Pisces, Characiformes, Characidae, Glandulocaudinae, <i>Mimagoniates barberi</i> Regan, 1907: First Argentinean distribution record.

The current note reports the presence of Mimagoniates barberi at northeastern Argentina. This record representsthe southernmost limit for this species and the first country record of the genus

Anatomy and phylogenetic relationships of a new catfish species from northeastern Argentina with comments on the phylogenetic relationships of the genus Rhamdella Eigenmann and Eigenmann 1888 (Siluriformes, Heptapteridae)

Rhamdella cainguae, a new species of the family Heptapteridae is described from the Arroyo Cuña-Pirú, a tributary of the Río Paraná, in the subtropical forest of Misiones, northeastern Argentina. The presence of a large differentiated ovoid area on the supraorbital laterosensory canal along the frontal-sphenotic boundary, delimited by the slender dorsal walls of the bones, and with no foramen for a laterosensory branch, is an autapomorphy for R. cainguae. A detailed description of the skeleton and laterosensory system of R. cainguae is provided. The genus Rhamdella is rediagnosed on the basis of three autapomorphies: a very large opening in the frontal for the exit of the s6 (epiphyseal) branch of the supraorbital laterosensory canal (reversed in R. rusbyi), a large optic foramen, and a dark stripe along the lateral surface of the body (reversed in R. rusbyi). Rhamdella is considered to be the sister group of a large heptapterid clade composed of the Nemuroglanis sub-clade plus the genera Brachyglanis, Gladioglanis, Leptorhamdia, and Myoglanis. Rhamdella is herein restricted to five valid species: R. aymarae, R. cainguae, R. eriarcha, R. longiuscula, and R. rusbyi. A sister group relationship between R. aymarae and R. rusbyi is supported by three synapomorphies. Rhamdella cainguae shares 12 apomorphic features with R. eriarcha and R. longiuscula.Facultad de Ciencias Naturales y Muse

Anatomy and phylogenetic relationships of a new catfish species from northeastern Argentina with comments on the phylogenetic relationships of the genus Rhamdella Eigenmann and Eigenmann 1888 (Siluriformes, Heptapteridae)

Rhamdella cainguae, a new species of the family Heptapteridae is described from the Arroyo Cuña-Pirú, a tributary of the Río Paraná, in the subtropical forest of Misiones, northeastern Argentina. The presence of a large differentiated ovoid area on the supraorbital laterosensory canal along the frontal-sphenotic boundary, delimited by the slender dorsal walls of the bones, and with no foramen for a laterosensory branch, is an autapomorphy for R. cainguae. A detailed description of the skeleton and laterosensory system of R. cainguae is provided. The genus Rhamdella is rediagnosed on the basis of three autapomorphies: a very large opening in the frontal for the exit of the s6 (epiphyseal) branch of the supraorbital laterosensory canal (reversed in R. rusbyi), a large optic foramen, and a dark stripe along the lateral surface of the body (reversed in R. rusbyi). Rhamdella is considered to be the sister group of a large heptapterid clade composed of the Nemuroglanis sub-clade plus the genera Brachyglanis, Gladioglanis, Leptorhamdia, and Myoglanis. Rhamdella is herein restricted to five valid species: R. aymarae, R. cainguae, R. eriarcha, R. longiuscula, and R. rusbyi. A sister group relationship between R. aymarae and R. rusbyi is supported by three synapomorphies. Rhamdella cainguae shares 12 apomorphic features with R. eriarcha and R. longiuscula.Facultad de Ciencias Naturales y Muse

High-precision analysis of binary stars with planets. I. Searching for condensation temperature trends in the HD 106515 system

