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August 2015 - present
April 2007 - February 2011
April 2007 - August 2016
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September 1999 - March 2007
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Publications (157)
O sítio fossilífero Várzea do Agudo, no sul do Brasil (Sequência Candelária da Supersequência Santa Maria, Zona de Associação Hyperodapedon, Carniano), é conhecido por sua rica fauna de paleovertebrados, oferecendo valiosos insights paleoecológicos. Em relação às inferências icnológicas, estudos anteriores relataram bioerosão em ossos do cinodonte...
A paleohistologia oferece uma abordagem valiosa para determinar aspectos paleobiológicos de vertebrados extintos, como padrões de crescimento, modo de vida, idade e estágios ontogenéticos. Neste estudo, analisamos a fíbula e uma costela do espécime UFRGS-PV-0152-T (~3,8 m de comprimento) e uma costela do espécime UFRGS-PV-0156-T (~7,0 m de comprime...
The Chañares Formation is one of the best-known Middle to Upper Triassic fossiliferous units of South America, preserving a wide range of vertebrates, including fishes, synapsids (dicynodonts, cynodonts), and diapsids (e.g., rhynchosaurids, proterochampsids, gracilisuchids, loricatans, pterosauromorphs,
and dinosauromorphs). Here, we present the fi...
Prestosuchus chiniquensis is an iconic non‐crocodylomorph loricatan from the Brazilian Triassic beds and the best‐known taxon, represented by several specimens. The completeness and preservation of its skeleton make it a valuable taxon for paleobiological studies. We explore the microstructure of bone tissues of appendicular elements and ribs of th...
Recent surveys have revealed that among the 700+ extinct taxa described within Pseudosuchia, only 126 (18%) have been osteohistologically studied. Of these, approximately 73 (58%) belong to Crocodylomorpha. Extensive research on the osteohistology of Crocodylomorpha, in conjunction with studies on recent Crocodylia, provides a basis for understandi...
Pseudosuchians were the dominant group of archosaurs on continental ecosystems during the Triassic. However, studies that report palaeopathologies based on osteohistological evidence in this group are scarce. Here, two cases of palaeopathologies found in appendicular bones of two clades of pseudosuchians are presented: Aetosauria, a distal fragment...
Riojasuchus tenuisceps was a pseudosuchian archosaur from the Late Triassic period in Argentina. Like other ornithosuchids, it had unusual morphology such as a unique “crocodile‐reversed” ankle joint, a lesser trochanter as in dinosaurs and a few other archosaurs, robust vertebrae, and somewhat shortened, gracile forelimbs. Such traits have fuelled...
Our knowledge of the diversity and evolution of South American Triassic pseudosuchians has greatly improved in the past 15 years, due to new discoveries, but also to the revision of several historically important specimens. One of the earliest descriptions of pseudosuchians from the Triassic of Brazil stems from the classic work of Huene from the f...
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...
The Chañares Formation (Ischigualasto‐Villa Unión Basin) is worldwide known by its exquisitely preserved fossil record of latest Middle‐to‐early Late Triassic tetrapods, including erpetosuchids, “rauisuchians,” proterochampsids, gracilisuchids, dinosauromorphs, pterosauromorphs, kannemeyeriiform dicynodonts, and traversodontid, chiniquodontid and p...
Tarjadia ruthae is a quadrupedal terrestrial pseudosuchian from the Middle-early Upper Triassic of the Chañares Formation, La Rioja Province, Argentina. Originally, this species was identified as an indeterminate archosaur and later as a doswelliid archosauriform based on very fragmentary specimens characterized by the ornamentation of the skull ro...
Non‐crocodylomorph loricatans, traditionally known as “rauisuchians,” are considered as the top predators of the Triassic continental faunas that reigned before the emergence of the well‐known theropod dinosaurs. In particular, Saurosuchus galilei is a large quadrupedal prestosuchid loricatan found in the Ischigualasto Formation from northwestern A...
Decuriasuchus quartacolonia is a middle-sized basal "rauisuchian" (Pseudosuchia, Loricata) from the Triassic beds of Brazil, whose original description was based on 10 specimens of equivalent size found in aggregation. In this contribution, we explore the osteohistology of its appendicular bones and a rib, aiming to infer growth patterns and ontoge...
Proterochampsids are non-archosaurian archosauriforms spatio-temporally restricted to the latest Middle-early Late Triassic of Argentina and Brazil. They are the closest relatives to Archosauria and are crucial to understanding the assemblage of the Archosaurian body plan. Gualochus reigi is the least known proterochampsid species of the Chañares F...
