Niebla antiqua
| Niebla antiqua | |
|---|---|
| Life restoration | |
| Scientific classification Edit this classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Abelisauridae |
| Clade: | †Brachyrostra |
| Genus: | †Niebla Rolando et al., 2020 |
| Species: | †N. antiqua
|
| Binomial name | |
| †Niebla antiqua Rolando et al., 2020
| |
Niebla is a genus of abelisaurid theropod dinosaur from the Late Cretaceous Period (Campanian-Maastrichtian)[1] of Río Negro province, Argentina. The genus contains a single species, Niebla antiqua, and is known from a partial, non-articulated skeleton. The holotype, found in the Allen Formation, represents an adult individual about nine years old in minimum age.[2] [3]
Discovery and naming
[edit ]The holotype, MPCN-PV-796, was found near Matadero Hill, 70 kilometres (43 mi) south of General Roca, Río Negro province, Argentina. The fossil material includes a near-complete braincase, fragmentary jaw and teeth, relatively complete scapulocoracoid, dorsal ribs and incomplete vertebrae.[2]
The genus name Niebla comes from the Spanish word for "mist", referring to the foggy days during the excavation of the fossil. The specific name, antiqua, is derived from a Latin word meaning "old."[2]
Description
[edit ]Niebla represents one of the most derived abelisaurids. Despite its relatively small size, especially when compared to related dinosaurs like Carnotaurus , the holotype represents an adult. Based on the remains, Niebla would have been roughly 4–4.5 metres (13–15 ft) long.[2]
The scapulocoracoid is notably similar to that of Carnotaurus in having a posterodorsally oriented glenoid, a dorsoventrally expanded and wide coraco-scapular plate, and a very narrow and straight scapular blade. These features are very different from those of other abelisaurids, which may indicate a unique conformation of the pectoral girdle among these South American theropods.[2]
Paleoecology
[edit ]
Niebla is known from the Allen Formation of Argentina. The pterosaur Aerotitan , as well as many theropods (Quilmesaurus , Bonapartenykus , Austroraptor ), sauropods (Bonatitan , Aeolosaurus , Menucocelsior , Panamericansaurus , Pellegrinisaurus , Rocasaurus ), the possible nodosaurid ankylosaur Patagopelta , and ornithopods (Lapampasaurus , Kelumapusaura , Willinakaqe , and Bonapartesaurus ), are also known from the formation.[4] [5] [6] [7]
References
[edit ]- ^ Armas, Paula; Sánchez, María Lidia (2015), "Hybrid coastal edges in the Neuquén Basin (Allen Formation, Upper Cretaceous, Argentina)" (PDF), Andean Geology , 42: 97–113, retrieved 2018年10月02日
- ^ a b c d e Aranciaga Rolando, Mauro; Cerroni, Mauricio A.; Garcia Marsà, Jordi A.; Agnolín, Federico L.; Motta, Matías J.; Rozadilla, Sebastián; Brisson Eglí, Federico; Novas, Fernando E. (2020年10月14日). "A new medium-sized abelisaurid (Theropoda, Dinosauria) from the late cretaceous (Maastrichtian) Allen Formation of Northern Patagonia, Argentina". Journal of South American Earth Sciences. 105: 102915. doi:10.1016/j.jsames.2020.102915. hdl:11336/150468 . ISSN 0895-9811. S2CID 225123133.
- ^ Pol, Diego; Baiano, Mattia Antonio; Černý, David; Novas, Fernando; Cerda, Ignacio A.; Pittman, Michael (21 May 2024). "A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria". Cladistics. 40 (3): 307–356. doi:10.1111/cla.12583 . PMID 38771085.
- ^ "Allen Formation - Pteros".
- ^ Rolando MA, Garcia Marsà JA, Agnolín FL, Motta MJ, Rodazilla S, Novas FE (2022). "The sauropod record of Salitral Ojo del Agua: An Upper Cretaceous (Allen Formation) fossiliferous locality from northern Patagonia, Argentina". Cretaceous Research. 129: 105029. Bibcode:2022CrRes.12905029R. doi:10.1016/j.cretres.2021.105029. ISSN 0195-6671.
- ^ Riguetti, Facundo; Pereda-Suberbiola, Xabier; Ponce, Denis; Salgado, Leonardo; Apesteguía, Sebastián; Rozadilla, Sebastián; Arbour, Victoria (2022年12月31日). "A new small-bodied ankylosaurian dinosaur from the Upper Cretaceous of North Patagonia (Río Negro Province, Argentina)". Journal of Systematic Palaeontology. 20 (1): 2137441. Bibcode:2022JSPal..2037441R. doi:10.1080/14772019.2022.2137441. ISSN 1477-2019. S2CID 254212751.
- ^ Rozadilla, Sebastián; Brissón-Egli, Federico; Lisandro Agnolín, Federico; Aranciaga-Rolando, Alexis Mauro; Novas, Fernando Emilio (2022). "A new hadrosaurid (Dinosauria: Ornithischia) from the Late Cretaceous of northern Patagonia and the radiation of South American hadrosaurids". Journal of Systematic Palaeontology. 19 (17): 1207–1235. doi:10.1080/14772019.2021.2020917.
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