Voyages dans l’Amérique méridionale, 1781-1801

Diversity and Distribution of the Mouse Opossums of the Genus Thylamys (Didelphimorphia, Didelphidae) in Northeastern and Central Argentina

“…The genus Thylamys Gray 1843 comprises small mouse opossums with some distinctive traits, including a characteristic tricolor fur pattern, capacity to store fat in the tail, uniformly narrow nasals with subparallel lateral margins, large between M4 protocones, and other morphological characters in body proportions, skull, dentition, and American mouse opossums, which are found in tropical or subtropical moist forests, Thylamys principally inhabits semi-arid and open areas and occurs at temperate latitudes (Flores et al 2007, Thylamys since Tate (1933) recognized the elegans species group as part of the genus Marmosa systematic works, based on morphological, the distinctiveness of Thylamys within the didelphid radiation (Reig et al 1989, Palma et al of the genus, and elucidated some basic questions regarding relationships among its species and their et al 2000, Meynard et al 2002, Palma et al 2002 As currently recognized, Thylamys comprises at with modifications according to Braun et al diverse marsupial genus, and one of the groups northern Argentina: T. pallidior, in arid highlands T venustus in montane humid T. pusillus in the Thylamys pusillus has restricted the name pusillus to populations in pusillus to include forms from the Andean highlands and southern steppes previously assigned to pallidior et al 2005apallidior et al , Flores et al 2008) restrict the name pusillus to the central and northeastern populations from Argentina, western T. pusillus includes, as subjective junior synonyms, Marmosa citella Marmosa janetta pulchella Marmosa verax the biological and geographic limits of T. pusillus fact, the name pusillus was proposed on the basis of (Azara, 1801(Azara, , 1802, without the formal designation et al (in press) designed a neotype for pusillus from Trans-Chaco authors suggest that some Argentinean populations of pusillus-like Thylamys may represent a different species than the nominotypical form that occurs hand, Argentinean populations from Entre Ríos and Corrientes provinces (Mesopotamia), usually synonymyzed in the literature with pusillus, have alternatively included in Marmosa marmota, Thylamys pusillus, or considered a separated species under the name of M. citella Argentinean populations of Thylamys that are currently included within T. pusillus goal of this study is to clarify how many species provide emended diagnosis, re-descriptions, and comparisons for the species recognized in a new MATERIALS AND METHODS STUDY SPECIMENS. A total of 86 specimens from systematic collections, or were obtained by us either by trapping or from owl pellet analysis and guidelines approved by the American Society of Mammalogists were followed (Gannon et al et al 1996), each with 33 % of data deletion and three replicates of random Bayesian analysis was conducted with MrBayes 3 independent runs with three heated and one cold of base substitution, a gamma-distributed rate parameter, and a proportion of invariant sites was GTR parameters, which assumed a Dirichlet converged on a stable log-likelihood value, we plotted the log-likelihood values against generation discarded as burn-in and the remaining trees were used to compute a 50% majority rule consensus tree and obtain posterior probability (PP) estimates for…”

Precios, Producto Agrario Y Niveles De Vida en Las Fronteras Rioplatenses, 1700-1810: Una Nueva Mirada Sobre El Crecimiento Económico Tardocolonial

“… 11 El historiador Vicuña Mackenna calculaba 400 vecinos o 2.000 habitantes para 1755, dato tomado de Cervera (1907, p. 671). Maeder (1976) informa 1.500 habitantes para la ciudad y 6.356 para toda la jurisdicción en 1760; y Azara (1809, t. II, pp. 338-339) indica 4.000 sólo para la ciudad, aunque esta cifra pudo incluir las áreas circundantes. …”