Fig. 2

Avian remains from Swiss localities. a1–b3 Eleutherornis helveticus Schaub, 1940 from the Middle Eocene of Egerkingen: a1–a3 synsacrum (NMB Eh.781, holotype) in lateral (a1), dorsal (a2), and ventral (a3) views. b1–b3 Caudal portion of synsacrum (NMB Eh.782) in lateral (b1), dorsal (b2), and ventral (b3) views. c1–f2 Pedal phalanges from the Middle Eocene of Egerkingen, Aves indet: c1–c2 NMB Ef. 999. d1–d2 NMB Ef. 1000. e1–e2 NMB Ef. 998. f1–f2 NMB Ef. 1001. g1–g2 Fragment of pedal phalanx from the Late Eocene of Gösgen (NMB H.R.137). h–i Aves indet., distal right ulnae from the Middle Eocene of Egerkingen: h NMB Eg. 611. i NMB Eg. 612. j Cranial view of distal right tibiotarsus (NMB Ms.103) from the Middle Eocene of Moutier, Gallinuloididae indet. k Right radius (NMB U.M.6483) from the Late Oligocene of Wolfswil, Aves indet. l1–l2 Distal right tarsometatarsus (NMB U.M.6484) from the Late Oligocene of Wolfswil in dorsal (l1) and distal (l2) views, Aves indet. m Sternal portion of right coracoid (NMB U.M.6485) from the Late Oligocene of Wolfswil in dorsal view, Aves indet. n1–n2 Suliformes indet., left carpometacarpus (NMB O.S.M.1263) from the Middle Miocene of Stein am Rhein in dorsal (n1) and ventral (n2) views. Scale bars 10 mm, except in g1–g2 and l1–l2 (1 mm)