| Phthinosuchus Temporal range: Middle Permian,
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|---|---|
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| Life restoration of Phthinosuchus discors | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Suborder: | †Dinocephalia (?) |
| Family: | †Phthinosuchidae Yefremov, 1954 |
| Genus: | †Phthinosuchus Yefremov, 1954 |
| Type species | |
| †Phthinosuchus discors Yefremov, 1954
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Phthinosuchus is an extinct genus of therapsids from the Middle Permian of Russia. Phthinosuchus is the sole member of the family Phthinosuchidae. Phthinosuchus may have been one of the most primitive therapsids, meaning that its ancestors may have branched off early from the main therapsid line.