Silesauridae

Sauropodomorpha Theropoda

SAURISCHIA

DINOSAURIA

Ornithischia

Neornithischia

Elongate Deltopectoral Crest on Humerus; Semioppos-able Manual Digit I; Reduced Manual Digits IV & V; Open (perforate) Acetabulum; Potential for fuzzy integument?

DINOSAURIA (Saurischia model)

Marginocephalia Ornithopoda

Thyreophora

Skeletons by Scott Hartman (skeletaldrawing.com)

Dracohors

Special Articulations (hypo-sphene-hypantrum) in dorsal verte-brae; Elongated Neck; Hollow air sac chambers in cervicals; Meta-carpal I reduced; Enlarged thumb claw; Manual Digit II longest in the manus