Species: swisshelmense THAYER, 1985
Etymology:

Holotype: UALP 5169

Locality: UALP 7205, Swisshel Mountains, Cochise County, Arizona.

Horizon: Black Prince Limestone, one meter below contact with overlying Pennsylvanian Horquilla limestone.

Biostratigraphy:

Age: Late Morrowan or earliest Derryan (equivalent to Langsettian – Duckmantia boundary), Westephalian, lower upper Silesian, upper Bashkrian or lower Moscovian Epoch, early Pennsylvanian (Late Carboniferous).

Material: A dorsal vertebra lacking the left rib-bearers and the right posterior neural arch and centrum.

Referred specimen:

UALP 4958, 4963, 5149, 5164, 5168, 5175, 5202, 5208, 5692, 5864, 6036, 6057, 6058, 6222: Disarticulated vertebrae.