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Temporal range: Late Emsian
Aleosteus eganensis.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Placodermi
Order: Arthrodira
Family: Actinolepidae
Genus: Aleosteus
Johnson et al., 2000
  • A. eganensis (Johnson et al., 2000) (type)

Aleosteus eganensis is an extinct arthrodire placoderm fish. Its fossils have been 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.