Scipionyx samniticus (Dal Sasso and Signore 1998; Dal Sasso and Maganuco 2011; SBA-SA 163760; 46.1cm; Early Cretaceous) was originally considered a compsognathid like Compsognathus. Here it is a late-surviving member of an Early Jurassic radiation that produced Spinosaurus, Deinocheirus and their kin, close to Proceratosaurus (below). The short rostrum and large orbit suggest a juvenile status, perhaps only a few days old. Internal organs were preserved along with the bones, but no outer integument was preserved. The feet and long tail are conjectural. The vertebrae of the back are not pneumatised. This taxon provides some clues to the post-crania of Proceratosaurus.

Proceratosaurus bradleyi (Woodward 1910, originally Megalosaurus; von Huene 1926; Middle Jurassic) was first considered a coelurosaur, then a tyrannosaur. Here it nests as a basal theropod close to Deinocheirus on one branch and to Guanlong on the other. The transverse premaxilla and the down-tilted jugal are exaggerated in Deinocheirus.

Dal Sasso C and Signore M 1998. Exceptional soft tissue preservation in a theropod dinosaur from Italy. Nature, 392: 383–387.

Dal Sasso C and Maganuco S 2011. Scipionyx samniticus (Theropoda: Compsognathidae) from the Lower Cretaceous of Italy — Osteology, ontogenetic assessment, phylogeny, soft tissue anatomy, taphonomy and palaeobiology, Memorie della Società Italiana de Scienze Naturali e del Museo Civico di Storia Naturale di Milano XXXVII(I): 1-281

wiki/Proceratosaurus