longirostrum, Hexatrematobatis Chu [Y.-T.] & Meng [Q.-W.] in Chu, Meng, Hu & Li 1981:111 [English p. 116], Fig. 4 (double) [Oceanologia et Limnologia Sinica v. 12 (no. 2); ref. 4841] South China Sea, 18.5°- 21°N, 112°-114°E, depth 350-1000 meters. Holotype: SCSFRI 00072 (lost). Paratypes: SFC 00306 (1). •Valid as Hexatrygon longirostra (Chu & Meng 1981) -- (Nakaya in Masuda et al. 1984:15 [ref. 6441], Nakaya in Okamura & Kitajima 1984:73, 311 [ref. 8057], Shen 1986:175 [ref. 8041], Nishida 1990:92 [ref. 19783], Chave & Mundy 1994:380 [ref. 22375], Nakabo 2000:175 [ref. 25086], Nakabo 2002:175 [ref. 26001], Shinohara et al. 2005:398 [ref. 28370]). •Questionably a synonym of Hexatrygon bickelli Heemstra & Smith 1980 -- (Compagno & Last 1999:1477 [ref. 24637], Compagno 1999:494 [ref. 25589]). •Synonym of Hexatrygon bickelli Heemstra & Smith 1980 -- (Compagno et al. 2005:69 [ref. 29145], Endo & Machida 2005:51 [ref. 30827], Babu et al. 2011:137 [ref. 31420], White & Last 2013:243 [ref. 33042], Weigmann 2016:144 [ref. 34211]). Current status: Synonym of Hexatrygon bickelli Heemstra & Smith 1980. Hexatrygonidae. Habitat: marine.