A dinosaur ilium from the Late Triassic of Brazil with comments on key-character supporting Saturnaliinae

Garcia, Maurício Silva; Pretto, Flávio Augusto; Dias‐da‐Silva, Sérgio; Müller, Rodrigo Temp

doi:10.1590/0001-3765201920180614

Cited by 22 publications

(20 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Locality and Horizon: Marchezan site (29°37′52″S; 53°27′02″W), municipality of São João do Polêsine, Rio Grande do Sul, Brazil (Fig. 1A); Santa Maria Formation, Candelária Sequence, Paraná Basin ( sensu Horn et al, 2014); stratigraphically correlated beds from a nearby site were dated as mid-Carnian (ca 233.23 ± 0.73), Late Triassic (Langer, Ramezani & Da-Rosa, 2018).…”

Section: Resultsmentioning

confidence: 99%

Gnathovorax cabreirai: a new early dinosaur and the origin and initial radiation of predatory dinosaurs

Pacheco

Müller

Langer

et al. 2019

PeerJ

Self Cite

View full text Add to dashboard Cite

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 earliest predatory dinosaurs mostly relies on herrerasaurids recorded in Carnian strata of South America. Phylogenetic investigations recovered the clade in different positions within Dinosauria, whereas fewer studies challenged its monophyly. Although herrerasaurid fossils are much better recorded in present-day Argentina than in Brazil, Argentinean strata so far yielded no fairly complete skeleton representing a single individual. Here, we describe Gnathovorax cabreirai, a new herrerasaurid based on an exquisite specimen found as part of a multitaxic association form southern Brazil. The type specimen comprises a complete and well-preserved articulated skeleton, preserved in close association (side by side) with rhynchosaur and cynodont remains. Given its superb state of preservation and completeness, the new specimen sheds light into poorly understood aspects of the herrerasaurid anatomy, including endocranial soft tissues. The specimen also reinforces the monophyletic status of the group, and provides clues on the ecomorphology of the early carnivorous dinosaurs. Indeed, an ecomorphological analysis employing dental traits indicates that herrerasaurids occupy a particular area in the morphospace of faunivorous dinosaurs, which partially overlaps the area occupied by post-Carnian theropods. This indicates that herrerasaurid dinosaurs preceded the ecological role that later would be occupied by large to medium-sized theropods.

show abstract

Section: Resultsmentioning

confidence: 99%

Gnathovorax cabreirai: a new early dinosaur and the origin and initial radiation of predatory dinosaurs

Pacheco

Müller

Langer

et al. 2019

PeerJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although histological analyses were not performed to determine the ontogenetic stage of CAPPA/UFSM 0035, the presence of certain structures related to muscle attachment indicates that it belongs to a non‐juvenile individual—following the histologically investigated ontogenetic series of Asilisaurus kongwe (Griffin & Nesbitt, 2016). These structures are: (i) the anterolateral scar on the femoral head; (ii) the trochanteric shelf on the proximal portion of the femur; (iii) and the scar on the lateral surface of the postacebatular ala of the ilium (see Garcia et al, 2019). Furthermore, CAPPA/UFSM 0035 lacks the patches of longitudinal parallel striations on the external surface of limb bones, which occur in some skeletally immature dinosaurs (see Müller et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

The endocranial anatomy of Buriolestes schultzi (Dinosauria: Saurischia) and the early evolution of brain tissues in sauropodomorph dinosaurs

et al. 2020

Self Cite

View full text Add to dashboard Cite

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 poorly known, especially due to the lack of specimens preserving a complete and articulated neurocranium. This study helps to fill this gap by investigating the endocranial cavity of one of the earliest sauropodomorphs, Buriolestes schultzi, from the Upper Triassic (Carnian—c. 233 Ma) of Brazil. The endocranial anatomy of this animal sheds light on the ancestral condition of the brain of sauropodomorphs, revealing an elongated olfactory tract combined to a relatively small pituitary gland and well‐developed flocculus of the cerebellum. These traits change drastically across the evolutionary history of sauropodomorphs, reaching the opposite morphology in Jurassic times. Furthermore, we present here the first calculations of the Reptile Encephalization Quotient (REQ) for a Triassic dinosaur. The REQ of B. schultzi is lower than that of Jurassic theropods, but higher than that of later sauropodomorphs. The combination of cerebral, dental, and postcranial data suggest that B. schultzi was an active small predator, able to track moving prey.

show abstract

“…9A) that marks the origin of M. iliotibialis 3. The posterolateral surface of the postacetabular process, ventral to the dorsal ridge, bears an extensive muscle scar for the origin of M. flexor tibialis externus, also present in Saturnalia (Langer, 2003), Chromogisaurus (Ezcurra, 2010), and Buriolestes (Müller et al, 2018c) and previously considered an apomorphy of Saturnaliinae (Garcia et al, 2019). On the posterior part of the ilium, ventral to the postacetabular process, a shallow brevis fossa is present, anterodorsally bounded by a faintly defined the brevis shelf in lateral view (Fig.…”

Section: Appendicular Skeletonmentioning

confidence: 98%

Osteological redescription of the Late Triassic sauropodomorph dinosaur Thecodontosaurus antiquus based on new material from Tytherington, southwestern England

Ballell

Rayfield

Benton

2020

Journal of Vertebrate Paleontology

View full text Add to dashboard Cite

Thecodontosaurus antiquus is a basal sauropodomorph from the Rhaetian locality of Durdham Down in Bristol, U.K. Sauropodomorph material putatively assigned to this species was found at the nearby site of Tytherington. Here, we describe the Tytherington specimens and compare them with T. antiquus and other Late Triassic sauropodomorphs from Britain. We find that this material can be assigned to T. antiquus based on multiple shared morphological traits, and we provide a revised diagnosis of this taxon. The new anatomical information from the Tytherington specimens enriches the osteology of the species, particularly of previously unknown parts of the skeleton such as the skull. We find poor anatomical support to distinguish the contemporary Pantydraco caducus from T. antiquus, such that the former might represent a juvenile of the latter. We also discuss the questionable validity of Asylosaurus yalensis. Thecodontosaurus antiquus is one of the most basal sauropodomorphs that show craniodental traits related to herbivory, while retaining a plesiomorphic limb morphology and posture. This taxon was an important component of Rhaetian insular ecosystems of southwestern Britain.

show abstract

A dinosaur ilium from the Late Triassic of Brazil with comments on key-character supporting Saturnaliinae

Abstract: Late triassic of Brazil with comments on key-character supporting Saturnaliinae. An Acad Bras Cienc 91: e20180614.

Cited by 22 publications

References 53 publications

Gnathovorax cabreirai: a new early dinosaur and the origin and initial radiation of predatory dinosaurs

Gnathovorax cabreirai: a new early dinosaur and the origin and initial radiation of predatory dinosaurs

The endocranial anatomy of Buriolestes schultzi (Dinosauria: Saurischia) and the early evolution of brain tissues in sauropodomorph dinosaurs

Osteological redescription of the Late Triassic sauropodomorph dinosaur Thecodontosaurus antiquus based on new material from Tytherington, southwestern England

Contact Info

Product

Resources

About