| Species | Name Used in Reference |
|---|---|
| Gigantactis balushkini Kharin, 1984 | Gigantactis balushkini (p. 958 ) |
| Gigantactis ios Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis ios (p. 961 ) |
| Gigantactis longicauda Bertelsen & Pietsch, 2002 | Gigantactis longicauda (p. 958 ) |
| Gigantactis macronema Regan, 1925 | Gigantactis macronema (p. 961 ) |
| Gigantactis microdontis Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis microdontis (p. 961 ) |
| Gigantactis savagei Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis savagei (p. 961 ) |