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Neuquén, Argentina

De la Fuente M.S.,CONICET | Maniel I.J.,CONICET | Jannello J.M.,CONICET | Filippi L.S.,Museo Municipal Argentino Urquiza | And 2 more authors.
Comptes Rendus - Palevol | Year: 2015

The long-necked chelid turtle Yaminuechelys aff. maior is described on the basis of post-cranial material of two specimens from the Lower-Middle Campanian Anacleto Formation, nortwestern Patagonia (Argentina). These post-cranial remains are described macroscopically (external morphology) and microscopically (histological sections of the shell). Although minor carapace and plastral differences are reported (e.g., extension of the axillary buttresses on visceral surfaces of the first costal bone, curled bridge peripheral bones, absence of a sub-rectangular fenestra retained in adults) the specimens exibit the shell morphology and surface ornamentation of specimens referred to Y.. maior (Staesche, 1929) from Paleocene levels of the Salamanca Formation (Central Patagonia). This assignment is supported by a phylogenetic analysis, in which the new material is the most closely related to Y.. maior. As Yaminuechelys is hypothesized to be the sister taxon of Hydromedusa, the capability of Hydromedusa tectifera to adapt to changing environments and the survivorship of Yaminuechelys genus in K/P boundary is discussed. © 2015 Académie des sciences.

Arcucci A.B.,National University of San Luis | Filippi L.S.,Museo Municipal Argentino Urquiza | Calvo J.O.,National University of Comahue
Revista Brasileira de Paleontologia | Year: 2011

In this contribution, a new specimen of Mesoeucrocodylia from levels attributed to the Plottier Formation (Cretaceous, Upper Coniacian) is described in the locality Yacimiento Narambuena, Rincón de los Sauces, in the north section of the Neuquén Province. The material includes an incomplete subadult specimen with mostly articulated postcranium of an approximate length of 60 cm. The study and comparisons to allow distinguish the specimen from other Mesoeucrocodylia previously known from this same basin and suggest the presence of a new taxon, increasing the diversity of this clade in this period in the Neuquén Basin. The specimen from Rincon de los Sauces presents postcraneal characters previously attributed to Notosuchia and Neosuchia, both clades mainly defined by cranial characters. This set of primitive and derived characters prevents the location of its precise phylogenetic position among the Mesoeucrocodylia. © 2011 by the Sociedade Brasileira de Paleontologia.

Martinelli A.G.,Federal University of Rio Grande do Sul | Marinho T.D.S.,Institute Ciencias Exatas | Filippi L.S.,Museo Municipal Argentino Urquiza
Journal of South American Earth Sciences | Year: 2015

Isolated left prefrontal, left squamosal and atlas of titanosaur dinosaurs are described and compared. They come from the Late Cretaceous Serra da Galga Member of the Marília Formation at the Serra do Veadinho region, Peirópolis (Uberaba County, Minas Gerais State, Brazil). Due to the sparse cranial elements of titanosaurs already known from Brazil, these specimens are noticeable to be presented. In addition, the atlas vertebra is described for the first time for Brazilian titanosaurs. The morphology of the cranial bones closely resembles lithostratian titanosaurs, such as Rapetosaurus, rather than basal titanosaurs. The atlas is similar to that of other titanosaurs, suggesting that the anatomy of this element seems to be more conservative than other vertebral elements, in which vertebral laminae play an important rule in titanosaur taxonomy. © 2015 Elsevier Ltd.

Lio G.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Agnolin F.L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Agnolin F.L.,Maimonides University | Valieri R.J.,Museo de Ciencias de Anelo | And 2 more authors.
Historical Biology | Year: 2015

Peirosauridae is composed of mid- to large-sized terrestrial mesoeucrododylian crocodyliforms distributed throughout Gondwanan landmasses. Here we describe a new peirosaurid that comes from the upper levels of the Portezuelo Formation (Turonian–Coniacian, Upper Cretaceous) from Loma de la Lata, Neuquén Province, Argentina. This specimen consists of some associated bones belonging to a single individual. In order to facilitate comparisons, we recognise two different peirosaurid morphotypes based on skull shape: broad- and narrow-snouted taxa. The new taxon may be related to broad-snouted taxa, especially Gasparinisuchus peirosauroides. The new taxon here reported has strong heterodont dentition when compared with other peirosaurids. As in related forms, the fourth dentary tooth is caniniform, very large, acute and transversely compressed (much more than other peirosaurids), and the anterior dentary teeth have less globular, sharp serrated crowns. Large interalveolar spaces are present between both mandibular and maxillary teeth, a trait only observed on the new taxon. With this addition, we elevate the number of Patagonian peirosaurids to four. Moreover, it represents together with Lomasuchus palpebrosus the second peirosaurid species described for the Portezuelo Formation. © 2015 Taylor & Francis

Coria R.A.,CONICET | Coria R.A.,Dinosaur Institute | Filippi L.S.,Museo Municipal Argentino Urquiza | Chiappe L.M.,Dinosaur Institute | And 2 more authors.
Zootaxa | Year: 2013

A new lithostrotian sauropod, the small-sized Overosaurus paradasorum n. gen et sp. from the Anacleto Formation (Campanian, Late Cretaceous, Neuquén Group, Patagonia, Argentina) is here described. The specimen (MAU-Pv-CO-439) consists of a fully articulated vertebral series from the 10th cervical to the 20th caudal vertebra, the last cervical ribs, several dorsal ribs in articulation with their respective vertebrae, the complete right ilium and fragments of the left ilium. Overosaurus paradasorum is diagnosed by a unique combination of characters that includes (1) posterior cervical vertebrae with long pre- and postzygapophyses that project beyond the anterior and posterior borders of the centrum, respectively, (2) postspinal lamina absent in all dorsal neural spines, (3) wide and massive 9th and 10th caudal centra that are slightly excavated laterally and have relatively flat ventral surfaces, (4) laminar projection on the posterior border of the second and third dorsal rib, (5) ilium proportionally shorter anteroposteriorly and taller dorsoventrally than in other lithostrotians, and (6) the preacetabular process of the ilium strongly deflected laterally and with a ventrolaterally tapering end. Analysis of the phylogenetic relationships of Overosaurus places it within the AeoLosaurini, as the sister taxon of a monophyletic group formed by AeoLosaurus rionegrinus, A. maximus, Gondwanatitanfaustoi and Pitekunsaurus macayai. Overosaurus is a new representative of a highly diversified assemblage of Campanian lithostrotians from Patagonia that includes both AeoLosaurini and saltasaurids (e.g. Saltasaurus, Neuquensaurus)-this small new taxon falls within the low end of the size spectrum represented by these Late Cretaceous sauropods. © 2013 Magnolia Press.

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