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Ulyses F. J. Pardiñas - One of the best experts on this subject based on the ideXlab platform.
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a new fossil cricetid rodentia Sigmodontinae from northeastern brazil with remarks on small mammal extinctions in the tropical quaternary
Journal of Mammalogy, 2020Co-Authors: Ulyses F. J. Pardiñas, Simone Baes Das Neves, Patricia Hadler, Elver Luiz Mayer, Ana Maria RibeiroAbstract:The rare cricetid rodent Bibimys Massoia, 1980 contains three extant species that are distributed in the lowlands of eastern South America between 35°S and 20°S and distinguished mostly by subtle morphological and genetic features. Several fragmented jaws belonging to this genus were recovered from Late Quaternary deposits located in northeastern Brazil, forming part of a rich archaeological and paleontological small mammal assemblage that has been recovered from caves in the Serra da Capivara, state of Piaui. This material is described herein as belonging to a new species, the most hypsodont member of the genus. The specimens also represent an extralimital occurrence of this sigmodontine, as the nearest extant population of Bibimys is ∼1,200 km to the south. Because there are few reliable records of extinct small mammals from the Pleistocene–Holocene transition on the South American continent, in describing this new sigmodontine we extend the records of past biodiversity preserved in the Quaternary deposits of tropical South America. This new species likewise highlights that the Serra da Capivara deposits are promising for understanding the evolutionary history of cricetid rodents.
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Tribal allocation and biogeographical significance of one of the largest sigmodontine rodent, the extinct Galápagos Megaoryzomys (Cricetidae)
Historical Biology, 2020Co-Authors: Christophe Ronez, Jorge Brito, Rainer Hutterer, Robert A. Martin, Ulyses F. J. PardiñasAbstract:One of the largest members of Sigmodontinae, the extinct Megaoryzomys curioi from Santa Cruz Island in the Galapagos Archipelago (Ecuador), is traditionally treated as a representative of Thomasomy...
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The availability, authorships and dates of tribal names in the Sigmodontinae (Rodentia, Cricetidae) current classification
Bionomina, 2019Co-Authors: Néstor J. Cazzaniga, Carola Cañón, Ulyses F. J. PardiñasAbstract:Sigmodontinae, a diverse subfamily including 106 genera of American Rodents, is currently divided in eleven tribes that still need to be refined based on recently generated phylogenetic hypotheses. Several published names of tribes do not conform to one or more Rules of the International Code of Zoological Nomenclature. In particular, the first arrangement of Sigmodontinae genera in tribes has been overlooked, the different requirements for availability of names proposed before 1931 and after 1930 were not taken into account for at least five names, the requirement that a family-group name be used as valid in the publication where proposed, and the unavailability of names proposed conditionally after 1960 were also ignored on several occasions. Our analysis tries to disclose and fix such nomenclatural problems keeping current usage as much as possible. A new name is proposed for a tribe that currently has been designated only by an unavailable name.
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A new genus of Sigmodontinae (Mammalia, Rodentia, Cricetidae) from the Pliocene of central Argentina
Journal of Vertebrate Paleontology, 2016Co-Authors: Franck Barbière, Laura Edith Cruz, Pablo E. Ortiz, Ulyses F. J. PardiñasAbstract:ABSTRACTChukimys favaloroi, new genus and species, is added to the past diversity of sigmodontine rodents, the largest subfamily of Neotropical mammals. It is based on a maxillary with the entire tooth row and both first and second lower molars collected in sediments of the Brochero Formation (Late Pliocene) that crop out in Cordoba Province, Argentina. The new genus represents a small rodent (about 40 g) and has a unique combination of traits, including a zygomatic plate with deeply excavated anterior border and conspicuous zygomatic spine, incisive foramen reaching the level of the protocone of the first upper molar, palate narrow and flat, molars moderately hypsodont, and the first lower molar four-rooted. The new sigmodontine shows similarities with several extant members of the tribes Phyllotini and Reithrodontini, as well as with the extinct Dankomys vorohuensis from the Pliocene of Buenos Aires, Argentina. The comparisons performed suggest that Chukimys has anatomical features related to omnivory a...
