Species: grandiceps COPE, 1865
Etymology:

Holotype: Lost in a fire.

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, best replica omega Late Pennsylvanian (Late Carboniferous).

Material: Skull and skeleton.

Neotype: YPM 794 (1234)

(MOODIE 1912)

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material: Greater part of the vertebral column, ventral aramature, ribs, portions of the pectoral girdle, the pelvic girdle, and all four limbs, with the hand and feet in an unusually prefect condition.

 

Locality: Pit 11 spoil heap, Will-Kankakee Counties, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material:

FMNH PR558: Fragmentary skull and fragmentary skeleton.

FMNH PR664: Fragmentary skull and fragmentary skeleton.

 

EATON, 1974

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material:

UC 2000: Fragmentary skull and fragmentary skeleton.

 

= Hyphasma laevus COPE, 1875
Etymology:

Holotype: AMNH 9023 and counterpart.

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.

 

= Micrerpeton caudatum MOODIE, 1909
Etymology: Latin, caudatus, "tail."

Holotype: FMNH UR38 (previously UC 12313)

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material: Skull and skeleton.

 

= Mazonerpeton longicaudatum MOODIE, 1912b
Etymology: Latin, longus, "long" and Latin, caudatus, "tail."

Holotype: YPM 795 (1234)

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material: Fragmentary skull, nearly the entire vertebral column, consisting of cervical, dorsal, sacral and caudal cosmograph daytona replica on sale vertebrae, 36 in number; several ribs preserved on each side of the vertebral column, a portion of the ventral armature, the scapulae, a clavicle, the interclavicle, both humeri, the radius, and ulna of one side and the ulna of the other, portions of both hands, the ilium of the right side, both femora, and a partial impression of the left tibia.

= Mazonerpeton costatum MOODIE, 1912b
Etymology:

Holotype: YPM 800 (777)

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material: A part of the skull and left mandible, 2 clavicles, a humerus, impressions of several vertebrae, a portion of the dorsal region of the body, with several ribs, two portions of the caudal region, with several ribs, and some unidentified fragments.

Referred material:

YPM 804 (332): Rib.

USNM 4400: Fragmentary skull and skeleton Counter part to type.

 

= Miobatrachus romeri WATSON, 1940
Etymology: In honor of Alfred S. Romer.

Holotype: FMNH UC2000

Locality: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch,omega seamaster watch replica Late Pennsylvanian (Late Carboniferous).

Material: Fragmentary skull and fragmentary skeleton with a counterpart.