| Zenaspis Temporal range: | |
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| Fossil of Zenaspis powriei | |
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| Genus: | Zenaspis Lankester, 1869 |
| Type species | |
| Zenaspis salweyi | |
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Zenaspis is an extinct genus of osteostracan jawless fish which existed during the early Devonian period. Due to it being jawless, Zenaspis was probably a bottom feeder. Zenaspis was around 10 inches (25 cm) in length. It had a horseshoe shaped head that probably sheltered a small brain.
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