| Yinostius Temporal range: Early Devonian: Emsian,
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| Life reconstruction of Yinostius major | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Suborder: | †Brachythoraci |
| Family: | †Heterosteidae |
| Genus: | †Yinostius J. Wang & N. Wang, 1984 |
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| Synonyms | |
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Yinostius is an extinct genus of heterosteid placoderm of the Middle Devonian known from remains discovered in China.