Testing the persistence of Carcharodontosauridae (Theropoda) in the Upper Cretaceous of Patagonia based on dental evidence

Meso, J.G.; Valieri, Rubén D. Juárez; Porfiri, Juan D.; Correa, S.A.S.; Martinelli, Agustín G.; Casal, Gabriel; Poblete, Fernando; Santos, Domenica Dos

doi:10.1016/j.cretres.2021.104875

Cited by 13 publications

(7 citation statements)

References 78 publications

(88 reference statements)

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“…2020; Meso et al . 2021), which had been advocated only on the basis of isolated teeth (Martinelli & Forasiepi 2004; Veralli & Calvo 2004; Candeiro et al . 2006).…”

Section: Discussionmentioning

confidence: 99%

Elemgasem nubilus: a new brachyrostran abelisaurid (Theropoda, Ceratosauria) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina

Baiano

Pol

Bellardini

et al. 2022

Papers in Palaeontology

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Abelisaurids are medium-large-sized theropod dinosaurs that were predominant in the carnivorous fauna during the Late Cretaceous of Gondwana. These predators are abundant in the Cretaceous fossil strata of Patagonia, which yield the best record for this group. In the Late Cretaceous, abelisaurids appear in almost all regions of Gondwana and in all stages, except for the Coniacian, in which they are globally unknown. Here we describe a new abelisaurid, Elemgasem nubilus gen. et sp. nov., from the Portezuelo Formation (Turonian-Coniacian), Patagonia, Argentina. The palaeohistology of the appendicular bones of Elemgasem shows that the holotype was a subadult individual, but had achieved sexual maturity. This taxon is based on several axial and appendicular elements, and is diagnosed by the presence of a marked pattern of rugosity on the lateral surface of the fibula and a dorsoventrally deep lateral wall of the calcaneum. Moreover, the posterior caudal vertebrae have a morphology slightly different from any other abelisaurid. Elemgasem nubilus is recovered as an unstable taxon within Brachyrostra, given that it was recovered as sister taxon of Furileusauria or in several positions within this clade. Despite the problematic phylogenetic relationships of Elemgasem nubilus, it is important because it is the first abelisaurid from the Turonian-Coniacian interval and it increases the diversity of this theropod family at a time of marked turnover in the tetrapod fauna of South America, global climate change, and mass extinction events recorded worldwide in the marine realm.

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“…2020; Meso et al . 2021), which had been advocated only on the basis of isolated teeth (Martinelli & Forasiepi 2004; Veralli & Calvo 2004; Candeiro et al . 2006).…”

Section: Discussionmentioning

confidence: 99%

Elemgasem nubilus: a new brachyrostran abelisaurid (Theropoda, Ceratosauria) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina

Baiano

Pol

Bellardini

et al. 2022

Papers in Palaeontology

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“…Regarding to the dental synapomorphies recovered for Abelisauridae, these are numerous and highly diagnostic [17,22,36,37,39,40]. The case of Morphotype 4 is intriguing, as despite not demonstrating a robust a nity with a speci c subclade, it can be tentatively classi ed as an alvarezsaurid rather than an unenlaginae (see below).…”

Section: Cladistics and Multivariate Analysesmentioning

confidence: 99%

“…This great dataset includes eleven measurements (i.e., CBL, CBW, CH, AL, MCL, MCW, MCR, MSL, LAF, LIF, MDL, DDL), taken in 1374 teeth belonging to 91 taxa (86 species and ve indeterminate family-based taxa) separated into 20 monophyletic or paraphyletic groups [17,36]. As in previous studies (e.g., [17,37]), a second analysis was performed on a dataset restricted to rst-hand measurements by [22], since most researchers measure theropod crowns differently (see [22], for further information on this tendency). Considering that various teeth belong to relatively large-sized animals, a third analysis was carried out on a dataset restricted to theropod taxa with crowns of more than 20 mm.…”

Section: Discriminant Analysismentioning

confidence: 99%

Shed teeth from Portezuelo Formation at Sierra del Portezuelo reveal a higher diversity of predator theropods during Turonian-Coniacian times in northern Patagonia

Meso,

Gianechini,

Gomez

et al. 2024

Preprint

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The study of thirty-two shed crowns from the Portezuelo Formation (middle Turonian-late Coniacian) at the Sierra del Portezuelo locality, reveals six distinct tooth morphotypes identified through cladistic, discriminant, and cluster analyses. Two morphotypes were identified as belonging to Megaraptoridae, three to Abelisauridae, one to Abelisauroidea, and one to Alvarezsauridae. Additionally, two of the morphotypes exhibit a combination of dental features typically found in megaraptorid and abelisauridtheropods. These results suggest a greater diversity of theropods in the original ecosystem than previously thought, including the presence of a second morphotype of megaraptorid and alvarezsaurid previously undocumented in this formation. Furthermore, the existence of Morphotype 6 indicates the potential coexistence of medium-sized abelisauroids alongside larger abelisaurids in the same ecosystem. These findings underscore the importance of future expeditions to the Sierra del Portezuelo locality to further our understanding of these previously unknown theropod species.

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“…This great dataset includes eleven measurements (i.e., CBL, CBW, CH, AL, MCL, MCW, MCR, MSL, LAF, LIF, MDL, DDL), taken in 1374 teeth belonging to 91 taxa (86 species and five indeterminate family-based taxa) separated into 20 monophyletic or paraphyletic groups [19,38]. As in previous studies (e.g., [19,39]), a second analysis was performed on a dataset restricted to first-hand measurements by [24], since most researchers measure theropod crowns differently (see [24], for further information on this tendency). Considering that various teeth belong to relatively large-sized animals, a third analysis was carried out on a dataset restricted to theropod taxa with crowns of more than 20 mm.…”

Section: Discriminant Analysismentioning

confidence: 99%

Shed teeth from Portezuelo formation at Sierra del Portezuelo reveal a higher diversity of predator theropods during Turonian-Coniacian times in northern Patagonia

Meso,

Gianechini,

Gomez

et al. 2024

BMC Ecol Evo

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Testing the persistence of Carcharodontosauridae (Theropoda) in the Upper Cretaceous of Patagonia based on dental evidence

Cited by 13 publications

References 78 publications

Elemgasem nubilus: a new brachyrostran abelisaurid (Theropoda, Ceratosauria) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina

Elemgasem nubilus: a new brachyrostran abelisaurid (Theropoda, Ceratosauria) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina

Shed teeth from Portezuelo Formation at Sierra del Portezuelo reveal a higher diversity of predator theropods during Turonian-Coniacian times in northern Patagonia

Shed teeth from Portezuelo formation at Sierra del Portezuelo reveal a higher diversity of predator theropods during Turonian-Coniacian times in northern Patagonia

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