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Publications
Publications (66)
A new sauropodomorph dinosaur from the Late Triassic Candelária Sequence (Santa Maria Formation), south Brazil, Bagualosaurus agudoensis gen. et sp. nov., helps to fill a morphological gap between the previously known Carnian members of the group and younger sauropodomorphs. In some aspects, the skull, lower jaw, and dental anatomy of the new taxon...
Predatory dinosaurs were an important ecological component of terrestrial Mesozoic ecosystems. Though theropod dinosaurs carried this role during the Jurassic and Cretaceous Periods (and probably the post-Carnian portion of the Triassic), it is difficult to depict the Carnian scenario, due to the scarcity of fossils. Until now, knowledge on the ear...
The Triassic deposits of South America are key to understand the early radiation of Dinosauromorpha. Though the fossil record of the group is relatively abundant in Carnian- and Norian-aged strata from Argentina and Brazil, Middle Triassic dinosauromorphs are scarce, at least in the Brazilian record. In this contribution, we describe a set of fossi...
Irajatherium hernandezi is a poorly known non‐mammaliaform cynodont from the Late Triassic of southern Brazil. A new specimen of this cynodont was found in recent fieldwork to the type‐locality, Sesmaria do Pinhal (Candelária), providing new insights into the anatomy of this mammalian forerunner. This specimen comprises a partial skull preserving t...
The fusion of the sacrum occurs in the major dinosaur lineages, i.e. ornithischians, theropods, and sauropodomorphs, but it is unclear if this trait is a common ancestral condition, or if it evolved independently in each lineage, or even how or if it is related to ontogeny. In addition, the order in which the different structures of the sacrum are...
The Linha São Luiz Geosite is one of the most remarkable outcrops from the central region of Rio Grande do Sul state, southern Brazil. With more than 20 meters of vertical exposure, the locality preserves records of distinct sedimentary episodes, and one of the richest fossil assemblages known in southern Brazil. After a quarter of a century from t...
The Triassic period stands as a crucial moment for understanding tetrapod evolution, marking the emergence and early diversification of numerous lineages that persist in today's ecosystems. Birds, crocodiles, testudines, lizards, and mammals can all trace their origins to the Triassic, which is distinguished by several adaptive radiation events tha...
Prestosuchus chiniquensis is the best represented pseudosuchian archosaur from the Pinheiros-Chiniqu a Sequence, Middle-Late Triassic (Ladinian/Carnian) of the Santa Maria Supersequence, Southern Brazil. Several incomplete specimens attributed to this species have been described, but the morphology of the postcranial skeleton of P. chiniquensis is...
Traversodontidae, a clade of gomphodont cynodonts, thrived during the Middle and Late Triassic, displaying a wide geographical distribution. During fieldwork in 2009, a new specimen was discovered in Ladinian/early Carnian stratigraphic layers in southern Brazil. Here, we describe this specimen and propose a new taxon closely related to Traversodon...
Proterochampsids are a group of South American nonarchosaurian
archosauriforms whose general morphology has been historically likened to that of the extant Crocodylia, which purportedly exhibited similar habits by convergence. Taxa from the genus Proterochampsa, for example, show platyrostral skulls with dorsally faced orbits and external nares and...
The Carnian (Upper Triassic) rocks of the Candelária Sequence present a rich record of dinosaurs, including some of the oldest known dinosaurs worldwide. In this contribution we describe the first unequivocal dinosaur from the Pivetta site, located in the Restinga Sêca municipality, Southern Brazil. The specimen CAPPA/UFSM 0373 is an isolated but w...
Agudotherium gassenae is a poorly known non‐mammaliaform probainognathian cynodont from the Late Triassic of southern Brazil. It is known only by mandibular remains, and its affinities within Probainognathia are unclear. Furthermore, its phylogenetic affinities were never investigated through computational analyses. In this study, we described new...
