Genus: Asterosteus NEWBERRY, 1875
Etymology:

Specis: stenocephalus NEWBERRY, 1875
Etymology:

Cotype: AMNH 314

Locality: Delaware, Delaware County, Ohio.

Horizon: Delaware Limestone.

Biostratigraphy:

Age: Middle Devonian.

Material: Median portion of cranial shield, in matrix.

Cotype: AMNH 3483: Median portion of cranial shield.

Referred material:

EASTMAN, 1907

Locality: New York.

Horizon: Onondaga limestone.

Biostratigraphy:

Age: Late Devonian.

Material:

Number: Not given.