Asterosteus is a genus of rhenanid placoderm from the Eifelian.

The type species, A. stenocephalus, is known from an incomplete skull from Middle Devonian strata in Ohio.

What may be a second species ("Asterosteus sp Schmidtt 1963") is described from fragments decorated with star-shaped tubercules from the Eifelian-aged Gebze beds of Turkey.

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