Species: haplous CARROLL, 1964
Etymology:

Holotype: RM 3166

Locality: Joggins, Nova Scotia Province, Canada.

Horizon: Cumberland Group, Joggins Formation.

Biostratigraphy:

Age: Westephalian B, upper Westphalian, Middle Silesian series, Kashirskian Stage, Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material: Central portion of skull roof, lower jaw, parasphenoid, vertebral column, ribs, humerus, pelvic girdle, femur and foot; figured by STEEN 1934 (1934, fig. 22c, p. 490) as "Hylonomus” latidens.

Paratypes:

RM 12202: Presacral vertebra.

RM 2.1191a: Distal end of humerus and scales.

BMNH R5778, D. M. S. Watson Collection B. 239: Distal end of humerus.