Examinando por Materia "Didelphidae"
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Ítem Coalescent-delimitation framework and ecogeographic patterns disentangle the species boundaries within the Neotropical mouse-opossums subgenus Marmosops(Universidad EAFIT, 2022) Carillo Restrepo, Jhan Carlos; Díaz Nieto, Juan FernandoThe Neotropics encompasses a wide range of biomes and habitat types that place it as one of the most important Earth's regions for understanding the prevalence of cryptic and unknown diversity. However, it has been shown that this region is one of the least represented in genetic data in the tree of life. Therefore, advancing intra and interspecific genetic revisions in this region represents a major scientific priority to reduce our ignorance of the planet's biodiversity. American marsupials of Marmosops subgenus are distributed in a wide variety of Neotropical habitats, so it is an attractive group to undertake studies on Neotropical diversification processes, but such research is hindered by the fact that we do not yet fully understand the species limits of some groups within the subgenus. Herein, we evaluate the evolutionary independence of 13 morphologically-cryptic mtDNA haplogroups within Marmosops that were identified by our previous single-locus species delimitation analyses. For this purpose, we analyzed a multi-locus dataset (12 unlinked nuclear loci and one mtDNA locus) in a Bayesian Multi-Species Coalescent framework implemented in BPP, combined with heuristic criterion (gdi) that incorporated the speciation-continuum process into species delimitation analyses, to further understand the genetic boundaries within this Neotropical mouse opossum’s clade. Our BPP analyses recovered each of the 13 haplogroups as independent evolutionary lineages. However, heuristic gdi showed that the tested lineages are across the entire spectrum of the speciation continuum, and that only seven lineages recognized by BPP correspond to “true” species. Three of these seven lineages are currently recognized as valid species, demonstrating the effectiveness of our study; while ecogeographic patterns information revealed that the remaining four lineages have promising information to be recognized as possible new species for science.Ítem How integrative taxonomy can save a species from extinction: The supposedly extinct mouse opossum Cryptonanus ignitus (Diaz, Flores and Barquez, 2000) is a synonym of the living C. chacoensis (Tate, 1931)(Elsevier BV, 2019-01-01) Teta P.; Díaz-Nieto J.F.; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y ConservaciónWe reviewed the taxonomic status of the “extinct” mouse opossum Cryptonanus ignitus (Diaz, Flores and Barquez, 2000). This species is only known from the type, an adult male collected in the province of Jujuy, northwestern Argentina, in 1962. Based on both qualitative and quantitative external and cranial traits and the analysis of DNA sequences extracted from the 57-year-old type skin, we confirm the suggestion of previous researchers that C. ignitus is an elderly example of the living species C. chacoensis (Tate, 1931). Most of the supposedly diagnostic morphological traits of C. ignitus (e.g., zygomatic arches unusually wide and robust, postorbital process of the jugal massively developed, prominent temporal scars) are age-correlated in didelphids and were observed in other adult specimens of C. chacoensis. The clay coloration of the ventral pelage of C. ignitus, which allegedly sets apart this species from other congeners, is here reported for new examples of C. chacoensis from other localities. Our results suggest the need to carefully evaluate the taxonomic status of other species supposed to have become extinct in recent times in mainland South America. © 2019 Deutsche Gesellschaft für SäugetierkundeÍtem Phylogenetic relationships of Chacodelphys (Marsupialia: Didelphidae: Didelphinae) based on “ancient” DNA sequences(Oxford University Press, 2016-03-01) Díaz-Nieto, J.F.; Voss, Robert S; Jansa, Sharon A; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y ConservaciónMorphological character data are inadequate to resolve the evolutionary relationships of the didelphid genus Chacodelphys, which previous phylogenetic analyses have alternatively suggested might be the sister taxon of Lestodelphys and Thylamys