Primer Registro de Displasia Coxofemoral en un Rincosaurio Del Triásico Superior

Trotteyn, M. Jimena; Martínez, Ricardo N.

doi:10.5710/amgh.18.11.2011.551

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…Multiple fieldwork seasons have resulted in the collection of more than 450 rhynchosaur specimens from the Scaphonyx-Exaeretodon-Herrerasaurus biozone of the Ischigualasto Formation in the Ischigualasto Provincial Park during the last 35 years (Martínez et al, 2011(Martínez et al, , 2013. These rhynchosaur specimens have been referred to 'Scaphonyx' sanjuanensis (= Hyperodapedon sanjuanensis), but without a specific morphological justification (e.g., Martínez et al, 2013;Trotteyn and Martínez, 2013). Despite the abundance of specimens, until very recently, no additional work on the anatomy of Hyperodapedon sanjuanensis has been conducted after the original description of Sill (1970), with the exception of sporadic, short contributions focused on intraspecific variation (Contreras and Bracco, 1989;Bracco and Contreras, 1990) or palaeopathology (Trotteyn and Martínez, 2013).…”

Section: The Argentinian Recordmentioning

confidence: 99%

“…These rhynchosaur specimens have been referred to 'Scaphonyx' sanjuanensis (= Hyperodapedon sanjuanensis), but without a specific morphological justification (e.g., Martínez et al, 2013;Trotteyn and Martínez, 2013). Despite the abundance of specimens, until very recently, no additional work on the anatomy of Hyperodapedon sanjuanensis has been conducted after the original description of Sill (1970), with the exception of sporadic, short contributions focused on intraspecific variation (Contreras and Bracco, 1989;Bracco and Contreras, 1990) or palaeopathology (Trotteyn and Martínez, 2013). Gentil and Ezcurra (2018) used a computed tomography scan to digitally reconstruct the dentition of the holotype of Hyperodapedon sanjuanensis, which was not available to previous researchers because it is mostly hidden by the full occlusion between the maxillae and dentaries in the real specimen.…”

Section: The Argentinian Recordmentioning

confidence: 99%

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The stem-archosaur evolutionary radiation in South America

Ezcurra

Montefeltro

Pinheiro

et al. 2021

Journal of South American Earth Sciences

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The oldest archosauromorphs (dinosaurs, birds, crocodiles, and their stem-taxa) are recorded in middle− upper Permian rocks, but it was not after the Permo− Triassic mass extinction that the group shows a substantially high taxonomic richness and ecomorphological disparity. The early evolutionary history of the Archosauromorpha during the Early and Middle Triassic is mainly based on fossils recovered from rocks in southern Africa, Europe and Asia, whereas South America possesses a more complete fossil record of the group only in the Late Triassic.Here we revisit, discuss, and reanalyse the non-archosaurian archosauromorph fossil record of the current-day South America. The Early Triassic archosauromorph record in this continent is still scarce, but it documents the early evolution of the group in western Pangaea and is crucial to understand more globally the biotic recovery after the Permo− Triassic mass extinction. The Middle Triassic record is extremely scarce, but the Late Triassic archosauromorph assemblage of South America is among the most diverse and abundant worldwide. The last decade has witnessed a considerable improvement in our knowledge of the record, taxonomy, phylogeny, and macroevolution of the group with the input from the South American fossils. Nevertheless, a considerable amount of research is needed and ideally should be focused on some particular aspects of the Triassic evolutionary radiation of Archosauromorpha. Among them, the Early Triassic record should be expanded, more numerous and more complete Middle Triassic archosauromorph specimens are crucial to have a more complete picture of the evolution of the group, and the taxonomy of groups like proterochampsids and hyperodapedontine rhynchosaurs should be clarified through detailed anatomical work.

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Section: The Argentinian Recordmentioning

confidence: 99%

Section: The Argentinian Recordmentioning

confidence: 99%

The stem-archosaur evolutionary radiation in South America

Ezcurra

Montefeltro

Pinheiro

et al. 2021

Journal of South American Earth Sciences

Self Cite

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“…However, despite the holotype of H. sanjuanensis being very informative and this species so well represented in the Ischigualasto Formation, its anatomy is barely known. Anatomical information about H. ischigualastensis is restricted to a brief account in the original description of the species (Sill, 1970), a short contribution focused on ontogenetic changes (Contreras & Bracco, 1989), a postcranial paleopathology (Trotteyn & Martínez, 2013), and a tridimensional reconstruction of the masticatory apparatus of the holotype (Gentil & Ezcurra, 2018). The lack of detailed, updated anatomical information of H. sanjuanensis complicates discussions about the taxonomy of South American rhynchosaurs as a whole, as well as the phylogenetic relationships within Hyperodapedontinae (Ezcurra et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Skull osteology of the holotype of the rhynchosaur Hyperodapedon sanjuanensis (Sill, 1970) from the Upper Triassic Ischigualasto Formation of Argentina

Gentil

Ezcurra

2021

The Anatomical Record

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Rhynchosaurs are bulky quadrupedal herbivores that achieved a cosmopolitan distribution during the Middle and Late Triassic. Rhynchosaurids are characterized by a pair of premaxillae modified into an edentulous beak that had a bone‐to‐bone occlusion with the tips of the dentaries, and a specialized masticatory apparatus composed of groove(s) on the maxilla and ridges(s) on the dentary. The Argentinian fossil record of rhynchosaurs is abundant, but only two nominal species have been named so far. One of them, the hyperodapedontine Hyperodapedon sanjuanensis, is the most abundant tetrapod of the Ischigualasto Formation of northwestern Argentina. However, the anatomy of H. sanjuanensis remains poorly studied. The repreparation and computed tomographic (CT) scanning of its holotypic skull (MACN‐Pv 18185) allowed a detailed description of its anatomy. Among the novel anatomical data presented here, we provide the first tridimensional complete reconstruction of a rhynchosaurid palate. This structure is extremely complex in comparison to the plesiomorphic archosauromorph condition, and more data on other rhynchosaurid palates are needed to shed light on the sequence of character states acquisition that resulted in this peculiar anatomy. The presence of a pair of septomaxillae in H. sanjuanensis is the first report of these bones in a rhynchosaurid, and this new information allowed to identify septomaxillae also in the hyperodapedontines Teyumbaita sulcognathus and Hyperodapedon mariensis. The better understanding of the skull anatomy of the holotype of H. sanjuanensis is a first step towards an improved knowledge of the morphology and taxonomy of the South American rhynchosaurs.

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