We explore the probable chemical signature of planet formation in the remarkable binary system HD 106515. The A star hosts a massive long-period planet with 9 MJup detected by radial velocity. We also refine stellar and planetary parameters by using non-solar-scaled opacities when modeling the stars. Methods. We carried out a simultaneous determination of stellar parameters and abundances, by applying for the first time non-solar-scaled opacities in this binary system, in order to reach the highest possible precision. Results. The stars A and B in the binary system HD 106515 do not seem to be depleted in refractory elements, which is different when comparing the Sun with solar-twins. Then, the terrestrial planet formation would have been less efficient in the stars of this binary system. Together with HD 80606/7, this is the second binary system which does not seem to present a (terrestrial) signature of planet formation, and hosting both systems an eccentric giant planet. This is in agreement with numerical simulations, where the early dynamical evolution of eccentric giant planets clear out most of the possible terrestrial planets in the inner zone. We refined the stellar mass, radius and age for both stars and found a notable difference of 78% in R compared to previous works. We also refined the planet mass to mp sini = 9.08 +/- 0.20 MJup, which differs by 6% compared with literature. In addition, we showed that the non-solar-scaled solution is not compatible with the classical solar-scaled method, and some abundance differences are comparable to NLTE or GCE effects specially when using the Sun as reference. Then, we encourage the use of non-solar-scaled opacities in high-precision studies such as the detection of Tc trends.[abridged]Comment: 9 pages, 10 figures, A&A accepted. arXiv admin note: text overlap with arXiv:1507.0812

A New Species of Hisonotus (Siluriformes, Loricariidae) of the Upper Río Uruguay Basin

A new species of the hypoptopomatine genus Hisonotus (Loricariidae) is described from a small tributary of the upper rı´o Uruguay basin near the border between Uruguay and Brazil. The new species can be distinguished from all other congeners by the following combination of characters: (1) presence of serrae along distal two thirds of posterior margin of pectoral-fin spine (versus serrae absent, posterior margin smooth); (2) odontodes along anterior margin of snout biserially arranged, dorsad and ventrad series separated by narrow odontode-free area covered by pad of soft tissue; (3) caudal peduncle short (27–34% SL, versus . 34% SL) and deep (13–15 % SL, versus , 13% SL); (4) eye large (15–19% HL, versus , 13% HL); and (5) caudal-fin pigmentation, when well defined, dark brown with a pair of whitish blotches on upper and lower lobes. The significance of the distribution of the new species is discussed relative to the degree of endemism of other fish groups in the Uruguay basin.Fil: Aquino, Adriana E.. American Museum of Natural History; Estados UnidosFil: Schaefer, Scott A.. American Museum of Natural History; Estados UnidosFil: Miquelarena, Amalia Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología ; Argentin

Arte para el alma

Arte para el alma es un proyecto en colaboración entre dos instituciones: el Servicio de Medicina Paliativa del HIGA (Hospital Rossi) y el Bachillerato de Bellas Artes, “Prof. Francisco de Santo” de la UNLP.Sección: Artículos de investigación y prácticas pedagógicasBachillerato de Bellas Artes "Prof. Francisco A. De Santo

The presence of <i>Trichomycterus davisi</i> (Haseman, 1911) in the High Paraná River, Argentina (Siluriformes: Trichomycteridae)

Se confirma la presencia de T. davisi (Trichomycterinae) en el noreste argentino, constituyendo el primer registro de la especie con localidades concretas para el país.The presence of T. davisi (Trichomycterinae) in the northeastern of Argentina, is confirmed. This is the first report of the species with precise localities for this country.Contribución científica Nº 661 del Instituto de Limnología "Dr. Raúl A. Ringuelet" (ILPLA).Facultad de Ciencias Naturales y Muse

The presence of <i>Trichomycterus davisi</i> (Haseman, 1911) in the High Paraná River, Argentina (Siluriformes: Trichomycteridae)

Se confirma la presencia de T. davisi (Trichomycterinae) en el noreste argentino, constituyendo el primer registro de la especie con localidades concretas para el país.The presence of T. davisi (Trichomycterinae) in the northeastern of Argentina, is confirmed. This is the first report of the species with precise localities for this country.Contribución científica Nº 661 del Instituto de Limnología "Dr. Raúl A. Ringuelet" (ILPLA).Facultad de Ciencias Naturales y Muse

The presence of <i>Trichomycterus davisi</i> (Haseman, 1911) in the High Paraná River, Argentina (Siluriformes: Trichomycteridae)

Se confirma la presencia de T. davisi (Trichomycterinae) en el noreste argentino, constituyendo el primer registro de la especie con localidades concretas para el país.The presence of T. davisi (Trichomycterinae) in the northeastern of Argentina, is confirmed. This is the first report of the species with precise localities for this country.Contribución científica Nº 661 del Instituto de Limnología "Dr. Raúl A. Ringuelet" (ILPLA).Facultad de Ciencias Naturales y Muse