Aetosauria is a widespread group of quadrupedal pseudosuchian archosaurs from the Upper Triassic, characterized by their heavily armored bodies. Particularly, Aetosauroides scagliai is a nonstagonolepidid aetosaur from the Upper Triassic of South America, recovered from the Ischigualasto Formation (Ischigualasto-Villa Unión Basin) in Argentina and...
Aetosaurs were a terrestrial group of pseudosuchians distributed globally during the Late Triassic. The here studied specimen measures only approximately 25 cm in total body length, is covered in a carbonate concretion and it shows a nearly completel articulation. Propagation phase contrast synchrotron X-ray micro computed tomography, applied in th...
"Rauisuchia" is a non-monophyletic group of quadrupedal and carnivorous pseudosuchians that inhabited the entire world during the Middle-Upper Triassic period (Anisian/Ladinian-Rhaetian). In South America, "rauisuchians" reached the largest sizes among continental carnivores. Despite their important ecological role, some aspects of their palaeobiol...
Studies on paleohistology are crucial to understand the life history of extinct
vertebrates. In this contribution we sampled apendicular bones (humerus, radius,
una, femur, tibia, fibula) of Decuriasuchus quartacolonia (MCPV10.005b;
MCNPV10.005x), a middle-sized carnivorous "rauisuchian" (~2,7m in length)
assigned to the Dinodontosaurus Assemblage...
Two lineages of Kannemeyeriiformes (Synapsida, Dicynodontia) are currently known in the Ladinian–Carnian Chañares Formation (Ischigualasto-Villa Unión Basin, Argentina): stahleckeriine stahleckeriids, based upon postcrania, and a single non-stahleckeriine species, Dinodontosaurus brevirostris, known mostly by cranial material. Available data on the...
During the Late Triassic of Argentina, the continental tetrapod diversity is mainly
represented by archosauriforms like Proterochampsia, Aetosauria, Erpetosuchidae,
Ornithosuchidae, Poposauroidea, and Loricata, among others sauropsids. Saurosuchus galilei Reig 1959 is a quadrupedal, short-necked large basal loricatan (Pseudosuchia) recovered from t...
Saurosuchus gallilei is a well-known prestosuchid loricatan from the Upper Triassic of Ischigualasto Formation in Argentina. Basal loricatans are terrestrial quadrupedal
hypercarnivores with recurved serrated teeth, sizes reaching up to 7 meters, and
numerous convergent characteristics with theropod dinosaurs. This group is considered a key compone...
Archosauriformes is a very diverse group of reptiles, that includes the clade Archosauria –the ruling reptiles–represented by Pseudosuchia (crocodylians) and Avemetatarsalia (birds). During the Triassic Period, pseudosuchians, in particular, are represented by an enormous diversity of body forms, sizes, and life habits that mainly dominated the con...
In the present contribution we study a fragmentary specimen of Crocodylomorpha recovered from outcrops of the Los Colorados Formation (Late Triassic) of the Ischigualasto-Villa Unión Basin. The material (PULR-V126) was deposited in the Museo de Ciencias Naturales of the Universidad Nacional de La Rioja, without any other data of origin or collector...
ARGENTINEAN WOMEN IN PALEOHERPETOLOGY: A HISTORY OF ALMOST 100 YEARS. The history of Argentinean women in the
development of paleoherpetology is very interesting and crucial, evidencing the role of women in the academic field, in the family environment, and the society. Throughout almost 100 years, the investigations carried out by women have been...
Aetosaurs were a group of armoured pseudosuchians, recorded in most of the Upper Triassic continental deposits worldwide. Several osteohistological contributions of aetosaurs focused on their osteoderms, but rarely on appendicular bones. Here, we analyse the microstructure of the humerus, femur and tibia of Aetosauroides scagliai (specimens PVL 207...
The lower jaw of early tetrapods is composed of several intramembranous ossifications. However, a tendency toward the independent reduction of the number of bones has been observed in the mandible of mammals, lepidosaurs, turtles, crocodiles, and birds. Regarding archosaurs, the coronoid and prearticular bones are interpreted to be lost during the...
En un ámbito donde la presencia de mujeres no era particularmente común, Mathilde
Dolgopol de Sáez (1901-1957) se destacó como la primera paleontóloga de Argentina.
Sus investigaciones en vertebrados e invertebrados fósiles, desde el año 1927 hasta
su muerte, son conocidas a nivel mundial, pero no así su interesante vida profesional y
personal. Has...
Aetosaurs were a group of heavily armoured pseudosuchians, recorded in most of the Triassic continental deposits worldwide. Several osteohistological contributions of aetosaurs focused mostly in their osteoderms, but faintly in appendicular bones. Here we performed the first osteohistological study since appendicular bones on a South American aetos...
