†Thecodontosaurus antiquus Morris 1843 (saurischian)
Belongs to Thecodontosaurus according to P. M. Galton 2007
Sister taxa: Thecodontosaurus elisae, Thecodontosaurus minimus, Thecodontosaurus primus
Type specimen: BCM 1836. Its type locality is Durdham Down, Quarry Steps, which is in a Triassic fissure fill limestone/breccia in the Magnesian Conglomerate Formation of the United Kingdom.
Ecology:
Average measurements (in mm): femur length 208.0, humerus length 160.0, radius length 130.0, scapula length 130.0, tibia 205.0 x 12.0, ulna length 102.2
Estimated body mass: 24.0 kg based on femur length