labialis, Isistius Meng [Q.-W.], Zhu [Y.-D.] & Li [S.] 1985:442 [English p. 444], Fig. 1 [Acta Zootaxonomica Sinica v. 10 (no. 4); ref. 8135] South China Sea, 18°40'-19°32'N, 112°31'-113°57'E, depth 520 meters. Holotype (unique): SCSFRI S07257. •Valid as Isistius labialis Meng, Zhu & Li 1985 -- (Compagno in Randall & Lim 2000:580 [ref. 25122]). •Questionably valid as Isistius labialis Meng, Zhu & Li 1985 -- (Compagno 1999:475 [ref. 25589]). •Synonym of Isistius brasiliensis (Quoy & Gaimard 1824) -- (White & Last 2013:237 [ref. 33042], Dyldin 2015:54 [ref. 34524], Weigmann 2016:56 [ref. 34211], Figueiredo Petean & Carvalho 2018:18 [ref. 36078]). Current status: Synonym of Isistius brasiliensis (Quoy & Gaimard 1824). Dalatiidae. Habitat: marine.