Figure 4 in Phylogenetic affinities and taxonomy of the Oligocene Diomedeoididae, and the basal divergences amongst extant procellariiform birds

Figure 4. Selected skeletal elements of Rupelornis definitus in comparison to extant Procellariiformes. A–C, R. definitus, proximal end of right tibiotarsus (IRSNB Av 114b) in craniomedial (A), cranial (B), and caudolateral (C) views. D, proximal tibiotarsus of Fulmarus glacialis (Procellariidae) in lateral view. E, R. definitus, proximal end of right tibiotarsus (IRSNB Av 112d) in lateral view. F, G, R. definitus, distal end of left tibiotarsus (IRSNB Av 103c) in cranial (F) and medial (G) views. H, distal tibiotarsus (medial view) of F. glacialis. I, R. definitus, proximal end of right tarsometatarsus (IRSNB Av 114c) in plantar view. J-L, R. definitus, proximal end of right tarsometatarsus (IRSNB Av 113) in dorsal (J), plantar (K), and proximal (L) views. M, proximal end of right tarsometatarsus of Fregetta tropica (Oceanitinae) in proximal view. N, O, R. definitus, first phalanx of left second toe (IRSNB Av 104e) in dorsal (N) and plantar (O) views. P, R. definitus, first phalanx of left third toe (IRSNB Av 104g) in dorsal view. Q, R, R. definitus, first phalanx of right fourth toe (IRSNB Av 112f) in plantar (Q) and dorsal (R) views. Abbreviations: ccc, crista cnemialis cranialis; ccl, crista cnemialis lateralis; clh, crista lateralis hypotarsi; cmh, crista medialis hypotarsi; fdl, canal for tendon of musculus flexor digitorum longus; fhl, canal for tendon of musculus flexor hallucis longus; lat, lateral hypotarsal canals of Oceanitinae; ntc, notch in distal rim of condylus medialis; sul, tendinal sulcus. Fossil bones are coated with ammonium chloride. Scale bars = 10 mm, except for M = 5 mm.