altus, Pomacentrus Okada [Y.] & Ikeda [H.] 1937:87, Fig. 3; Pl. 4 (fig. 1) [Bulletin of the Biogeographical Society of Japan v. 7; ref. 17211] Kowan, Okinawa Island, Okinawa Prefecture, Ryukyu Islands, Japan. Holotype (unique): YCM-P 30064 [ex Okada coll. spec. 2295]. Type catalog: Shibata et al. 2011:16 [ref. 31469] with lectotype. Type information and lectotype designation [not needed]: Hayashi 1995:25 [ref. 22717]. •Valid as Stegastes altus (Okada & Ikeda 1937) -- (Yoshino in Masuda et al. 1984:194 [ref. 6441], Allen & Emery 1985:11 [ref. 5236], Allen 1991:252 [ref. 19344], Allen in Randall & Lim 2000:627 [ref. 25122], Nakabo 2000:950 [ref. 25182], Nakabo 2002:950 [ref. 26193], Choi et al. 2003:364, 635 [ref. 26218], Motomura et al. 2010:159 [ref. 31256], Motomura et al. 2015:26 [ref. 34709], Koeda et al. 2016:71 [ref. 35333], Koeda et al. 2016:12 [ref. 35354], Imamura in Kimura et al. 2018:218 [ref. 36460], Yoshigou 2019:194 [ref. 36714], Kim et al. 2020:149 [ref. 39118], Sonoyama et al. 2020:82 [ref. 37637], Parenti 2021:81 [ref. 38418]). •Valid as Plectroglyphidodon altus (Okada & Ikeda 1937) -- (Tang et al. 2021:286 [ref. 38308], Fujiwara et al. 2022:91 [ref. 39094], Sato et al. 2023:10 [ref. 40949]). Current status: Valid as Plectroglyphidodon altus (Okada & Ikeda 1937). Pomacentridae: Microspathodontinae. Distribution: Northwestern Pacific: northern Vietnam and Taiwan to Korea and southern Japan. Habitat: marine.