Species: attheyi (WATSON, 1926)
Holotype: HM: G13.72
Locality: Low Main Seam, Newsham, Northumberland County, England, southern United Kingdom.
Horizon: Middle coal Measures.
Biostratigraphy: Simills-pulchra zone.
Age: Westphalian B, Lower Upper Silesian series, Kashirskian Stage, Lower Moscovian Epoch, Early Middle Pennsylvanian, (Late Carboniferous).
Material: Over 12 vertebrae, 6 ribs, scutes, and femur.
Lectotype: HM G13.71 (DMSW 27): Skull with both jaw rami and rib fragments.
HM G13.76 (DMSW 32): A slab with caudal centra and ribs, scutes, etc.
HM G15.84: Dorsal vertebra, ?rib and scutes.
HM G25.51-60: Scutes.