Mesacanthus
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| Mesacanthus Temporal range: Early Devonian |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Acanthodii |
| Genus: | Mesacanthus |
Mesacanthus ('middle spine') is an extinct genus of acanthodian fish from early Devonian Scotland. It is among the more primitive of the early Devonian acanthodians.
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