• Acanthascus (Acanthascus) alani Ijima, 1898
• Acanthascus (Acanthascus) alani alani Ijima, 1898
• Acanthascus (Acanthascus) alani microdiscoctasterus Tabachnick, Menshenina & Ehrlich, 2023
• Acanthascus (Acanthascus) cactus Schulze, 1886
• Acanthascus (Acanthascus) koltuni Reiswig & Stone, 2013
• Acanthascus (Acanthascus) malacus Reiswig, 2014
• Acanthascus (Acanthascus) pachyderma Okada, 1932
• Acanthascus (Acanthascus) platei Schulze, 1899
• Acanthascus (Acanthascus) profundus Koltun, 1967
• Acanthascus (Acanthascus) sacculus Ferrer Hernández, 1932
• Acanthascus (Rhabdocalyptus) arcticus (Brøndsted, 1916)
• Acanthascus (Rhabdocalyptus) asper (Schulze, 1899)
• Acanthascus (Rhabdocalyptus) australis (Topsent, 1901)
• Acanthascus (Rhabdocalyptus) baculifer (Schulze, 1904)
• Acanthascus (Rhabdocalyptus) bidentatus (Okada, 1932)
• Acanthascus (Rhabdocalyptus) borealis (Okada, 1932)
• Acanthascus (Rhabdocalyptus) capillatus (Ijima, 1897)
• Acanthascus (Rhabdocalyptus) dawsoni (Lambe, 1893)
• Acanthascus (Rhabdocalyptus) dawsoni alascensis Wilson & Penney, 1930
• Acanthascus (Rhabdocalyptus) dawsoni dawsoni (Lambe, 1893)
• Acanthascus (Rhabdocalyptus) dawsoni horridus Koltun, 1967
• Acanthascus (Rhabdocalyptus) gomezi (Tabachnick & Fromont, 2019)
• Acanthascus (Rhabdocalyptus) heteraster (Okada, 1932)
• Acanthascus (Rhabdocalyptus) lophodigitatus (Kirkpatrick, 1901)
• Acanthascus (Rhabdocalyptus) mirabilis (Schulze, 1899)
• Acanthascus (Rhabdocalyptus) mollis (Schulze, 1886)
• Acanthascus (Rhabdocalyptus) monstraster (Tabachnick, 1994)
• Acanthascus (Rhabdocalyptus) nodulosus (Schulze, 1899)
• Acanthascus (Rhabdocalyptus) tener (Schulze, 1899)
• Acanthascus (Rhabdocalyptus) tenuis (Schulze, 1899)
• Acanthascus (Rhabdocalyptus) trichotis (Reiswig, 2018)
• Acanthascus (Rhabdocalyptus) unguiculatus (Ijima, 1904)
• Acanthascus (Rhabdocalyptus) victor (Ijima, 1897)
• Acanthascus (Staurocalyptus) affinis (Ijima, 1904)
• Acanthascus (Staurocalyptus) celebesianus (Ijima, 1927)
• Acanthascus (Staurocalyptus) dowlingi (Lambe, 1893)
• Acanthascus (Staurocalyptus) entacanthus (Ijima, 1904)
• Acanthascus (Staurocalyptus) fasciculatus (Schulze, 1899)
• Acanthascus (Staurocalyptus) fuca (Tabachnick, 1989)
• Acanthascus (Staurocalyptus) glaber (Ijima, 1897)
• Acanthascus (Staurocalyptus) hamatus (Lendenfeld, 1915)
• Acanthascus (Staurocalyptus) heteractinus (Ijima, 1897)
• Acanthascus (Staurocalyptus) microchetus (Ijima, 1898)
• Acanthascus (Staurocalyptus) pamelaturnerae (Reiswig, 2018)
• Acanthascus (Staurocalyptus) pleorhaphides (Ijima, 1897)
• Acanthascus (Staurocalyptus) psilosus (Reiswig & Stone, 2013)
• Acanthascus (Staurocalyptus) roeperi (Schulze, 1886)
• Acanthascus (Staurocalyptus) rugocruciatus (Okada, 1932)
• Acanthascus (Staurocalyptus) solidus (Schulze, 1899)
• Acanthascus (Staurocalyptus) tubulosus (Ijima, 1904)
• Acanthascus (Staurocalyptus) tylotus (Reiswig & Stone, 2013)
• Acanthascus affinis (Ijima, 1904) represented as Acanthascus (Staurocalyptus) affinis (Ijima, 1904)
• Acanthascus alani Ijima, 1898 represented as Acanthascus (Acanthascus) alani Ijima, 1898
• Acanthascus arcticus (Brøndsted, 1916) represented as Acanthascus (Rhabdocalyptus) arcticus (Brøndsted, 1916)
• Acanthascus asper (Schulze, 1899) represented as Acanthascus (Rhabdocalyptus) asper (Schulze, 1899)
• Acanthascus australis (Topsent, 1901) represented as Acanthascus (Rhabdocalyptus) australis (Topsent, 1901)
• Acanthascus baculifer (Schulze, 1904) represented as Acanthascus (Rhabdocalyptus) baculifer (Schulze, 1904)
• Acanthascus bidentatus (Okada, 1932) represented as Acanthascus (Rhabdocalyptus) bidentatus (Okada, 1932)
• Acanthascus borealis (Okada, 1932) represented as Acanthascus (Rhabdocalyptus) borealis (Okada, 1932)
• Acanthascus cactus Schulze, 1886 represented as Acanthascus (Acanthascus) cactus Schulze, 1886
