Pantydraco caducus (formerly Thecodontosaurus caducus (juvenile) Yates 2003, Late Triassic )was derived from a sister to Panphagia and was basal to Efraasia and basal Ornithischia like Daemonosaurus and Pisanosaurus in the large reptile tree.

This slender herbivore had a small skull, long neck, small pelvis and long legs, but the general build of later and larger sauropods and ornithischians is apparent here.

Galton PM, Yates AM and Kermack D 2007. Pantydraco n. gen. for Thecodontosaurus caducus YATES, 2003, a basal sauropodomorph dinosaur from the Upper Triassic or Lower Jurassic of South Wales, UK. Neues Jahrbuch für Geologie und Paläontologie – Abhandlungen 243(1):119–125.

Yates AM 2003. A new species of the primitive dinosaur Thecodontosaurus (Saurischia: Sauropodomorpha) and its implications for the systematics of early dinosaurs. Journal of Systematic Palaeontology 1(1): 1-42

wiki/Thecodontosaurus
wiki/Pantydraco