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The phylogenetic position of the enigmatic Atlantic forest-endemic spiny mouse Abrawayaomys (Rodentia: Sigmodontinae)
Zoological Studies, 2013Co-Authors: Karen Ventura, Yatiyo Yonenaga-yassuda, Ulyses F. J. Pardiñas, Maria José J Silva, Lena Geise, Yuri Lr Leite, Guillermo D'elíaAbstract:Background The phylogenetic position of the sigmodontine genus Abrawayaomys , historically assigned to the tribe Thomasomyini or considered a sigmodontine incertae sedis, was assessed on the basis of nuclear and mitochondrial DNA sequences obtained from four individuals from different localities in the Atlantic forest of Brazil. Sequences of Abrawayaomys were analyzed in the context of broad taxonomic matrices by means of maximum-likelihood (ML) and Bayesian analyses (BA). Results The phylogenetic position of Abrawayaomys differed depending on the gene analyzed and the analysis performed (interphotoreceptor retinoid-binding protein (IRBP) ML: sister to Thomasomyini; IRBP BA: sister to Akodontini; cytochrome (Cyt) b ML: sister to Neotomys ; and Cyt b BA: sister to Reithrodontini). With the sole exception of the BA based on Cyt b sequences, where the Abrawayaomys - Reithrodon clade had strong support, all sister-group relationships involving Abrawayaomys lacked any significant support. Conclusions As such, Abrawayaomys constitutes the only representative so far known of one of the main lineages of the sigmodontine radiation, differing from all other Atlantic forest sigmodontine rodents by having a unique combination of morphological character states. Therefore, in formal classifications, it should be regarded as a Sigmodontinae incertae sedis.
Rocio Callejon - One of the best experts on this subject based on the ideXlab platform.
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Morphological-molecular characterization and phylogenetic relationships of a new Trichuris species (Nematoda: Trichuridae) parasitic on Holochilus chacarius (Cricetidae: Sigmodontinae) from the Chaco ecoregion (Argentina)
Infection genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases, 2017Co-Authors: María Del Rosario Robles, Cristina Cutillas, Rocio CallejonAbstract:A new Trichuris species isolated from Holochilus chacarius (Cricetidae: Sigmodontinae) from the Chaco ecoregion in Argentina is described based on morphological characteristics and mitochondrial (cox1, cob) and nuclear (ITS2) markers. The new species is distinguished from 27 species of Trichuris from North and South American rodents based on morphological and biometrical features, such as the absence of a spicular tube, presence of a cylindrical spicular sheath, non-protrusive vulva, length of spicule, and proximal and distal cloacal tube. In addition, the results based on three molecular markers of the new species and three Trichuris species previously analysed from sigmodontine rodents: Trichuris pardinasi, Trichuris navonae and Trichuris bainae confirmed that the specimens here studied belong to a different species. Molecular data are further used to discuss the phylogenetic relationships among the Trichuris species of rodents from Argentina. The combined analysis of mitochondrial genes (cox1 and cob) revealed four clades corresponding with four different species of Trichuris. T. navonae (Akodontini rodents) and T. massoiai n. sp. as a sister group related to T. bainae (Oryzomyini rodents) and separated of T. pardinasi (Phyllotini rodents).
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Morphological and molecular characterization of a new Trichuris species (Nematoda- Trichuridae), and phylogenetic relationships of Trichuris species of Cricetid rodents from Argentina.
PLOS ONE, 2014Co-Authors: María Del Rosario Robles, Cristina Cutillas, Carlos Javier Panei, Rocio CallejonAbstract: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.
Andre V Bochkov - One of the best experts on this subject based on the ideXlab platform.
