Figure 13 in The Late Cenozoic Passerine Avifauna from Rackham's Roost Site, Riversleigh, Australia

Figure 13. Proximal left ulnae of (A–C) a fossil petroicid gen. et sp. indet. and (D–F) Petroica phoenicea AM O.60008. (A,D) cranial view, (B,E) caudal view, (C,F) ventral view. Some characteristic features of Petroicidae highlighted: 1, cotyla ventralis shallow; 2, proc. cotyla dorsalis square and its proximal edge is located distally of that of cotyla ventralis by a distance greater than one-third the length of the latter; 3, depression situated ventrally of the impressio m. scapulotricipitis; 4, protuberance for attachment of the trochlea humeroulnaris projects beyond the caudal edge of the olecranon. Scale = 2 mm.