ios, Gigantactis Bertelsen [E.], Pietsch [T. W.] & Lavenberg [R. J.] 1981:56, Figs. 59, 67 [Contributions in Science (Los Angeles) No. 332; ref. 5330] Northeastern Atlantic, southwest of Madeira, 29°49'N, 23°00'W, Discovery station 7856-48, depth 1005-1250 meters. Holotype (unique): BMNH 1977.9.13.1. Males unknown. •Valid as Gigantactis ios Bertelsen, Pietsch & Lavenberg 1981 -- (Bertelsen 1990:514 [ref. 15724], Swinney 1995:56 [ref. 22647], Swinney 1995:40 [ref. 37293], Bertelsen & Pietsch 2002:961 [ref. 26506], Hartel et al. 2008:326 [ref. 29890], Pietsch 2009:471 [ref. 30766], Pietsch 2016:2074 [ref. 34597], Carneiro et al. 2019:220 [ref. 37250], Kenchington et al. 2020:[13] [ref. 37729], Page et al. 2023:167 [ref. 40505]). Current status: Valid as Gigantactis ios Bertelsen, Pietsch & Lavenberg 1981. Gigantactinidae. Distribution: North Atlantic. Habitat: marine.