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], Allen & Erdmann 2024:564 [ref. 40796]). 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.