Guemesia (named after Martín Miguel de Güemes, whose death bicentenary was in 2021) is a genus of abelisaurid dinosaur from the Late Cretaceous Los Blanquitos Formation of Salta Province, Argentina. The type and only species is Guemesia ochoai, known from a nearly complete braincase. It is one of the smallest abelisaurids currently known.[1]
| Guemesia Temporal range: Late Cretaceous
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Abelisauridae |
| Genus: | †Guemesia Agnolín et al., 2022 |
| Species: | †G. ochoai
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| Binomial name | |
| †Guemesia ochoai Agnolín et al., 2022
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Discovery
editThe holotype of Guemesia, IBIGEO-P 103, is a small, nearly complete braincase. It was found in the Los Blanquitos Formation, in the Amblayo Valley of Salta Province, Argentina. The specimen was described in 2022 by Agnolín et al. as belonging to a new genus and species of abelisaurid dinosaur, and the first dinosaur of its kind known from the area.[1]
Classification
editAgnolín et al. place Guemesia as a derived abelisaurid within the clade Brachyrostra.[1]
Paleoecology
editGuemesia is known from the Los Blanquitos Formation. The controversial tetanuran theropod Unquillosaurus is also known from this formation,[2] as well as fossils of what may belong to a species of Titanosaurus.[3][1]
References
edit- ^ a b c d Agnolín, Federico L.; Cerroni, Mauricio A.; Scanferla, Agustín; Goswami, Anjali; Paulina-Carabajal, Ariana; Halliday, Thomas; Cuff, Andrew R.; Reuil, Santiago (2022-02-10). "First definitive abelisaurid theropod from the Late Cretaceous of Northwestern Argentina". Journal of Vertebrate Paleontology. 41 (4): e2002348. doi:10.1080/02724634.2021.2002348. ISSN 0272-4634. S2CID 246766133.
- ^ Powell, Jaime Eduardo (1979). "SOBRE UNA ASOCIACION DE DINOSAURIOS Y OTRAS EVIDENCIAS DE VERTEBRADOS DEL CRETACICO SUPERIOR DE LA REGION DE LA CANDELARIA, PROV. DE SALTA, ARGENTINA". Ameghiniana (in Spanish). 16 (1–2): 191–204. ISSN 1851-8044.
- ^ Arroyo El Morterito at Fossilworks.org