In the present contribution we revise, figure, and redescribe several isolated braincases of the iconic aetosaur Desmatosuchus from the Placerias Quarry locality, Chinle Formation, Arizona, United States. The detailed study of the isolated braincases from the UCMP collection allowed us to assign them at the species‐level and recognize two species o...
Aetosaurs are an archosaur group with a worldwide distribution during the Late Triassic. They were quadrupedal amniotes, had small heads relative to their body size, and had a long tail. Characterized by a dorsal and ventral carapace formed by ornamented and articulated osteoderms, aetosaur feeding ecology is poorly understood. Although aetosaurs a...
Aetosauria represents a remarkable clade of armored pseudosuchians in which some of its oldest members are recovered from late Carnian units of Brazil. Three species are known: the mid-sized aetosaur Aetosauroides scagliai, which also occurs in Argentina, and two small-sized species, Aetobarbakinoides brasiliensis and Polesinesuchus aurelioi. We pr...
Proterochampsids were a group of stem archosaurs from the Middle-Late Triassic of South America. Using for the first time in proterochampsids quantitative microanatomical and morphological data and an inference model, we analyze the microstructure of postcranial bones of proterochampsids to infer life-history traits dealing with growth dynamics, on...
The phylogenetic relationships of Pseudosuchia, the crocodile-line of Archosauria, are still poorly resolved, in part, due to the lack of crucial braincase information for several key taxa. Recently, erpetosuchids and ornithosuchids have been recovered as close relatives to Aetosauria, sharing several braincase features. Here we provide the descrip...
Bevor die Dinosaurier zu der beherrschenden Tiergruppe des Erdmittelalters (Mesozoikum)
wurden, gab es in der Zeit der Trias (vor ca. 252 bis vor 201 Millionen Jahren)
eine große Fülle von Reptilien, die viele der ökologischen Nischen besetzt hatten. Die
meisten dieser Reptilien gehörten dabei, wie die Dinosaurier auch, zu den »herrschenden
Reptili...
The kannemeyeriiforms of the latest Ladinian-?early Carnian Chañares Formation (Ischigualasto-Villa Unión Basin) exemplify the historical taxonomic controversies of several South American dicynodonts. Three taxa were originally recognized based on skull anatomy: “Chanaria” platyceps and two species of Dinodontosaurus (genus otherwise known in the P...
Rhynchosaurs were quadrupedal, bulky herbivorous archosauromorph diapsids with a highly specialized dental apparatus. This group is restricted to the Triassic Period and became extremely abundant worldwide during the late Carnian, numerically dominating some of the first dinosaur-bearing assemblages. Despite their high abundance in upper Carnian be...
Gracilisuchus stipanicicorum Romer, 1972 is a basal suchian from the Late Triassic Chañares Formation (Argentina), nested in the recently erected Gracilisuchidae, along with Turfanosuchus dabanensis Young, 1973 and Yonghesuchus sangbiensis Wu et al., 2001 from China. The six known specimens of Gracilisuchus Romer, 1972 preserve most of the skeleton...
Present knowledge of Late Triassic tetrapod evolution, including the rise of dinosaurs, relies heavily on the fossil-rich continental deposits of South America, their precise depositional histories and correlations. We report on an extended succession of the Ischigualasto Formation exposed in the Hoyada del Cerro Las Lajas (La Rioja, Argentina), wh...
Ornithosuchidae is one of the most enigmatic clades of Triassic pseudosuchians. The group is composed by three carnivorous species that were excavated from Upper Triassic beds of Scotland and Argentina. We describe the first ornithosuchid from the Upper Triassic sediments of Brazil and explore its phylogenetic affinities and implications for the ev...
A review of the type and referred material of von Huene shows that Prestosuchus
is a valid taxon represented by, at least, three different species: the lectotype and paralectotype
of Prestosuchus chiniquensis, an unnamed species from Brazil (UFRGS-PV-
0152-T), and the new combination Prestosuchus nyassicus (=Stagonosuchus nyassicus).
Several more r...
Ornithosuchidae is a group of terrestrial quadrupedal pseudosuchian archosaurs from the Late Triassic of South America and Europe. Riojasuchus tenuisceps is arguably one of the best representative species of this clade because it comprises very well-preserved three-dimensional, almost complete skeletons. However, R. tenuisceps was originally descri...
Studies on living turtles have demonstrated that shells are involved in the
resistance to hypoxia during apnea via bone acidosis buffering; a process
which is complemented with cutaneous respiration, transpharyngeal and
cloacal gas exchanges in the soft-shell turtles. Bone acidosis buffering
during apnea has also been identified in crocodylian oste...
