Figure 2. Selected skeletal elements of Rupelornis definitus in comparison to extant Procellariiformes. A, R. definitus, proximal end of right humerus (IRSNB Av 109c) in caudal view. B, C, R. definitus, proximal end of left humerus (IRSNB Av 111) in cranial (B) and caudal (C) views. D, E, proximal right humerus of D, Lugensa brevirostris (Procellariidae) and E, Fregetta tropica (Oceanitinae). F, G, R. definitus, distal end of right humerus (IRSNB Av 102a) in caudal (F) and cranial (G) views. H, distal end of right humerus (cranial view) of L. brevirostris. I, R. definitus, proximal end of left ulna (IRSNB Av 109f) in cranial view. J, K, proximal end of left ulna of J, L. brevirostris and K, Pelagodroma marina (Oceanitinae). L, M, R. definitus, distal end of right ulna (IRSNB Av 109g) in ventral (L) and caudal (M) views. N, R. definitus, left carpometacarpus (IRSNB Av 105) in ventral view. O, R. definitus, right carpometacarpus (IRSNB Av 109k) in ventral view. P, R. definitus, right phalanx proximalis digiti majoris (IRSNB Av 104c) in ventral view. Q, right phalanx proximalis digiti majoris of L. brevirostris. Abbreviations: blg, convex bulge formed by craniocaudally sloping ventral margin of distal humerus; cph, caput humeri; dpr, depression on caudal surface of crista deltopectoralis; ext, processus extensorius; fpn, second (dorsal) fossa pneumotricipitalis; fvt, fossa ventralis; ind, processus internus indicis; itd, incisura tendinosa; ldg, ledge on caudal humerus surface; pit, pit abutting ledge on caudal surface of humerus; psd, processus supracondylaris dorsalis; rdg, ridge at beginning of incisura capitis; tbd, tuberculum dorsale. Fossil bones are coated with ammonium chloride. Scale bars = 10 mm.