Robles (2010) mentions this species parasitizing T. nigrita from Balneario Municipal de Aristóbulo del Valle in the stream Cuña Pirú and Caraguatay, Misiones province, and N. lasiurus from Finca La Adelita, Laguna Paiva, Corrientes province; Colonia Villafañe, Formosa province; Estación Experimental del INTA Villa Miguel Lanús, Misiones province; Oliveros, Uranga and Maciel in Santa Fe province; and Pergamino and Rojas in Buenos Aires province., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 254, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Quentin, J. C. (1968) Description de Syphacia (Syphacia) alata n. sp., oxyure parasite du rongeur cricetidae Zygodontomys lasiurus (Lund, 1839). Bulletin du Museum National D'Histoire Naturelle, 2, 807 - 813.","Quentin, J. C. (1969) Etude de nematodes Syphacia parasites de Rongeurs Cricetidae sudamericains et de leurs correlations biogeographiques avec certaines especes neartiques. Bulletin du Museum National D'Histoire Naturelle, 2, 909 - 925."]}

Trichuris bainae Robles, Cutillas, Panei & Callejón, 2014 Site of infection. caecum Collection number. MLP-He7354 Host species. Sooretamys angouya. CG185 Localities. RVSU and PPU Comments. The morphological characters observed in the specimens agree with the original description given by Robles et al. (2014), i.e. males without spicular tube, proximal cloacal tube united laterally to distal cloacal tube, cylindrical and spiny spicular sheath, and females with protrusive and ornamented vulva, among other morphometric features. This species was described for the same host from Refugio Moconá Reserva de Usos Múltiples Guaraní, Misiones province and Estación de Animales Silvestres Guaycolec, Formosa province, Argentina., Published as part of Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, pp. 243-262 in Zootaxa 4337 (2) on page 248, DOI: 10.11646/zootaxa.4337.2.4, http://zenodo.org/record/1018756, {"references":["Robles, M. del R. & Navone, G. T. (2014) New host records and geographic distribution of species of Trichuris (Nematoda: Trichuriidae) in rodents from Argentina with an updated summary of records from America. Mastozoologia Neotropical, 21, 67 - 78."]}

We comment on the geographical distribution of the 3 recognized species of Bibimys, focusing in the type species, B. torresi. By briefly reviewing the fossil occurrence of this form we posit that the species suffered a very recent marked retraction. Based on few collected individuals belonging to B. chacoensis and B. torresi, we describe some external traits, such as their unique mammary dotation composed by 2 pairs located more caudally, 1 of them laterally to the genitalia. Combining morphology with direct observation of a wild individual we advance that Bibimys is not a fossorial or semi-fossorial form but a specialized sigmodontine focused on the active search for food employing mostly the nose. Comentamos sobre la distribución geográfica de las 3 especies reconocidas de Bibimys, con énfasis en la especie tipo, B. torresi. Revisando brevemente su registro fósil postulamos que dicha especie sufrió una marcada retracción reciente. Sobre la base de unos pocos individuos colectados pertenecientes a B. chacoensis y B. torresi, describimos algunos rasgos externos como la dotación mamaria compuesta por 2 pares localizados más atrás en el cuerpo, 1 de ellos lateralmente a la genitalia. Combinando morfología con observaciones directas de un individuo en libertad postulamos que Bibimys no es una forma fosorial o semifosorial sino un sigmodontino especializado en la búsqueda activa de alimento empleando mayormente la nariz. Fil: Pardiñas, Ulises Francisco J.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Diversidad y Evolución Austral; Argentina Fil: Voglino, Damián. Museo de Ciencias Naturales Antonio Scasso; Argentina Fil: Galliari, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina

We comment on the geographical distribution of the 3 recognized species of Bibimys, focusing in the type species, B. torresi. By briefly reviewing the fossil occurrence of this form we posit that the species suffered a very recent marked retraction. Based on few collected individuals belonging to B. chacoensis and B. torresi, we describe some external traits, such as their unique mammary dotation composed by 2 pairs located more caudally, 1 of them laterally to the genitalia. Combining morphology with direct observation of a wild individual we advance that Bibimys is not a fossorial or semi-fossorial form but a specialized sigmodontine focused on the active search for food employing mostly the nose., Comentamos sobre la distribución geográfica de las 3 especies reconocidas de Bibimys, con énfasis en la especie tipo, B. torresi. Revisando brevemente su registro fósil postulamos que dicha especie sufrió una marcada retracción reciente. Sobre la base de unos pocos individuos colectados pertenecientes a B. chacoensis y B. torresi, describimos algunos rasgos externos como la dotación mamaria compuesta por 2 pares localizados más atrás en el cuerpo, 1 de ellos lateralmente a la genitalia. Combinando morfología con observaciones directas de un individuo en libertad postulamos que Bibimys no es una forma fosorial o semifosorial sino un sigmodontino especializado en la búsqueda activa de alimento empleando mayormente la nariz., Centro de Estudios Parasitológicos y de Vectores

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 Vectores