• Acanthascus capillatus (Ijima, 1897) represented as Acanthascus (Rhabdocalyptus) capillatus (Ijima, 1897)
• Acanthascus celebesianus (Ijima, 1927) represented as Acanthascus (Staurocalyptus) celebesianus (Ijima, 1927)
• Acanthascus dawsoni (Lambe, 1893) represented as Acanthascus (Rhabdocalyptus) dawsoni (Lambe, 1893)
• Acanthascus dowlingi (Lambe, 1893) represented as Acanthascus (Staurocalyptus) dowlingi (Lambe, 1893)
• Acanthascus entacanthus (Ijima, 1904) represented as Acanthascus (Staurocalyptus) entacanthus (Ijima, 1904)
• Acanthascus fasciculatus (Schulze, 1899) represented as Acanthascus (Staurocalyptus) fasciculatus (Schulze, 1899)
• Acanthascus fuca (Tabachnick, 1989) represented as Acanthascus (Staurocalyptus) fuca (Tabachnick, 1989)
• Acanthascus glaber (Ijima, 1897) represented as Acanthascus (Staurocalyptus) glaber (Ijima, 1897)
• Acanthascus hamatus (Lendenfeld, 1915) represented as Acanthascus (Staurocalyptus) hamatus (Lendenfeld, 1915)
• Acanthascus heteractinus (Ijima, 1897) represented as Acanthascus (Staurocalyptus) heteractinus (Ijima, 1897)
• Acanthascus heteraster (Okada, 1932) represented as Acanthascus (Rhabdocalyptus) heteraster (Okada, 1932)
• Acanthascus koltuni Reiswig & Stone, 2013 represented as Acanthascus (Acanthascus) koltuni Reiswig & Stone, 2013
• Acanthascus malacus Reiswig, 2014 represented as Acanthascus (Acanthascus) malacus Reiswig, 2014
• Acanthascus microchetus (Ijima, 1898) represented as Acanthascus (Staurocalyptus) microchetus (Ijima, 1898)
• Acanthascus mirabilis (Schulze, 1899) represented as Acanthascus (Rhabdocalyptus) mirabilis (Schulze, 1899)
• Acanthascus mollis (Schulze, 1886) represented as Acanthascus (Rhabdocalyptus) mollis (Schulze, 1886)
• Acanthascus monstraster (Tabachnick, 1994) represented as Acanthascus (Rhabdocalyptus) monstraster (Tabachnick, 1994)
• Acanthascus nodulosus (Schulze, 1899) represented as Acanthascus (Rhabdocalyptus) nodulosus (Schulze, 1899)
• Acanthascus pachyderma Okada, 1932 represented as Acanthascus (Acanthascus) pachyderma Okada, 1932
• Acanthascus platei Schulze, 1899 represented as Acanthascus (Acanthascus) platei Schulze, 1899
• Acanthascus pleorhaphides (Ijima, 1897) represented as Acanthascus (Staurocalyptus) pleorhaphides (Ijima, 1897)
• Acanthascus profundum Koltun, 1967 accepted as Acanthascus (Acanthascus) profundus Koltun, 1967
• Acanthascus profundus Koltun, 1967 represented as Acanthascus (Acanthascus) profundus Koltun, 1967
• Acanthascus roeperi (Schulze, 1886) represented as Acanthascus (Staurocalyptus) roeperi (Schulze, 1886)
• Acanthascus rugocruciatus (Okada, 1932) represented as Acanthascus (Staurocalyptus) rugocruciatus (Okada, 1932)
• Acanthascus sacculus Ferrer Hernández, 1932 represented as Acanthascus (Acanthascus) sacculus Ferrer Hernández, 1932
• Acanthascus solidus (Schulze, 1899) represented as Acanthascus (Staurocalyptus) solidus (Schulze, 1899)
• Acanthascus tener (Schulze, 1899) represented as Acanthascus (Rhabdocalyptus) tener (Schulze, 1899)
• Acanthascus tenuis (Schulze, 1899) represented as Acanthascus (Rhabdocalyptus) tenuis (Schulze, 1899)
• Acanthascus tubulosus (Ijima, 1904) represented as Acanthascus (Staurocalyptus) tubulosus (Ijima, 1904)
• Acanthascus unguiculatus (Ijima, 1904) represented as Acanthascus (Rhabdocalyptus) unguiculatus (Ijima, 1904)
• Acanthascus victor (Ijima, 1897) represented as Acanthascus (Rhabdocalyptus) victor (Ijima, 1897)
• Acoelocalyx brucei Topsent, 1910
• Advhena magnifica Castello-Branco, Collins & Hajdu, 2020
• Amphidiscella abyssalis Reiswig & Kelly, 2018
• Amphidiscella atlantica Tabachnick & Collins, 2008
• Amphidiscella caledonica Tabachnick & Lévi, 1997
• Amphidiscella hosiei Tabachnick & Fromont, 2019
• Amphidiscella lecus Reiswig, 2014
• Amphidiscella monai Tabachnick & Lévi, 1997