| Gondwanax Temporal range: Middle–Upper Triassic,
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| Life restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia (?) |
| Family: | †Silesauridae |
| Clade: | †Sulcimentisauria |
| Genus: | †Gondwanax Müller, 2024 |
| Species: | †G. paraisensis
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| Binomial name | |
| †Gondwanax paraisensis Müller, 2024
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| Gondwanax type locality in Paraíso do Sul municipality, Brazil | |
Gondwanax (meaning "lord of Gondwana") is an extinct genus of silesaurid dinosauriform from the Triassic Pinheiros-Chiniquá Sequence of Brazil. The genus contains a single species, G. paraisensis, known from a partial skeleton. Gondwanax represents one of the oldest known dinosauromorphs, and, alongside the roughly coeval Gamatavus, one of the oldest South American silesaurs. While the possession of two sacral vertebrae characterizes more basal "silesaurid" taxa, Gondwanax has three—the oldest occurrence of this trait in the fossil record.[1]
- ^ Temp Müller, Rodrigo (2024). "A new "silesaurid" from the oldest dinosauromorph-bearing beds of South America provides insights into the early evolution of bird-line archosaurs". Gondwana Research. 137 (in press): 13–28. doi:10.1016/j.gr.2024.09.007.