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new species of the subgenus radfordia hesperomyobia acariformes myobiidae parasites of the subfamily Sigmodontinae rodentia cricetidae Sigmodontinae
International Journal of Acarology, 2014Co-Authors: Andre V Bochkov, Mauricio BarretoAbstract:Two new species of myobiid mites belonging to the subgenus Radfordia (Hesperomyobia) (Acariformes: Myobiidae) are described from South American rodents of the subfamily Sigmodontinae (Rodentia: Cricetidae): Radfordia rhipidomys sp. nov. from Rhipidomys mastacalis (Lund, 1840) from Brazil and Radfordia burbanoae sp. nov. from Oryzomys alfaroi (Allen, 1891) from Colombia. A key to females of this subgenus is provided. urn:lsid:zoobank.org:pub:BBF00E6F-C90D-4D7D-9AD3-7FE5CA6B41B4
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New species of the subgenus Radfordia (Hesperomyobia) (Acariformes: Myobiidae) – parasites of the subfamily Sigmodontinae (Rodentia: Cricetidae: Sigmodontinae)
International Journal of Acarology, 2014Co-Authors: Andre V Bochkov, Mauricio BarretoAbstract:Two new species of myobiid mites belonging to the subgenus Radfordia (Hesperomyobia) (Acariformes: Myobiidae) are described from South American rodents of the subfamily Sigmodontinae (Rodentia: Cricetidae): Radfordia rhipidomys sp. nov. from Rhipidomys mastacalis (Lund, 1840) from Brazil and Radfordia burbanoae sp. nov. from Oryzomys alfaroi (Allen, 1891) from Colombia. A key to females of this subgenus is provided. urn:lsid:zoobank.org:pub:BBF00E6F-C90D-4D7D-9AD3-7FE5CA6B41B4
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fur mites of the family listrophoridae acariformes sarcoptoidea associated with south american sigmodontine rodents cricetidae Sigmodontinae
Acta Parasitologica, 2012Co-Authors: Bozena Sikora, Andre V BochkovAbstract:Six species of 3 genera belonging to the fur mite family Listrophoridae were recorded on skins of South American rodents of the cricetid subfamily Sigmodontinae housed in the Bavarian State Collection of Zoology (Munich, Germany). Among them, Amlistrophorus geoxus sp. nov. from Geoxus valdivianus from Chile is described as a new for science, and males of Prolistrophorus amazonicus amazonicus Fain, 1971 are recorded for the first time. The full generic status for the subgenus Amlistrophorus of the genus Prolistrophorus proposed by Fain et al. (1996) is not supported, and Prolistrophorus musculinus Fain, 1973 stat. nov. (formerly a subspecies of P. amazonicus) from Mus musculus (Rodentia: Muridae) from Suriname is raised to species status. New hosts are recorded for the following species: Prolistrophorus argentinus (Hirst, 1921) from Holochilus brasiliensis and H. chacarius from Argentina, P. amazonicus from Calomys callosus from Argentina and Bolivia, C. laucha and C. musculinus from Argentina, P. akodon Fain and Lukoschus, 1982 from Akodon montensis from Argentina, P. nectomys Fain, 1971 from Nectomys palmipes from Peru and Melanomys caliginosus from Panama, and Sclerolistrophorus oxymycteris Fain, 1976 from Oryzomys laticeps from Brazil.
María Celina Digiani - One of the best experts on this subject based on the ideXlab platform.
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A new species of Stilestrongylus (Nematoda, Heligmonellidae) from the Atlantic Forest of Misiones, Argentina, parasitic in Euryoryzomys russatus (Cricetidae, Sigmodontinae).
Parasitology research, 2018Co-Authors: Guillermo Panisse, María Celina DigianiAbstract: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-i and Parque Provincial Urugua-i, 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.
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A new genus and species of Heligmonellidae (Nematoda: Trichostrongylina) parasitic in Delomys dorsalis (Rodentia: Sigmodontinae) from Misiones, Argentina.
