Type species: Arachnidium hippothooides Hincks, 1862
This genus includes the species:
| Arachnidium clavatum | Hincks, 1877 | Recent | N Atlantic, Arctic |
| Arachnidium fibrosum | Hincks, 1880 | Recent | Britain, Brazil |
| Arachnidium hippothooides | Hincks, 1862 | Recent | NE Atlantic |
| Arachnidium irregulare | Harmer, 1915 | Recent | Indonesia |
| Arachnidium lacourti | d'Hondt & Faasse, 2006 | Recent | NE Atlantic |
| Arachnidium longicauda | Voigt, 1980 | Cretaceous Maastrichtian | Netherlands |
| Arachnidium simplex | Hincks, 1880 | Recent | N Atlantic, Arctic |
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