First record of abelisaurid theropods and a peirosaurid crocodyliform from the Upper Cretaceous of Precordillera of La Rioja, NW Argentina

Juarez, Malena; Hechenleitner, E. Martín; Martinelli, Agustín G.; Rocher, Sebastián; Fiorelli, Lucas E.

doi:10.1016/j.cretres.2023.105679

Cited by 4 publications

(4 citation statements)

References 39 publications

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“…In any case, Morphotype 1 implies the existence of a new megaraptorid for the locality and formation. Morphotypes 3 and 5 display features consistent with both the mesial and lateral dentition of abelisaurid teeth, a observation elucidated in previous studies [24,38,42,43]. Morphotype 6, despite being an incomplete crown, is notable for a distinctive feature-the number of denticles per 5 mm.…”

Section: Morphological Comparison Of the Teeth From Sierra Del Portez...supporting

confidence: 77%

“…Regarding synapomorphies that recovered Morphotypes 3, 5, and 6 as abelisaurids are: 1) a salinon to J-shaped cross-section outline at the crown base, in mesial teeth; 2) similar or lower number of denticles at the apex than at mid-crown; 3) strongly developed interdenticular sulci; 4) well-visible marginal undulations; 5) an irregular enamel surface texture; 6 and 7) crowns that are short and strongly compressed, indicated by a CBR (Crown Base Ratio) of less than 0.5 and a CHR (Crown Height Ratio) of less than 2; 8) a mesial carina extending towards the cervix; 9) a distal carina centrally positioned on the distal margin of the crown; 10) elongated interdenticular sulci; 11) An irregular enamel surface texture. Characters 1-5 are some of those always recovered as synapomorphies in previous papers when mesial teeth (e.g., [19,24,38,42,43]). Similar to mesial teeth, characters 6-11 have also been identified as synapomorphies for the lateral dentition of abelisaurids [19,22,24,38,43].…”

Section: Cladistics and Multivariate Analysesmentioning

confidence: 78%

“…Characters 1-5 are some of those always recovered as synapomorphies in previous papers when mesial teeth (e.g., [19,24,38,42,43]). Similar to mesial teeth, characters 6-11 have also been identified as synapomorphies for the lateral dentition of abelisaurids [19,22,24,38,43].…”

Section: Cladistics and Multivariate Analysesmentioning

confidence: 78%

“…This divergence is likely attributed to specific characteristics, which will be addressed in subsequent discussions (see below). Regarding to the dental synapomorphies recovered for Abelisauridae, these are numerous and highly diagnostic [19,24,38,39,42,43]. The case of Morphotype 4 is intriguing, as despite not demonstrating a robust affinity with a specific subclade, it can be tentatively classified as an alvarezsaurid rather than an unenlaginae (see below).…”

Section: Cladistics and Multivariate Analysesmentioning

confidence: 99%

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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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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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Section: Morphological Comparison Of the Teeth From Sierra Del Portez...supporting

confidence: 77%

Section: Cladistics and Multivariate Analysesmentioning

confidence: 78%

Section: Cladistics and Multivariate Analysesmentioning

confidence: 78%

Section: Cladistics and Multivariate Analysesmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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Theropod dinosaur diversity of the lower English Wealden: analysis of a tooth‐based fauna from the Wadhurst Clay Formation (Lower Cretaceous: Valanginian) via phylogenetic, discriminant and machine learning methods

Barker,

Handford,

Naish

et al. 2024

Papers in Palaeontology

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The Lower Cretaceous Wealden Supergroup of southern England yields a diverse assemblage of theropod dinosaurs, its taxa being represented by fragments in addition to some of the most informative associated skeletons of the European Mesozoic. Spinosaurids, neovenatorid allosauroids, tyrannosauroids and dromaeosaurids are among reported Wealden Supergroup clades. However, the majority of relevant specimens are from the Barremian Upper Weald Clay and Wessex formations, and theropod diversity in the older Berriasian–Valanginian Hastings Group has remained poorly known, the fragmentary specimens reported thus far remaining enigmatic both in terms of phylogenetic affinities and sometimes provenance. A better understanding would be welcome given the paucity of Berriasian–Valanginian dinosaurs worldwide. Here, we describe an assemblage of Hastings Group theropod teeth from the Valanginian Wadhurst Clay Formation, mostly collected from the Ashdown Brickworks locality near Bexhill, East Sussex. These teeth were assessed using phylogenetic, discriminant and machine learning analyses and were found to include members of Spinosauridae, Tyrannosauroidea and Dromaeosauridae, in addition to others that remain of uncertain affinity within Coelurosauria. The taxa appear distinct from those already known from Wealden Supergroup strata: the spinosaurid cannot be referred to Baryonyx or the tyrannosauroid to Eotyrannus, for example, but we have not named new taxa at this time. Combined with other findings in the Wadhurst Clay Formation, our study indicates that Valanginian theropod diversity was comparable to that of younger Wealden Supergroup units, implying that the ‘characteristic’ theropod components of Wealden faunas were established early in the deposition of this famous geological succession.

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Theropod teeth from the Upper Cretaceous of central Spain: Assessing the paleobiogeographic history of European abelisaurids

Malafaia,

Escaso,

Coria

et al. 2025

Cretaceous Research

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First record of abelisaurid theropods and a peirosaurid crocodyliform from the Upper Cretaceous of Precordillera of La Rioja, NW Argentina

Cited by 4 publications

References 39 publications

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

Theropod dinosaur diversity of the lower English Wealden: analysis of a tooth‐based fauna from the Wadhurst Clay Formation (Lower Cretaceous: Valanginian) via phylogenetic, discriminant and machine learning methods

Theropod teeth from the Upper Cretaceous of central Spain: Assessing the paleobiogeographic history of European abelisaurids

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