| Nominal Species (n = 27) | Present allocation (n = 24) | Ref. |
|---|---|---|
| Gigantactis balushkini Kharin, 1984 | Gigantactis balushkini | 43997 |
| Gigantactis cheni Ho & Shao, 2019 | Gigantactis cheni | 122006 |
| Gigantactis elsmani Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis elsmani | 559 |
| Gigantactis exodon Regan & Trewavas, 1932 | Gigantactis vanhoeffeni | 10761 |
| Gigantactis gargantua Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis gargantua | 559 |
| Gigantactis gibbsi Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis gibbsi | 10761 |
| Gigantactis golovani Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis golovani | 10761 |
| Gigantactis gracilicauda Regan, 1925 | Gigantactis gracilicauda | 10761 |
| Gigantactis herwigi Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis herwigi | 26282 |
| Gigantactis ios Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis ios | 10761 |
| Gigantactis kreffti Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis kreffti | 559 |
| Rhynchactis leptonema Regan, 1925 | Rhynchactis leptonema | 10761 |
| Gigantactis longicauda Bertelsen & Pietsch, 2002 | Gigantactis longicauda | 41361 |
| Gigantactis longicirra Waterman, 1939 | Gigantactis longicirra | 10761 |
| Gigantactis macronema Regan, 1925 | Gigantactis macronema | 13608 |
| Rhynchactis macrothrix Bertelsen & Pietsch, 1998 | Rhynchactis macrothrix | 28611 |
| Gigantactis meadi Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis meadi | 9068 |
| Gigantactis microdontis Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis microdontis | 26282 |
| Teleotrema microphthalmus Regan & Trewavas, 1932 | Gigantactis microphthalmus | 26282 |
| Rhynchactis microthrix Bertelsen & Pietsch, 1998 | Rhynchactis microthrix | 28611 |
| Gigantactis paxtoni Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis paxtoni | 7300 |
| Gigantactis perlatus Beebe & Crane, 1947 | Gigantactis perlatus | 559 |
| Gigantactis perlatus (non Beebe & Crane, 1947) | Gigantactis vanhoeffeni | 10761 |
| Gigantactis savagei Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis savagei | 26282 |
| Gigantactis sexfilis Regan & Trewavas, 1932 | Gigantactis gracilicauda | 10761 |
| Gigantactis vanhoeffeni Brauer, 1902 | Gigantactis vanhoeffeni | 10761 |
| Gigantactis watermani Bertelsen, Pietsch & Lavenberg, 1981 | Gigantactis watermani | 10761 |