semeion, Chaetodon Bleeker [P.] 1855:450 [Natuurkundig Tijdschrift voor Nederlandsch Indië v. 8 (no. 3); ref. 16841] Cocos-Keeling Islands, Indian Ocean. Syntypes: (2). •Valid as Chaetodon semeion Bleeker 1855 -- (Burgess 1978:618 [ref. 700], Allen 1980:161 [ref. 22764], Ida in Masuda et al. 1984:184 [ref. 6441], Blum 1989:13 [ref. 37553], Randall et al. 1990:228 [ref. 15987], Allen 1997:152 [ref. 23977] as semion, Kuiter 1997:214 [ref. 25488], Randall et al. 1997:228 [ref. 25919], Myers 1999:166 [ref. 23965], Allen 2000:89 [ref. 37268] as semion, Pyle in Randall & Lim 2000:623 [ref. 25122], Nakabo 2000:889 [ref. 25182], Randall & Earle 2000:15 [ref. 25806], Hutchins 2001:265 [ref. 25841], Hutchins 2001:36 [ref. 25847], Pyle 2001:3251 [ref. 26117] as semion, Nakabo 2002:889 [ref. 26193], Allen & Adrim 2003:42 [ref. 26830], Smith et al. 2003:303 [ref. 27125], Myers & Donaldson 2003:630 [ref. 27495], Lobel & Lobel 2004:72 [ref. 27576], Randall et al. 2004:18 [ref. 27624], Randall 2005:319 [ref. 28239], Mundy 2005:398 [ref. 28379], Allen et al. 2006:1294 [ref. 29090], Zuo & Tang 2011:1003 [ref. 32151], Allen & Erdmann 2012:531 [ref. 31980] as semion, Fricke et al. 2014:101 [ref. 33932], Delrieu-Trottin et al. 2015:6 [ref. 33988], Koeda et al. 2016:55 [ref. 35333], Fricke et al. 2019:187 [ref. 36673], Heemstra & Heemstra 2022:460 [ref. 39746]). Current status: Valid as Chaetodon semeion Bleeker 1855. Chaetodontidae: Chaetodontinae. Distribution: Indo-West Pacific: Sri Lanka, Christmas Island (Australia) and Cocos Keeling Islands (Australia) east to Line Islands (Kiribati) and Tuamotu Islands (French Polynesia), north to Ryukyu Islands (Japan), south to Great Barrier Reef (Queensland, Australia). Habitat: marine.