Species: spinatum MOODIE, 1912
Etymology:

Holotype: YPM 793 (23) (126)

Locality: Mazon Creek, Grundy County, Illinois.

Horizon: Basal Carbondale Formation, above Morris (number 2) Coal.

Biostratigraphy:

Age: Middle Silesian series, Westephalian C, Podolskian stage, or Westephalian D, Myachkovskian stage, Moscovian Epoch, Middle Pennsylvanian (Middle Carboniferous).

Material: 9 imperfect vertebrae, from the caudal region.