Cenizo et al.—Pseudo-toothed birds from Eocene of Antarctica
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Figure 4. Pelagornithid specimens assigned to morphotype 2 from the middle Eocene of Seymour Island (West Antarctica). (1) Comparative proportions of the cranial remains from Antarctica (MLP 08-XI-30-42, MLP 78-X-26-1) and the holotype of the giant species Pelagornis chilensis (after Mayr and Rubilar-Rogers, 2010). (2, 3) rostral end of rostrum maxillare (MLP 08-XI-30-42) in lateral and dorsal views; (4–8) most rostral narial region of rostrum maxillare (MLP 78-X-26-1) in dorsal, lateral, ventral, and cranial (7, 8) views, respectively; (9–11) distal end of right tarsometatarsus (UCR 22176, cast MLP) in dorsal, plantar, and distal views, respectively. Abbreviations: cid = canalis interosseus distalis; cr = culmen ridge; ct = cristae tomiales; ftp = fossa for mandibular tooth-like processes; fvd = foramen vasculare distale; dc = dorsolateral constriction; pmp = processus medioplantaris; mvs = medioventral sulcus; ls = longitudinal sulcus; pr = palatal ridge; tp = toothlike processes (2–4 = rank); tII, tIII, and tIV = trochleae metatarsorum II, III, and IV. Scale bars = 20mm; except in 1 = 50mm.