Buriolestes schultzi is a small sauropodomorph dinosaur from Carnian beds (ca., 233 Ma) of southern Brazil. It is one of the earliest members of that lineage and is a key taxon to investigate the initial evolution of Sauropodomorpha. Here, we attribute a new specimen to B. schultzi from Late Triassic of southern Brazil, which represents the first o...
Proterochampsidae is a clade of non-archosaurian archosauriforms restricted to the Middle to the Late Triassic of the Ischigualasto-Villa Unión Basin of Argentina and the Santa Maria Supersequence of Brazil. A reappraisal of proterochampsid specimens from the Brazilian Dinodontosaurus Assemblage Zone (AZ) of the Pinheiros-Chiniquá Sequence (late La...
The origin of the air sac system present in birds has been an enigma for decades. Skeletal pneumaticity related to an air sac system is present in both derived non-avian dinosaurs and pterosaurs. But the question remained open whether this was a shared trait present in the common avemetatarsalian ancestor. We analyzed three taxa from the Late Trias...
Loricatans have an almost worldwide distribution, with a diverse range of body plans and a temporal distribution that extends from the Triassic Period until the present. Middle-Upper Triassic strata from southern Brazil preserved several records of Loricata traditionally bundled as ‘Rauisuchians’, including Prestosuchus chiniquensis, Decuriasuchus...
Desde os anos 2000, a proposta de reconhecimento dos geoparques como territórios que promovem o patrimônio da Terra e sustentam as comunidades locais por meio da conservação e uso sustentável do seu patrimônio, tem se consagrado como um novo paradigma em termos de desenvolvimento territorial. Nesse sentido, o objetivo deste artigo é apresentar os a...
The present 3D dataset contains the 3D models of the holotype of Proterochampsa nodosa that were built and analysed in “Redescription, taxonomic revaluation, and phylogenetic affinities of Proterochampsa nodosa (Archosauriformes: Proterochampsidae), early Late Triassic of Candelaria Sequence (Santa Maria Supersequence)”.
Proterochampsidae are a group of predatory, putatively semi-aquatic, archosauriforms endemic to the Middle and Upper Triassic strata of Argentina and Brazil (Ischigualasto Formation and Santa Maria Supersequence). Here, the Brazilian species Proterochampsa nodosa from the Candelária Sequence (Santa Maria Supersequence of the Paraná Basin) is revisi...
Faxinalipterus minimus was originally described as a purported pterosaur from the Late Triassic (early Norian) Caturrita Formation of southern Brazil. Its holotype comprises fragmentary postcranial elements, whereas a partial maxilla was referred to the species. The assignment of Faxinalipterus minimus to Pterosauria has been questioned by some stu...
In this paper, we study the postcranial morphology (humerus, ulna, innominate, femur, tibia, astragalus, navicular, and metatarsal III) of Neoepiblema, a giant Late Miocene South American rodent, searching for evidence about its paleobiology based on unpublished specimens from Solimões Formation (Upper Miocene, Brazil). The study includes a morphof...
Loricata is a group of hypercarnivorous pseudosuchian archosaurs that reached the status of top predators in ecosystems from the Middle to Late Triassic. Although the record of taxa pertaining to this group is abundant in rocks of the lower portion of the Santa Maria Supersequence (Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone) of so...
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Upper Triassic (Carnian) strata from the Candelária Sequence of southern Brazil bear the oldest records of dinosaurs worldwide. In consequence, investigation of the specimens yielded by these fossiliferous units is crucial for a more comprehensive knowledge regarding the origin, early diversification and radiation of dinosaurs. Herein we reassess a...
The present 3D Dataset contains the 3D models of the sacral vertebrae analyzed in "Sacral co-ossification in dinosaurs: The oldest record of fused sacral vertebrae in Dinosauria and the diversity of sacral co-ossification patterns in the group".
