| Aleosteus Temporal range: Early Devonian: Late Emsian,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Genus: | †Aleosteus Johnson et al., 2000 |
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Aleosteus is an extinct monospecific genus of arthrodire placoderm fish of the Early Devonian period. The type species Aleosteus eganensis was described in 2000, and was found in the Late Emsian strate of the Sevy Dolomite Formation, in the Egan Range of east-central Nevada, USA. Almost complete fossils belong to juvenile and adult specimens and show a short and broad skull, posteriorly concave.[1]
- ^ Johnson, H.G.; Elliot, David; Wittke, James (2000). "A new actinolepid arthrodire (Class Placodermi) from the lower Devonian Sevy Dolomite, East-Centrai Nevada". Zoological Journal of the Linnean Society. 129: 241–266. doi:10.1006/zjls.1999.0206.