Folia parasitologica, 2014Co-Authors: María Celina Digiani, John M. KinsellaAbstract:Alippistrongylus bicaudatus gen. et sp. n. (Nematoda: Heligmonellidae) is described from the striped Atlantic forest rat, Delomys dorsalis (Hensel) (Rodentia: Sigmodontinae), from the province of Misiones in Argentina. The new genus and species is characterised by a synlophe of 21 unequal ridges in both sexes without a gradient in size, with two ridges weakly sclerotised and oriented perpendicularly in the dorsal left quadrant; males with a highly dissymmetrical bursa with a hypertrophied right lobe, and females with a dorsal conical appendage just posterior to the vulva, conferring a two-tailed appearance to the female worms.
Guillermo D'elía - One of the best experts on this subject based on the ideXlab platform.
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Ultraconserved Elements Improve the Resolution of Difficult Nodes within the Rapid Radiation of Neotropical Sigmodontine Rodents (Cricetidae: Sigmodontinae).
Systematic biology, 2021Co-Authors: Andrés Parada, John Hanson, Guillermo D'elíaAbstract:Sigmodontine rodents (Cricetidae, Sigmodontinae) represent the second largest muroid subfamily and the most species-rich group of New World mammals, encompassing above 410 living species and ca. 87 genera. Even with advances on the clarification of sigmodontine phylogenetic relationships that have been made recently, the phylogenetic relationships among the 12 main group of genera (i.e., tribes) remain poorly resolved, in particular among those forming the large clade Oryzomyalia. This pattern has been interpreted as consequence of a rapid radiation upon the group entrance into South America. Here, we attempted to resolve phylogenetic relationships within Sigmodontinae using target capture and high-throughput sequencing of ultraconserved elements (UCEs). We enriched and sequenced UCEs for 56 individuals and collected data from four already available genomes. Analyses of distinct data sets, based on the capture of 4,634 loci, resulted in a highly resolved phylogeny consistent across different methods. Coalescent species-tree based approaches, concatenated matrices, and Bayesian analyses recovered similar topologies that were congruent at the resolution of difficult nodes. We recovered good support for the intertribal relationships within Oryzomyalia; for instance, the tribe Oryzomyini appears as the sister taxa of the remaining oryzomyalid tribes. The estimates of divergence times agree with results of previous studies. We inferred the crown age of the sigmodontine rodents at the end of Middle Miocene, while the main lineages of Oryzomyalia appear to have radiated in a short interval during the Late Miocene. Thus, the collection of a genomic scale data set with a wide taxonomic sampling, provided resolution for the first time of the relationships among the main lineages of Sigmodontinae. We expect the phylogeny presented here will become the backbone for future systematic and evolutionary studies of the group.
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The phylogenetic position of the enigmatic Atlantic forest-endemic spiny mouse Abrawayaomys (Rodentia: Sigmodontinae)
Zoological Studies, 2013Co-Authors: Karen Ventura, Yatiyo Yonenaga-yassuda, Ulyses F. J. Pardiñas, Maria José J Silva, Lena Geise, Yuri Lr Leite, Guillermo D'elíaAbstract:Background The phylogenetic position of the sigmodontine genus Abrawayaomys , historically assigned to the tribe Thomasomyini or considered a sigmodontine incertae sedis, was assessed on the basis of nuclear and mitochondrial DNA sequences obtained from four individuals from different localities in the Atlantic forest of Brazil. Sequences of Abrawayaomys were analyzed in the context of broad taxonomic matrices by means of maximum-likelihood (ML) and Bayesian analyses (BA). Results The phylogenetic position of Abrawayaomys differed depending on the gene analyzed and the analysis performed (interphotoreceptor retinoid-binding protein (IRBP) ML: sister to Thomasomyini; IRBP BA: sister to Akodontini; cytochrome (Cyt) b ML: sister to Neotomys ; and Cyt b BA: sister to Reithrodontini). With the sole exception of the BA based on Cyt b sequences, where the Abrawayaomys - Reithrodon clade had strong support, all sister-group relationships involving Abrawayaomys lacked any significant support. Conclusions As such, Abrawayaomys constitutes the only representative so far known of one of the main lineages of the sigmodontine radiation, differing from all other Atlantic forest sigmodontine rodents by having a unique combination of morphological character states. Therefore, in formal classifications, it should be regarded as a Sigmodontinae incertae sedis.
