Lajasvenator (meaning "Las Lajas hunter" after the city of Las Lajas in Neuquén, Argentina) is a genus of carcharodontosaurid dinosaur from the Mulichinco Formation from Neuquén Province in Argentina. The type and only species is Lajasvenator ascheriae. It was probably one of the smallest known allosauroids, being approximately only half the length of Concavenator, about 2.9 m (9.5 ft).[1]
| Lajasvenator Temporal range:
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|---|---|
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| Speculative life restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Carcharodontosauridae |
| Genus: | †Lajasvenator Coria et al., 2020 |
| Type species | |
| †Lajasvenator ascheriae Coria et al., 2020
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Lajasvenator is known from two specimens, MLL-PV-005 (the holotype) and MLL-PV-007 (a referred specimen). The referred specimen includes the proximal end of a cervical rib that is identical to the seventh cervical rib of the holotype. It is possible that the early evolutionary stage for the Carcharodontosauridae started with medium-sized predators like Lajasvenator that later diversified into the heavily-built taxa such as Giganotosaurus and Mapusaurus. Lajasvenator is the oldest carcharodontosaur known from the Cretaceous of South America and is a key taxon for understanding the clade's evolutionary history.[1]
Classification
editIn their 2020 description of Lajasvenator, Coria et al. found it to be a carcharodontosaurid in a clade with Eocarcharia and Concavenator.[1] In their description of Meraxes, Canale et al. (2022) recovered similar relationships, with Lajasvenator in a polytomy with Lusovenator, Eocarcharia, and Concavenator.[2]
In his 2024 review of theropod relationships, Andrea Cau recovered Lajasvenator as a carcharodontosaurid as the sister taxon to the clade formed by Labocania and Shaochilong.[3]
| Carcharodontosauridae |
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References
edit- ^ a b c Coria, Rodolfo A.; Currie, Philip J.; Ortega, Francisco; Baiano, Mattia A. (2020-07-01). "An Early Cretaceous, medium-sized carcharodontosaurid theropod (Dinosauria, Saurischia) from the Mulichinco Formation (upper Valanginian), Neuquén Province, Patagonia, Argentina". Cretaceous Research. 111: 104319. doi:10.1016/j.cretres.2019.104319. hdl:11336/122794. ISSN 0195-6671.
- ^ Canale, Juan I.; Apesteguía, Sebastián; Gallina, Pablo A.; Mitchell, Jonathan; Smith, Nathan D.; Cullen, Thomas M.; Shinya, Akiko; Haluza, Alejandro; Gianechini, Federico A.; Makovicky, Peter J. (July 2022). "New giant carnivorous dinosaur reveals convergent evolutionary trends in theropod arm reduction". Current Biology. 32 (14): 3195–3202.e5. doi:10.1016/j.cub.2022.05.057.
- ^ Cau, Andrea (2024). "A Unified Framework for Predatory Dinosaur Macroevolution" (PDF). Bollettino della Società Paleontologica Italiana. 63 (1): 1–19. doi:10.4435/BSPI.2024.08. ISSN 0375-7633.
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