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San Miguel de Tucumán, Argentina

Goloboff P.A.,CONICET | Goloboff P.A.,Instituto Miguel Lillo | Catalano S.A.,CONICET
Cladistics | Year: 2012

This paper presents a pipeline, implemented in an open-source program called GB→TNT (GenBank-to-TNT), for creating large molecular matrices, starting from GenBank files and finishing with TNT matrices which incorporate taxonomic information in the terminal names. GB→TNT is designed to retrieve a defined genomic region from a bulk of sequences included in a GenBank file. The user defines the genomic region to be retrieved and several filters (genome, length of the sequence, taxonomic group, etc.); each genomic region represents a different data block in the final TNT matrix. GB→TNT first generates Fasta files from the input GenBank files, then creates an alignment for each of those (by calling an alignment program), and finally merges all the aligned files into a single TNT matrix. The new version of TNT can make use of the taxonomic information contained in the terminal names, allowing easy diagnosis of results, evaluation of fit between the trees and the taxonomy, and automatic labelling or colouring of tree branches with the taxonomic groups they represent. © The Willi Hennig Society 2012.

Martin P.R.,Instituto Miguel Lillo | Gibon F.-M.,French Natural History Museum | Molina C.I.,Higher University of San Andres
Zootaxa | Year: 2011

Six new species of Oecetis are described from Bolivia: O. carlibanezae, O. chipiriri, O. dominguezi, O. oberdorffi, O. pseudoamazonica and O. traini. Eight previously described species are recorded from Bolivia and northwestern Argentina: O. amazonica (Banks 1924), O. avara (Banks 1895), O. exisa Ulmer 1907, O. inconspicua (Walker 1852), O. knutsoni Flint 1981, O. paranensis Flint 1982a, O. punctipennis (Ulmer 1905) and O. rafaeli Flint 1991b. This work contains an identification key for males of Oecetis species from Mexico, Central and South America.

Babot J.,Fundacion Miguel Lillo | Lopez D.A.G.,Instituto Miguel Lillo | Gaudin T.J.,University of Tennessee at Chattanooga
Journal of Vertebrate Paleontology | Year: 2012

In this study we describe an isolated petrosal from the middle Eocene of northwestern Argentina assigned to Dasypodinae (Mammalia, Xenarthra, Cingulata). The specimen was recovered from the Geste Formation, Antofagasta de la Sierra, Catamarca, Argentina. The material is an incomplete right petrosal preserving the pars cochlearis and the anterior third of the pars canalicularis. It is described in detail and compared with extant and fossil cingulates. Additionally, we performed a cladistic analysis in order to define its phylogenetic position. The most remarkable traits of this petrosal include an anteromedially-posterolaterally elongated promontorium, open cavum supracochleare, wide and smooth crista interfenestralis, roof of the post-promontorial tympanic sinus triangular, reduced, and well separated from the stapedius fossa, and poorly developed epitympanic wing and crista petrosa. The phylogenetic analysis reveals affinities with Dasypus and Stegotherium that are supported by the weakly developed crista petrosa and the reduced dorsal and ventral extension of the cerebellar surface of the pars cochlearis in relation to the size of the internal acoustic meatus. The information provided by this element indicates the existence of several characters that were already present in the Eocene, such as an elongated promontorium, and a step between the stapedius fossa and the roof of the post-promontorial tympanic sinus. We propose hypotheses of evolutionary change in the auditory region of cingulates, including the medial expansion of the roof of the post-promontorial tympanic sinus and the emergence of a conspicuous crista petrosa. © 2012 Taylor & Francis Group, LLC.

Hayes F.E.,Pacific Union College | Capllonch P.,Instituto Miguel Lillo | Montero R.,CONICET
Revista Brasileira de Ornitologia | Year: 2016

Twelve species of birds have been reported to prey upon amphisbaenians (Squamata: Amphisbaenidae). We document the first report of predation on an amphisbaenian by a heron (Pelecaniformes: Ardeidae). On 1 November 2012 we photographed a Whistling Heron Syrigma sibilatrix preying on an Amphisbaena heterozonata at Tucumán, Argentina. © 2015, Sociedade Brasileira de Ornitologia. All rights reserved.

Agnolin F.L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Agnolin F.L.,Maimonides University | Powell J.E.,Instituto Miguel Lillo | Powell J.E.,CONICET | And 3 more authors.
Cretaceous Research | Year: 2012

The Alvarezsauridae represents a branch of peculiar basal coelurosaurs with an increasing representation of their Cretaceous radiation distributed worldwide. Here we describe a new member of the group, Bonapartenykus ultimus gen. et sp. nov. from Campanian-Maastrichtian strata of Northern Patagonia, Argentina. Bonapartenykus is represented by a single, incomplete postcranial skeleton. The morphology of the known skeletal elements suggests close affinities with the previously described taxon from Patagonia, Patagonykus, and both conform to a new clade, here termed Patagonykinae nov. Two incomplete eggs have been discovered in association with the skeletal remains of Bonapartenykus, and several clusters of broken eggshells of the same identity were also found in a close proximity. These belong to the new ooparataxon Arriagadoolithus patagoniensis of the new oofamily Arriagadoolithidae, which provides first insights into unique shell microstructure and fungal contamination of eggs laid by alvarezsaurid theropods. The detailed study of the eggs sheds new light on the phylogenetic position of alvarezsaurids within the Theropoda, and the evolution of eggs among Coelurosauria. We suggest that plesiomorphic alvarezsaurids survived in Patagonia until the latest Cretaceous, whereas these basal forms became extinct elsewhere. © 2011 Elsevier Ltd.

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