Styrjur (fræðiheiti: Acispenseriformes) eru ættbálkur innan undirflokksins brjóskgljáfiskar. Ættbálkurinn inniheldur tvær ættir, Styrjuætt (Acipenseridae) og Skóflustyrjuætt (Polyodontidae)[1].
| Styrjur | ||||||||||
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 Kanastyrja | ||||||||||
| Vísindaleg flokkun | ||||||||||
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| Ættir | ||||||||||
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Tenglar
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