Los proterochámpsidos fueron un grupo de arcosauriformes basales cuadrúpedos procedentes de sedimentos continentales del Triásico Medio-Superior de Sudamérica. Con el objeto de dilucidar aspectos relacionados a la historia de vida, estadios ontogenéticos yrelación entre maduración somática y esquelética, se efectuó un estudio paleohistológico de cu...
The lower Carnian levels of the Chañares Formation (Ischigualasto‐Villa Unión Basin, La Rioja Province) have yielded some of the most informative dinosaur precursor species known so far. However, these species are based on partial skeletons that in several cases hamper the comparison between them because of the absence of overlapping bones. This ha...
The proterochampsids are crocodile-like, small- to medium-sized, quadrupedal and predatory stem-archosaurs. The rhadinosuchines are a clade of deeply nested proterochampsids that are the most abundant diapsids of the Massetognathus-Chanaresuchus Assemblage Zone of the Chañares Formation (lower Carnian) of north-western Argentina. Here, we describe...
Los ornitosúquidos fueron un grupo triásico de arcosaurios pseudosuquios, cuadrúpedos a bípedos facultativos, de hasta 2 metros de longitud. Poseían dos hileras de osteodermos paramediales imbricados. Esta contribución se enfoca en un análisis morfohistológico efectuado en tres osteodermos (cervicales y dorsales) de Riojasuchus tenuisceps (PVL 3814...
Prestosuchus chiniquensis is the most famous “rauisuchian” described by Friedrich von Huene, eight decades ago, and
several specimens have been assigned to this taxon since then. In the present contribution, we provide the first detailed
description of a complete and very well preserved skull (including the braincase) assigned to Prestosuchus chini...
The paleoneuroanatomy of pseudosuchian archosaurs is poorly known, based on direct examination of the internal morphology of braincases and a few artificial endocasts. Among aetosaurs, only one endocast has been described almost a century ago by Case (1921) corresponding to Desmatosuchus spurensis from the Chinle Formation (Norian) of Texas, US, ba...
‘Alert’ or ‘neutral’ orientation of the skull of Neoaetosauroides engaeus based on the digital reconstruction of PVL 5698 and PVL 4363 skulls overlapped
Black line and dotted line, horizontal plane; green line, main axis of the lateral semicircular canal; yellow line, snout orientation. The angles between the ventral surface of the braincase and pa...
3D pdf of the skull of Neoaetosauroides engaeus based on the specimens PVL 4363 and PVL 5698
Fossil skull in brown, encephalon in blue, inner ear in orange, cranial nerves in yellow, and middle ear sinus system in green.
Aetosauria, which includes 30 species, is a diverse group of armored pseudosuchian archosaurs restricted to Upper Triassic beds. Three species occur in Brazil, and one of these, Aetosauroides scagliai Casamiquela, 1960, also occurs in Argentina. The specimen UFSM 11505, found at Faixa Nova–Cerrito I Outcrop, Santa Maria Formation (Hyperodapedon Ass...
Character/Taxon matrix.
(TXT)
Decuriasuchus quartacolonia is known by an exclusively assemblage of nine associated individuals (MCNPV10.105a-i) and a partial disarticulated skull (MCN-PV10.004) from Santa Maria 1 Sequence (Santa Maria Formation). The material is housed at the Fundação Zoobotânica de Porto Alegre, Brazil, a n d r e p r e s e n t s t h e s i s t e r t a x o n o f...
One of the most striking features of aetosaurs is the possession of an extensive bony armour composed of dorsal, ventral and appendicular osteoderms. With the purpose of establishing the main histological changes during ontogeny and the degree of histological variation within the armour, we analysed the bone histology of dorsal (paramedian and late...
The early late Triassic Chañares Formation of Argentina contains one of the richest tetrapod-bearing assemblages of this age worldwide and is important for understanding the origin and early radiation of suchians, dinosauromorphs, and mammaliaforms. Here, we describe the fabric and microfossil content of herbivore coprolites produced by large kanne...
Gracilisuchus stipanicicorum Romer, 1972a, the only species in its genus, is a small basal suchian, recovered from the Middle-Late Triassic Chañares Formation (La Rioja, Argentina). This species has been interpreted as related to various taxa within Archosauria, including Ornithosuchidae, Rauisuchidae and Crocodylomorpha. Recent phylogenetic analys...
Osteoderms are common in most archosauriform lineages, including basal forms, such as doswelliids and proterochamp-sids. In this survey, osteoderms of the doswelliids Doswellia kaltenbachi and Vancleavea campi, and proterochampsid Chanaresuchus bonapartei are examined to infer their palaeobiology, such as histogenesis, age estimation at death, deve...
