Aleosteus

Aleosteus Fossil range: Late Devonian
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Subdivision:	A. eganensis (Johnson et al., 1998) (type)
Class:	Placodermi
Order:	Arthrodira
Family:	Actinolepidae
Genus:	Aleosteus

Aleosteus ("dice-shaped bone") is an extinct genus of arthrodire placoderm. Its fossils have been found in 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.