A new small-bodied ankylosaurian dinosaur from the Upper Cretaceous of North Patagonia (Río Negro Province, Argentina)

Riguetti, Facundo; Suberbiola, Xabier Pereda; Ponce, Denis A.; Salgado, Leonardo; Apesteguı́a, Sebastián; Rozadilla, Sebastián; Arbour, Victoria M.

doi:10.1080/14772019.2022.2137441

Cited by 12 publications

(3 citation statements)

References 116 publications

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“…Mammals of North American origin were already diverse in the earliest Paleocene of South America, suggesting they must have crossed over earlier (67, 68). However, actual fossil evidence of exchanges during the latest Cretaceous is only provided by dinosaurs: the Austrokritosauria and the patagonian nodosaurid Patagopelta had North American ancestors (4, 69), while large titanosaurs in North America likely had ancestors in South America (70, 71).…”

Section: Discussionmentioning

confidence: 99%

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

Alarcón-Muñoz

Vargas

Püschel

et al. 2023

Preprint

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In the dusk of the dinosaur era, the advanced duck-billed dinosaurs (Family Hadrosauridae) are thought to have outcompeted other herbivores, making ecosystems less diverse and more vulnerable to the Cretaceous-Paleogene asteroid impact. They were also among the first terrestrial organisms to disperse from North America into South America. Here, we present the first new species of subantarctic duck-billed dinosaur, CPAP 3054, of early Maastrichtian age in Magallanes, Chile. Surprisingly, unlike duckbills further north in Patagonia, CPAP 3054 is not an advanced duckbill, but descends from North American forms that were transitional to Hadrosauridae, diverging shortly before the origin of this family. In North America, these forms were replaced by hadrosaurids in the late Campanian. The survival into the Maastrichtian of a pre-hadrosaurid lineage suggests the ancestors of CPAP 3054 arrived earlier in South America than the hadrosaurids, reaching further south before the Cretaceous-Paleogene mass extinction, where they avoided competition from hadrosaurids.Additional noteThis work contains a new biological name. New names in preprints are not considered available by the ICZN. To avoid ambiguity, the new biological name is not included in this preprint, and the holotype specimen number CPAP 3054 is used as a placeholder. Paratypes described in this preprint are also used in the diagnosis.

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Section: Discussionmentioning

confidence: 99%

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

Alarcón-Muñoz

Vargas

Püschel

et al. 2023

Preprint

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“…Mammals of North American origin had already become diverse in South America in the early Paleocene, suggesting that they must have crossed over earlier: However, no remains have yet been found in the Cretaceous of South America ( 53 , 54 ). Currently, the most reliable fossil evidence of exchanges during the Cretaceous is provided by the Austrokritosauria, with other evidence also provided by Patagopelta , a possible nodosaurid from Patagonia ( 4 , 55 ), and the large North American titanosaur Alamosaurus , with potential ancestry in South America ( 56 , 57 ). Therefore, if the ancestors of Gonkoken were from North America, they could have followed a similar route.…”

Section: Discussionmentioning

confidence: 99%

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

et al. 2023

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In the dusk of the Mesozoic, advanced duck-billed dinosaurs (Hadrosauridae) were so successful that they likely outcompeted other herbivores, contributing to declines in dinosaur diversity. From Laurasia, hadrosaurids dispersed widely, colonizing Africa, South America, and, allegedly, Antarctica. Here, we present the first species of a duck-billed dinosaur from a subantarctic region, Gonkoken nanoi , of early Maastrichtian age in Magallanes, Chile. Unlike duckbills further north in Patagonia, Gonkoken descends from North American forms diverging shortly before the origin of Hadrosauridae. However, at the time, non-hadrosaurids in North America had become replaced by hadrosaurids. We propose that the ancestors of Gonkoken arrived earlier in South America and reached further south, into regions where hadrosaurids never arrived: All alleged subantarctic and Antarctic remains of hadrosaurids could belong to non-hadrosaurid duckbills like Gonkoken . Dinosaur faunas of the world underwent qualitatively different changes before the Cretaceous-Paleogene asteroid impact, which should be considered when discussing their possible vulnerability.

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“…The ankylosaurian phylogeny remains unstable. Numerical cladistic analyses over the last three decades have generated various hypotheses of interrelationships (Kirkland 1998 2005; Thompson et al 2012;Han et al 2014;Wiersma and Irmis 2018;Norman 2021;Soto-Acuña et al 2021;Yao et al 2022;Riguetti et al 2022bRiguetti et al , 2022aRaven et al 2023), but in recent times these datasets converged onto the three independent lines of research rooted in Arbour and Currie (2016), Wiersma and Irmis (2018) and Raven et al (2023). The common feature between them is that the ankylosaurian relationships are so unstable that, in these maximum parsimony analyses, consensus is typically obtained by majority rule.…”

Section: Phylogenetic Analysesmentioning

confidence: 99%

A new armored dinosaur with double cheek horns from the early Late Cretaceous of southeastern China

Xing,

Niu,

Mallon

et al. 2024

Vert. Anat. Morph. Palaeo.

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Ankylosaurines are the iconic armoured dinosaurs that characterize terrestrial vertebrate faunas in the Late Cretaceous of Asia and Laramidia (western North America). The earliest members of this clade are known from the early Late Cretaceous (Cenomanian–Santonian) times of Asia, but little consensus has emerged as to how they are related to the anatomically derived and chronologically younger forms. In southeastern China, the Cretaceous red sand beds crop out across basins from Zhejiang to Guandong provinces. However, the horizons corresponding to the early Late Cretaceous stages remain poorly sampled. Here, we report the first definitive vertebrate skeleton ¾ let alone that of an armoured dinosaur ¾ from the Coniacian/Turonian Ganzhou Formation, Datai yinliangis gen. et sp. nov. Despite the immature ontogenetic status of the type materials, D. yingliangis can be diagnosed with autapomorphic traits in the cranial caputegulae (such as double horns on the quadratojugal) and extensive gular osteoderms. Morphologically, it is intermediate between the chronologically older ankylosaurids from Asia (e.g., Crichtonpelta and Jinyunpelta) and derived post-Cenomanian ankylosaurines (e.g., Pinacosaurus). Phylogenetic analyses broadly corroborate this assessment. The new taxon either falls in the grade of Asian ankylosaurines proximal to the lineages of derived forms or forms a sister lineage to Pinacosaurus. Based on these insights, Datai makes a significant addition to the early Late Cretaceous vertebrate fauna from southeastern China and highlights the future potential in this region for improved understanding of the origin and early evolution of ankylosaurines.

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A new small-bodied ankylosaurian dinosaur from the Upper Cretaceous of North Patagonia (Río Negro Province, Argentina)

Cited by 12 publications

References 116 publications

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

A new armored dinosaur with double cheek horns from the early Late Cretaceous of southeastern China

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