Tartuosteus
| Tartuosteus Temporal range: | |
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| Genus: | Tartuosteus Obruchev, 1961 |
| Type species | |
| Psammolepis gigantea Gross, 1933 | |
Tartuosteus is an extinct genus of jawless fish from the Devonian of Eastern Europe. It is notable for its large size in comparison to other Ostracoderms, reaching a width of 1.5 m (4.9 ft).