nigricauda, Enneapterygius Fricke [R.] 1997:255, Fig. 52 [ ref. 23339] E'ua Island, Tongatapu Group, fringing reef at base of cliff on northwestern shore, 21°18'15"S, 174°26'20"W, depth 0-11 meters. Holotype: USNM 331035. Paratypes: BPBM 15516 (7), 29097 (14), 35222 (2); CAS 49701 (10); SMNS 18697 (4); USNM 115526 (30), 142259 (1), 297859 (27), 331031 (51), 343062 (3), 344093 (36), 344097 (55); plus non-type additional material. Type catalog: Fricke 2005:66 [ref. 29864]. •Valid as Enneapterygius nigricauda Fricke 1997 -- (Fricke & Williams in Randall & Lim 2000:632 [ref. 25122], Williams & Fricke 2001:3534 [ref. 26288], Myers & Donaldson 2003:638 [ref. 27495], Lobel & Lobel 2004:75 [ref. 27576], Randall et al. 2004:24 [ref. 27624], Randall 2005:473 [ref. 28239], Chiang & Chen 2008:197 [ref. 29932], Fricke 2009:40 [ref. 30394], Patzner et al. 2009:445 [ref. 30396], Meguro & Motomura 2010:6 [ref. 31252], Allen & Erdmann 2012:768 [ref. 31980], Fricke & Erdmann 2017:25 [ref. 35129]). Current status: Valid as Enneapterygius nigricauda Fricke 1997. Tripterygiidae: Tripterygiinae. Distribution: Western Pacific: Philippines, north to Taiwan and Ogasawara Islands, east to Vanuatu, islands of Oceania to Line Islands, Samoa, Tonga and Society Islands. Habitat: marine.