Fig. 5 in New Pleistocene bird fossils in Taiwan reveal unexpected seabirds in East Asia

Fig. 5. Tibiotarsi of the fossil gaviid seabird Gavia stellata (Pontoppidan, 1763) (A) and modern Gaviidae (B–F), in cranial (A1–F1), lateral (A2–F2), caudal (A3–F3), medial (A4–F4), and distal (A5–F5) views. A. CMM 2124 from Niubu, Chiayi, Taiwan, Liuchungchi Formation, Lower Pleistocene. B. Gavia stellata (Pontoppidan, 1763) (YIO 79598). C. Gavia arctica (Linnaeus, 1758) (YIO 79597). D. Gavia pacifica (Lawrence, 1858) (YIO 60621). E. Gavia adamsii (G.R. Gray, 1859) (YIO 74354); F. Gavia immer (Brünnich, 1764) (NHMUK S/1987.13.1). Arrows on C4–F4 and C5–F5 indicate the caudomedial process present in these taxa that is lacking in G. stellata. The image order of modern Gaviidae follows the taxonomy established by Sprengelmeyer (2014) and the photos of G. immer are courtesy of Junya Watanabe.