Ichnospecies: caudatus MARSH, 1894
Etymology: Latin, caudatus, "tail."

Holotype:

Locality: Near Osage, in southeastern Kansas.

Horizon:

Biostratigraphy:

Age: Middle Coal Measures.

Material: Trackway with tail impression.

Referred material:

SCHULT, 1995

Locality: NMNH Locality 846, Locality 10, Red Beds north and west of Las Cruces, New Mexico.

Horizon: Robledo Mountains Member, Hueco Formation.

Biostratigraphy: Zone 13.

Age: Late Wolfcampanian, Lower Rotliegendes Epoch, Early Permian.

Material:

Number: Not given: Trackway.

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Species: reidiae HAUBOLD, ALLEN, ATKINSON, BUTA, LACEFIELD, MINKIN & RELIHAN, 2005
Etymology: In honor of Mrs. Dolores Reid, the owner of UCM when the initial specimens were recovered. Her generosity is arguably the single most important factor in the salvage of this large collection of tracks from the elements and from eventual destruction during reclamation.

Holotype: UCM 1141/1142 TPA

Locality: Union Chapel Mine, Walker County, Alabama.

Horizon: Cincosaurus beds, Lower part of the Upper Pottsville Formation.

Biostratigraphy:

Age: Westphalian A, Middle Silesian Series, Upper Bashkirian – Lower Moscovian Epoch, Middle Carboniferous (Middle Pennsylvanian).

Material: Trackway.

Paratypes:

UCM 211 AA, UCM 159 BR, UCM 196 BR, UCM 629-TPA, UCM 364 AA, UCM 60 GB, UCM 649 TPA: Trackways.