Figure 1: Main slab and interpretative drawing of specimen UFRJ-DG 031 Av.

(a) Main slab. (b) Interpretative drawing of the skeleton and feathers. (c) Reconstructed cross-section at the level of distal vanes of the feathers. (d) Reconstructed cross-section at mid-length of the rachis. (e) Reconstructed cross-section of the calamus. al, alula; cd, free caudal vertebrae; dv, dorsal vertebrae; fr, frontals; lc, left coracoid; lcp, left carpometacarpus; lf, left foot; lh, left humerus; lr, left radius; ls, left scapula; lu, left ulna; mx, maxilla; pub, pubes; py, pygostyle; ra, rachis; rc, right coracoid; rh, right humerus; rr, right radius; rt, right tibiotarsus; rtmt, right metatarsals; ru, right ulna; sp, colour spots; v, vanes. Dark grey represents the vanes, light grey represents the scapus. Scale bar, 10 mm.