Fig. 4 in New Pleistocene bird fossils in Taiwan reveal unexpected seabirds in East Asia

Fig. 4. The humeri of the fossil gaviid seabird Gavia sp. (A) and modern Gaviidae (B–F) in cranial (A1–F1), dorsal (A2–F2), caudal (A3–F3), ventral (A4–F4), and distal (A5–F5) views. A. CMM 2123 from Niubu, Chiayi, Taiwan, Liuchungchi Formation, Lower Pleistocene. B. Gavia stellata (Pontoppidan, 1763) (YIO 79598). C. Gavia arctica (Linnaeus, 1758) (YIO 72000). D. Gavia pacifica (Lawrence, 1858) (YIO 64763). E. Gavia adamsii (G.R. Gray, 1859) (YIO 63205). F. Gavia immer (Brünnich, 1764) (NHMUK S/1987.13.1). The images of CMM 2123 were obtained from CT. The image order of modern Gaviidae follows the taxonomy established by Sprengelmeyer (2014) and the photos of G. immer are courtesy of Junya Watanabe.