| Herasmius Temporal range: Devonian,
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| Life reconstruction of Herasmius granulatus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Suborder: | †Brachythoraci |
| Family: | †Heterosteidae |
| Genus: | †Herasmius Ørvig, 1969 |
| Species | |
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Herasmius is an extinct genus of heterosteid placoderm from the Devonian period. Fossils have been discovered freshwater deposits in Norway and Canada.