Our knowledge on the anatomy of the first dinosaurs (Late Triassic, 235–205 Ma) has drastically increased in the last years, mainly due to several new findings of exceptionally well-preserved specimens. Nevertheless, some structures such as the neurocranium and its associated structures (brain, labyrinth, cranial nerves, and vasculature) remain poo...
The Janner site (Upper Triassic of Southern Brazil) has been intensely explored, yielding constant new findings in recent years. Among these some fragmentary dinosaur specimens still not published were sampled. In this contribution, we describe these specimens, which represent five individuals, in order to increase our understanding on the anatomy...
Traversodontidae is a less inclusive clade of cynognathian cynodonts that lived during the Triassic. Recently, a traversodontid from the southern Brazilian Triassic beds was described – Siriusgnathus niemeyerorum – based upon specimens found exclusively in its type-locality. No absolute age or index fossils have been reported for this
locality, whi...
Proterochampsidae é um pequeno grupo de arcossauriformes endêmicos ao Triássico Médio e Superior das formações Chañares e Ischigualasto da Argentina, e à Supersequência Santa Maria do Brasil. Proterochampsa nodosa (MCP 1694 PV) é um crânio longirostro, dorsoventralmente comprimido e com a mandíbula oclusionada, tendo perdido somente a porção poster...
The present 3D Dataset contains the 3D models of the skull, brain and inner ear endocast analyzed in "Gnathovorax cabreirai: a new early dinosaur and the origin and initial radiation of predatory dinosaurs". Model IDs Description M3#442 3D model of the skull M3#443 3D model of the braincase M3#444 Endocast of brain, inner ear, and cranial nerves Ta...
O desenvolvimento de ações educativas em paleontologia é agente potencial na valorização e proteção do patrimônio paleontológico. Nesse sentido, o evento Paleodia é promovido anualmente pelo Centro de Apoio à Pesquisa Paleontológica (CAPPA) e pelo Centro de Ciências Naturais e Exatas (CCNE) da UFSM, visando divulgar a paleontologia e os fósseis da...
Os Proterochampsidae são arcossauriformes endêmicos ao Gondwana do Triássico Médio e Superior, com representantes das Formações Ischigualasto e Chañares da Argentina e da Supersequência Santa Maria do Rio Grande do Sul. Proterochampsa nodosa provém do município de Candelária, de localidade distante 10 km a oeste do Cerro Boturaraí. O espécime é um...
The early evolution of lepidosaurs is marked by an extremely scarce fossil record during the Triassic. Importantly, most Triassic lepidosaur specimens are represented by disarticulated individuals from high energy accretion deposits in Laurasia, thus greatly hampering our understanding of the initial stages of lepidosaur evolution. Here, we describ...
Discoveries in Carnian-aged rocks are establishing a rich and diverse dinosaurian fauna at the so-called 'dawn of the age of dinosaurs' in the Late triassic of Western Gondwana. Accordingly, Brazilian strata from the Candelária Sequence have contributed extensively to this trend. here, we present a new dinosaurian specimen (CAPPA/UFSM 0200) from th...
Nesta contribuição, reavaliam-se materiais de um grande dinossauro (UFSM 11330), previamente atribuídos a Sauropodomorpha que corresponderiam, ao maior sauropodomorfo Carniano registrado até então. Além da reinterpretação desse espécime, conhecido informalmente como "Saturnalião", são incluídos neste estudo materiais inéditos deste espécime. Juntam...
Loricata é a linhagem de arcossauros mais relacionada aos crocodilos que às aves, e inclui táxons cuja sistemática é amplamente debatida. Seu registro no Triássico brasileiro é expressivo em afloramentos correlatos à Zona de Associação (ZA) de Dinodontosaurus (Sequência Pinheiros-Chiniquá), onde representam um dos principais grupos de tetrápodes pr...
A new Upper Triassic fossiliferous outcrop, the Niemeyer Site, from the Santa Maria Supersequence (Paraná
Basin, Southern Brazil) is reported. The lithology found in this locality is consistent with that found in the
Candelária Sequence. The high prevalence of traversodontid cynodonts in this site is particularly notable, with
collected specimens m...
