Species: clavatus COPE, 1875
Etymology:

Holotype: AMNH 6838 formerly AMNH 8617G

Locality: Linton locality (Coal mines originally owned by the Ohio Diamond Coal Company), NE corner Sect. 13, T9N, R2W, Linton near Wellsvile, west bank near mouth of Yellow Creek, Saline Township, Jefferson County, Ohio.

Horizon: Canneloid shale underlying Upper Freeport Coal, Allegheny Group.

Biostratigraphy:

Age: Upper Westphalian D, Lower Upper Silesian series, Myachkovskian stage, Upper Moscovian Epoch, Middle Pennsylvanian (Late Carboniferous).

Material: Fragmentary skeleton.
Note: Colosteus scutellatus ROMER, 1930

Referred material:

AMNH 6863 formerly 8617G Newberry collection: 12 vertebrae and associated ribs.
Note: Erroneously as holotype MOODIE, 1916, Colosteus scutellatus ROMER, 1930.

BMNH R 2676: Impression of ribs and vertebrae.

MB. Am 47: A series of 3034 vertebrae and associated ribs.
Note: Molgophis cf. brevicostatus SCHWARZ, 1908.

MCZ 2303: Posterior portion of skull roof, pectoral girdle, and forelimb elements and portions of 13 vertebrae with associated ribs.

USNM 4509: 13-14 vertebrae associated ribs, pectoral girdle and forelimb elements.

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Species: brevicostatus (COPE, 1875)
Etymology:
= Molgophis brevicostatus COPE, 1875 (partim)

Holotype: AMNH 8341G

Locality: Linton locality (Coal mines originally owned by the Ohio Diamond Coal Company), NE corner Sect. 13, T9N, R2W, Linton near Wellsvile, west bank near mouth of Yellow Creek, Saline Township, Jefferson County, Ohio.

Horizon: Canneloid shale underlying Upper Freeport Coal, Allegheny Group.

Biostratigraphy:

Age: Upper Westphalian D, Lower Upper Silesian series, Myachkovskian stage, Upper Moscovian Epoch, Middle Pennsylvanian (Late Carboniferous).

Material: Fragmentary skeleton.