On a dinosaur axis from one of the oldest dinosaur-bearing sites worldwide

Müller, Rodrigo Temp; Pretto, Flávio Augusto; Stefanello, Micheli; Silva-Neves, Eduardo; Dias‐da‐Silva, Sérgio

doi:10.4202/app.00369.2017

Cited by 6 publications

(9 citation statements)

References 21 publications

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“…Indeed, it lacks several muscle attachment structures that are present in the femora of both ULBRA-PVT280 and CAPPA/UFSM 0035, suggesting that it represents a less mature individual than the others. CAPPA/UFSM 0179 corresponds to an isolated axis (Müller et al, 2017). Its morphology resembles that of CAPPA/UFSM 0035, but it is 12% larger, corresponding to the largest dinosaur from the Buriol outcrop.…”

Section: Buriolestes Schultzi Inclusivity and Distinction From Coevalmentioning

confidence: 92%

“…2). The presence of specimens ascribed to the rhynchosaur Hyperodapedon (Dias-da-Silva, Cabreira & Roberto-da-Silva, 2011;Roberto-da-Silva et al, 2014;Müller et al, 2017) allows the correlation with the Ischigualasto Formation, in northwest Argentina, radioisotopically dated as 231.4 ± 0.3 Mya (Martínez et al, 2011). In addition to B. schultzi and Hyperodapedon sp., the Buriol outcrop has also yielded the lagepetid Ixalerpeton polesinensis (Cabreira et al, 2016), whereas fishes (dipnoi plate, hybodontiform shark spine and actinopterygian remains), aetosaurs, temnospondyls and cynodonts were found in close surrounding outcrops (Perez & Malabarba, 2002;Toledo & Bertini, 2005;Richter & Toledo, 2008;Dias-da-Silva et al, 2011, 2012Roberto-da-Silva et al, 2014;Pacheco et al, 2017).…”

Section: Locality and Horizonmentioning

confidence: 99%

“…A, CAPPA/UFSM 0035 in the rock block before the final preparation. B, map of the São João do Polêsine area, Rio Grande do Sul, Brazil, showing the location of the Buriol outcrop (modified from Müller et al, 2017). C, reconstruction of the preserved portions of the skeleton of CAPPA/UFSM 0035.…”

Section: Locality and Horizonmentioning

confidence: 99%

“…Reig, 1963;Casamiquela, 1967;Colbert, 1970;Sereno et al, 1993;Cabreira et al, 2016), mainly represented by the Santa Maria Supersequence and the Ischigualasto Formation, respectively from Brazil and Argentina (but see Nesbitt et al, 2012;Baron, Norman & Barrett, 2017a). These units yield Saurischian dinosaurs, represented by several well-preserved herrerasaurids (Reig, 1963;Colbert, 1970;Alcober & Martínez, 2010), sauropodomorphs (Sereno et al, 1993;Langer et al, 1999;Martínez & Alcober, 2009;Ezcurra, 2010;Cabreira et al, 2011Cabreira et al, , 2016 and possible theropods (Martínez et al, 2011;Müller et al, 2017). In contrast, ornithischians are poorly known, so far represented only by Pisanosaurus mertii (Casamiquela, 1967).…”

Section: Introductionmentioning

confidence: 99%

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Early evolution of sauropodomorphs: anatomy and phylogenetic relationships of a remarkably well-preserved dinosaur from the Upper Triassic of southern Brazil

Müller

Langer

Bronzati

et al. 2018

Zoological Journal of the Linnean Society

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111

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An exceptional new specimen (CAPPA/UFSM 0035) of Buriolestes schultzi was discovered during recent fieldwork at the type locality of the taxon, which is Carnian in age (Late Triassic). This early sauropodomorph is peculiar owing to its faunivorous feeding habits, unusual amongst the members of this large omnivorous/herbivorous clade. The specimen incorporates new data on skeletal portions that have so far been unknown for B. schultzi, particularly regarding the skull and axial skeleton. As such, B. schultzi is now as complete as the best-known early dinosaurs, such as Eoraptor lunensis and Herrerasaurus ischigualastensis. A phylogenetic investigation fully supports B. schultzi as a sauropodomorph, corroborating the previous assignation. Despite the presence of traits found in Theropoda, distinct skeletal portions of B. schultzi do not share its morphospace in a morphological disparity analysis. We also propose an alternative evolutionary scenario for the first members of Sauropodomorpha: some Carnian taxa from South America form a monophyletic group instead of a series of low-diversity lineages paraphyletic with respect to Plateosauria.