Saturnaliinae is a group of Carnian sauropodomorphs, mainly represented by Chromogisaurus Ezcurra, 2010 and Saturnalia Langer, 1999. Pelvic girdle elements are frequently preserved in its representatives, which are characterized by conspicuous rugosities in the iliac dorsal portion, representing muscle scars (iliac blade rugosity, IBR; post-acetabu...
A recently published study [1] reassessed the phylogenetic relationships of Chilesaurus diegosuarezi, proposing its affinities to ornithischians rather than theropods as previously suggested [2]. However, we observed that the results presented by Baron & Barrett [1] could not be replicated using the same dataset and parameters provided by the autho...
We present a new herrerasaurid specimen from the Cerro da Alemoa outcrop, Santa Maria city. UFSM 11608 is under preparation, already showing: associated skull and mandible; two cervical vertebrae; at least 12 presacral articulated vertebrae with associated ribs; both femora, tibiae and fibulae. Based on the exposed materials, it is possible to eval...
Dinossauros do Sul do Brasil e da Argentina estão entre os mais antigos registrados ao
redor do mundo, sendo, portanto, de fundamental importância para o estudo da origem e
diversificação desta linhagem. O ílio é um osso bem representado nos dinossauros mais
basais e contém informações suficientes para sua identificação mesmo, quando encontrado
iso...
The axial skeleton is proportionally underrepresented in the fossil record of early dinosaurs, when compared to other skeletal parts (e.g., pelvic girdle and hindlimb). For instance, the axis is poorly known in early dinosaurs, which precludes a better understanding of this important anatomical structure. Therefore, the present contribution fills a...
As localidades fossilíferas da região central do estado do Rio Grande do Sul (RS), principalmente da Quarta Colônia e Santa Maria são reconhecidas mundialmente quanto à origem dos dinossauros. Junto com a Argentina, sítios do Triássico Superior desta região possuem alguns dos registros mais antigos de dinossauros, tais como o saurísquio Guaibasauru...
The ‘Botucaraí Hill’ outcrop yielded a diverse Late Triassic vertebrate fauna, including several dinosaur remains, but most collected specimens are represented only by isolated bones. We present here a new dinosaur tibia from that site, particularly notable for its small size. Anatomical comparisons and a phylogenetic analysis support a sauropodomo...
Pretto, F.A., Schultz, C.L., Langer, M.C. 4.02.2015. New dinosaur remains from the Late Triassic of southern Brazil (Candelária Sequence, Hyperodapedon Assemblage Zone). Alcheringa 39, xxx–xxx. ISSN 0311-5518The oldest unequivocal dinosaurian records come from Upper Triassic strata, mostly from Argentina and Brazil. Recent fieldwork in the Brazilia...
2014. Tooth microstructure of the Early Permian aquatic predator Stereosternum tumidum. Acta Palaeontologica Polonica 59 (1): 125–133. A histological investigation of the feeding apparatus of a Stereosternum specimen revealed a great number of adaptations in the structure and insertion of teeth, to deal with breakage risks. The tooth wall is compos...
Exaeretodon riograndensis Abdala, Barberena, & Dornelles, 20025.
Abdala , F. ,
Barberena , M.C. and
Dornelles , J.E.F. 2002. A new species of the traversodontid cynodont Exaeretodon from the Santa Maria Formation (Middle/Late Triassic) of Southern Brazil. Journal of Vertebrate Paleontology, 22: 313–325. [Taylor & Francis Online], [Web of Science...
Crustaceans (Pygocephalomorpha, Peracarida) are the main fossil invertebrates recorded in the Early Permian Assistência Formation, Irati Subgroup, State of São Paulo, Paraná Basin. For this study, samples taken from the base of the Ipeúna Member, Bairrinho Bed, State of São Paulo, were analyzed and complemented by fossils from the Irati Formation,...
