Non-sauropodiform Plateosaurians: Milestones Through the “Prosauropod” Bauplan

Otero, Alejandro; Fabrègues, Claire Peyre de

doi:10.1007/978-3-030-95959-3_2

Cited by 1 publication

(2 citation statements)

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“…The fossil record of sauropodomorphs from the Caturrita Formation is particularly crucial because these forms represent the first step toward the acquisition of the typical “sauropodomorph body plan”, characterized by reduced skulls, plant‐eating teeth, elongated necks, and stout limbs (Leal et al, 2004; Müller et al, 2018; Otero & Peyre de Fabrègues, 2022). Whereas G. candelariensis and M. itaquii are known by a series of specimens, U. tolentinoi is poorly sampled.…”

Section: Introductionmentioning

confidence: 99%

“…The origin and early radiation of sauropodomorph dinosaurs have been exhaustively investigated during the last decade (Langer et al, 2022; Novas et al, 2021; Otero & Peyre de Fabrègues, 2022; Pol et al, 2021). The evolution of the body plan during the Triassic Period has received great attention (Ballell, Rayfield, & Benton, 2022; Bronzati et al, 2019; Cabreira et al, 2016; Damke et al, 2024; McPhee et al, 2018; Müller et al, 2018), especially regarding the acquisition of typical traits related to gigantism (Apaldetti et al, 2018; Lefebvre et al, 2022; Peyre de Fabrègues & Allain, 2020).…”

Section: Introductionmentioning

confidence: 99%

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On a skeletally immature individual of Unaysaurus tolentinoi (Dinosauria: Sauropodomorpha) from the upper Triassic of southern Brazil

Müller,

Garcia,

Bem

et al. 2023

The Anatomical Record

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The lineage of sauropodomorph dinosaurs raised some of the most impressive animals that ever walked on Earth. However, the massive titans of the Mesozoic Era originated from far smaller dinosaurs. The Triassic beds from Brazil yielded the earliest part of this evolutionary history. Despite the diverse fossil record of early sauropodomorphs, juvenile specimens, as well as certain species are poorly sampled. This is the case for Unaysaurus tolentinoi, an unaysaurid sauropodomorph from Caturrita Formation (ca. 225 Ma; early Norian, Late Triassic). The holotype and only specimen of U. tolentinoi was excavated from the Água Negra Locality (São Martinho da Serra, Rio Grande do Sul, Brazil) in 1998. More than two decades later, no other fossil vertebrates have been reported from the same fossiliferous site. Here we describe a skeletally immature specimen which was found in association with the holotype of U. tolentinoi. The specimen was discovered after a first‐hand examination of the holotype and comprises some isolated vertebrae and elements from the posterior autopodium. According to linear regressions, its metatarsal I is approximately 41.7 mm in length, compared to approximately 75.9 mm in the holotype. The repeated elements and reduced size indicates that it does not belong to the elements originally used to erect U. tolentinoi. Rather, the specimen is assigned to U. tolentinoi by topotypy and shared morphology. In addition to the reduced size, distinct lines of evidence (e.g., neurocentral sutures; bone texture) support its assignment to a skeletally immature individual. In sum, the new material expands the record of U. tolentinoi, and represents an additional juvenile dinosaur from the Caturrita Formation.

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Section: Introductionmentioning

confidence: 99%