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Section: Buriolestes Schultzi Inclusivity and Distinction From Coevalmentioning

confidence: 92%

Section: Locality and Horizonmentioning

confidence: 99%

Section: Locality and Horizonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early evolution of sauropodomorphs: anatomy and phylogenetic relationships of a remarkably well-preserved dinosaur from the Upper Triassic of southern Brazil

Müller

Langer

Bronzati

et al. 2018

Zoological Journal of the Linnean Society

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111

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“…But, since most reported Edmontosaurus bonebeds are composed of disarticulated elements [3,6,9,46,53] it is difficult to generalize. Limited preservation of axial elements is a widespread phenomenon [54]. Head, neck, hand and foot bones, and distal caudal vertebrae appear to have disarticulated most readily in this species.…”

Section: Plos Onementioning

confidence: 84%

Over 13,000 elements from a single bonebed help elucidate disarticulation and transport of an Edmontosaurus thanatocoenosis

Snyder¹,

McLain²,

Wood³

et al. 2020

PLoS ONE

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Over twenty years of work on the Hanson Ranch (HR) Bonebed in the Lance Formation of eastern Wyoming has yielded over 13,000 individual elements primarily of the hadrosaurid dinosaur Edmontosaurus annectens. The fossil bones are found normally-graded within a fine-grained (claystone to siltstone) bed that varies from one to two meters in thickness. Almost all specimens exhibit exquisite preservation (i.e., little to no abrasion, weathering, and breakage), but they are disarticulated which, combined with our sedimentological observations, suggests that the bones were remobilized and buried after a period of initial decay and disarticulation of Edmontosaurus carcasses. Because of the large number of recovered fossil elements, we have been able to gain deeper insight into Edmontosaurus biostratigraphy including disarticulation and transport of skeletal elements. The most common postcranial elements in the bonebed are pubes, ischia, scapulae, ribs, and limb bones. By contrast, vertebrae, ilia, and chevrons are rare. The most common craniomandibular bones include dentaries, nasals, quadrates, and jugals, whereas the premaxillae, predentaries, and braincase bones are underrepresented. Thus, overall, chondrocranial and axial elements, as well as distal elements of the limbs, are distinctly underrepresented. We hypothesize that following decay and disarticulation, hydraulic winnowing removed the articulated sections (e.g., vertebral columns) and the small, distal-most elements before, or at the same time, the remaining bones were swept up in a subaqueous debris flow that generated the deposit. Comparison of the HR Bonebed with other widely dispersed Upper Cretaceous hadrosaurid-dominated bonebeds reveals many shared attributes, which suggests similar processes at work in the formation of these bonebeds across space and time. This in turn reflects similar behavior by populations of these species around the world resulting in similar modes of death, becoming interred in similar depositional settings.

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A saurischian (Archosauria, Dinosauria) ilium from the Upper Triassic of southern Brazil and the rise of Herrerasauria

Garcia,

Cabreira,

da Silva

et al. 2023

The Anatomical Record

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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 well‐preserved left ilium. A thorough examination of the specimen's anatomy and a phylogenetic analysis provides evidence that CAPPA/UFSM 0373 belongs to the Herrerasauria. We were able to identify several similarities with potential non‐herrerasaurid herrerasaurians (e.g., Tawa hallae, “Caseosaurus crosbyensis”), which were previously only known from North American deposits. In contrast, herrerasaurids (e.g., Herrerasaurus ischigualastensis) are almost exclusively known from South America. Our results support the nesting of CAPPA/UFSM 0373 as an early‐diverging herrerasaurian. Furthermore, this is potentially the first record of a non‐herrerasaurid herrerasaurian in unambiguous Carnian beds, suggesting a hidden diversity of dinosaurs in the Carnian rocks of the Candelária Sequence, which can be revealed even by fragmentary specimens.

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On a dinosaur axis from one of the oldest dinosaur-bearing sites worldwide

Abstract: 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

Cited by 6 publications

References 21 publications

Early evolution of sauropodomorphs: anatomy and phylogenetic relationships of a remarkably well-preserved dinosaur from the Upper Triassic of southern Brazil

Early evolution of sauropodomorphs: anatomy and phylogenetic relationships of a remarkably well-preserved dinosaur from the Upper Triassic of southern Brazil

Over 13,000 elements from a single bonebed help elucidate disarticulation and transport of an Edmontosaurus thanatocoenosis

A saurischian (Archosauria, Dinosauria) ilium from the Upper Triassic of southern Brazil and the rise of Herrerasauria

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