Massetognathus
| Massetognathus Temporal range: early Late Triassic
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| Skeleton | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Family: | †Traversodontidae |
| Subfamily: | †Massetognathinae |
| Genus: | †Massetognathus Romer, 1967 |
| Type species | |
| †Massetognathus pascuali Romer, 1967
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| Species | |
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Massetognathus (/ˌmæsɪˈtɒɡnəθəs/ MASS-ə-TOG-nə-thəss; Greek for "chewing muscle jaw") is an extinct genus of plant-eating traversodontid cynodonts. They lived during the Triassic Period about 235 million years ago, and are known from the Chañares Formation in Argentina and the Santa Maria Formation in Brazil.