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A new genus for the Andean mice Akodon latebricola and A. bogotensis (Rodentia: Sigmodontinae)
Journal of Mammalogy, 2013Co-Authors: Diego F. Alvarado-serrano, Guillermo D'elíaAbstract:Abstract Akodontini is the 2nd most diverse tribe of Sigmodontinae, which in turn is one of the most speciose groups of muroid rodents. This tribe is among the most poorly understood Neotropical taxa, with most taxonomic problems concentrated in Andean species, especially those inhabiting the northern Andes. Here, applying morphological, morphometric, and phylogenetic analyses (based on 1 mitochondrial and 1 nuclear gene), we review the systematic and taxonomic status of the Bogota akodont, Akodon bogotensis Thomas, 1895, and the Ecuadorean akodont, A. latebricola (Anthony, 1924) (Cricetidae: Sigmodontinae). Morphometric and morphological analyses give evidence of the morphological distinctiveness of A. latebricola and A. bogotensis. Specifically, these small-sized species present a unique combination of characters that includes soft, grizzled to dark chestnut dorsal fur; dark brown manus, pes, and tail; slender and proportionally long rostra; indistinct zygomatic notches; narrow, backward-sloping zygomat...
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A phylogenetic appraisal of Sigmodontinae (Rodentia, Cricetidae) with emphasis on phyllotine genera: systematics and biogeography
Zoologica Scripta, 2013Co-Authors: Jorge Salazar-bravo, Ulyses F. J. Pardiñas, Guillermo D'elíaAbstract:Here, we present a comprehensive phylogenetic analysis based on nuclear and mitochondrial DNA sequences of rodents of the subfamily Sigmodontinae. The emphasis is placed on the large tribe Phyllotini; sampling includes for the ! rst time in any molecular-based phylogenetic analysis representatives of several genera traditionally considered to be phyllotines. Given the broad taxonomic sampling, results provide substantial improvements in our knowledge on both the structure of the sigmodontine radiation and of phyllotine phylogenetic relationships. For instance, the tribe Ichthyomyini was not recovered monophyletic. Similarly, in a novel hypothesis on the contents of the tribe Phyllotini, it is shown that unlike Galenomys, the genera Chinchillula, Neotomys and Punomys are not phyllotines. The later genera together with Andinomys, Euneomys, Irenomys and Juliomys form part of novel generic clades of mostly Andean sigmodontine rodents. More in general, results strongly suggest the occurrence of several instances of putative morphological convergence among distinct sigmodontine lineages (e.g. among now considered to be ichthyomyines; between Phyllotini and some Andean taxa; among Euneomys-Neotomys and Reithrodon). Finally, we suggest that the historical biogeography of the sigmodontine rodents is far more complex than earlier envisioned.
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Dating an impressive Neotropical radiation: Molecular time estimates for the Sigmodontinae (Rodentia) provide insights into its historical biogeography.
Molecular phylogenetics and evolution, 2012Co-Authors: Andrés Parada, Guillermo D'elía, Ulyses F. J. Pardiñas, Jorge Salazar-bravo, R. Eduardo PalmaAbstract:Abstract With about 400 living species and 82 genera, rodents of the subfamily Sigmodontinae comprise one of the most diverse and more broadly distributed Neotropical mammalian clades. There has been much debate on the origin of the lineage or the lineages of sigmodontines that entered South America, the timing of entrance and different aspects of further diversification within South America. The ages of divergence of the main lineages and the crown age of the subfamily were estimated by using sequences of the interphotoreceptor retinoid binding protein and cytochrome b genes for a dense sigmodontine and muroid sampling. Bayesian inference using three fossil calibration points and a relaxed molecular clock estimated a middle Miocene origin for Sigmodontinae (∼12 Ma), with most tribes diversifying throughout the Late Miocene (6.9–9.4 Ma). These estimates together results of analyses of ancestral area reconstructions suggest a distribution for the most recent common ancestor of Sigmodontinae in Central-South America and a South American distribution for the most recent common ancestor of Oryzomyalia.
