| Janiosteus Temporal range: Middle Devonian: Givetian,
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Suborder: | †Brachythoraci |
| Family: | †Panxiosteidae |
| Genus: | †Janiosteus Ivanov, 1988 |
| Type species | |
| Janiosteus timanicus Ivanov, 1989
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Janiosteus is an extinct monospecific genus of placoderm arthrodire from the Middle Devonian: Late Givetian stage found in Timan, Russia.