Arachnactis albida Sars, 1846
Arachnactis bournei Fowler, 1897 accepted as Cerianthus lloydii Gosse, 1859 accepted as Synarachnactis lloydii (Gosse, 1859)
Arachnactis lloydii (Gosse, 1859) accepted as Cerianthus lloydii Gosse, 1859 accepted as Synarachnactis lloydii (Gosse, 1859)
Arachnanthus nocturnus den Hartog, 1977 accepted as Isarachnanthus nocturnus (Hartog, 1977)
Arachnanthus oligopodus (Cerfontaine, 1891)
Arachnanthus sarsi Carlgren, 1912
Isarachnactis longipes Carlgren, 1924
Isarachnanthus cruzi Brito, 1986 accepted as Isarachnanthus maderensis (Johnson, 1861)
Isarachnanthus maderensis (Johnson, 1861)
Isarachnanthus nocturnus (Hartog, 1977)