tigrellus, Gymnoxenisthmus Gill [A. C.], Bogorodsky [S. V.] & Mal [A. O.] 2014:492, Fig. 1 [Zootaxa 3755 (no. 5); ref. 33138] Saudi Arabia, Farasan Archipelago, 16°47.451"N, 42°11.838"E, Red Sea, depth 8 meters. Holotype (unique): SMF 34903. •Valid as Gymnoxenisthmus tigrellus Gill, Bogorodsky & Mal 2014 -- (Bogorodsky & Randall 2018:[7] 245 [ref. 36492], Golani & Fricke 2018:165 [ref. 36273], Gill et al. 2019:180 [ref. 36679], Parenti 2021:56 [ref. 38603], Gill 2022:198 [ref. 40139], Bogorodsky & Goren 2023:27 [ref. 40247]). Current status: Valid as Gymnoxenisthmus tigrellus Gill, Bogorodsky & Mal 2014. Xenisthmidae. Distribution: Red Sea endemic. Habitat: marine.