| Nominal Species (n = 41) | Present allocation (n = 24) | Ref. |
|---|---|---|
| Sycon abyssale Borojevic & Graat-Kleeton, 1965 | Sycon abyssale | 3477 |
| Sycetta antarctica Brøndsted, 1931 | Sycetta antarctica | 19 |
| Sycum arcticum Haeckel, 1870 | Sycon arcticum | 75097 |
| Sycetta asconoides Breitfuss, 1896 | Sycetta asconoides | 19 |
| Spongia ciliata Fabricius, 1780 | Scypha ciliata | 897 |
| Spongia ciliatum Fabricius, 1780 | Sycon ciliatum | 75097 |
| Sycandra commutatum Haeckel, 1872 | Sycon ciliatum | 75097 |
| Spongia compressa Fabricius, 1780 | Scypha compressa | 897 |
| Spongia coronatum Ellis & Solander, 1786 | Sycon ciliatum | 75097 |
| Sycum giganteum Haeckel, 1870 | Sycon ciliatum | 75097 |
| Sycon huinayense Azevedo, Hajdu, Willenz & Klautau, 2009 | Sycon huinayense | 3477 |
| Sycon karajakense Breitfuss, 1897 | Sycon karajakense | 3477 |
| Sycon kerguelense Urban, 1908 | Sycon kerguelense | 7979 |
| Teichonella labyrinthica Carter, 1878 | Scypha labyrinthica | 897 |
| Sycortis laevigata Haeckel, 1872 | Scypha laevigata | 897 |
| Sycum lanceolatum Haeckel, 1870 | Sycon ciliatum | 75097 |
| Leucandra lunulata Haeckel, 1872 | Scypha lunulata | 897 |
| Sycandra maximum Haeckel, 1872 | Sycon arcticum | 75097 |
| Sycon mundulum Lambe, 1900 | Sycon mundulum | 3477 |
| Sycon oscari Van Soest & De Voogd, 2018 | Sycon oscari | 3477 |
| Sycum ovatum Haeckel, 1870 | Sycon ciliatum | 75097 |
| Sycocystis oviformis Haeckel, 1870 | Sycon ciliatum | 75097 |
| Spongia paniceum Esper, 1794 | Sycon ciliatum | 75097 |
| Sycon plumosum Tanita, 1943 | Sycon plumosum | 3477 |
| Sycandra polare Haeckel, 1872 | Sycon arcticum | 75097 |
| Tenthrenodes primitiva Brøndsted, 1931 | Sycetta antarctica | 75097 |
| Sycon protectum Lambe, 1896 | Sycon protectum | 834 |
| Syconella quadrangulata Schmidt, 1868 | Sycon quadrangulatum | 75097 |
| Syconella quadrangulatum Schmidt, 1868 | Sycon quadrangulatum | 75097 |
| Sycortis quadratum Haeckel, 1872 | Sycon quadrangulatum | 75097 |
| Sycetta quadriradiata Hozawa, 1929 | Sycetta quadriradiata | 19 |
| Grantia ramosa Smith, 1872 | Scypha ramosa | 897 |
| Sycodendrum ramosum Haeckel, 1870 | Sycon ciliatum | 75097 |
| Sycon raphanus Schmidt, 1862 | Sycon raphanus | 84290 |
| Sycetta sagitta de Laubenfels, 1942 | Sycetta sagitta | 19 |
| Sycetta sagittifera Haeckel, 1872 | Sycetta sagittifera | 19 |
| Sycandra staurifera Preiwisch, 1904 | Sycon stauriferum | 3477 |
| Sycandra tergestina Haeckel, 1872 | Sycon raphanus | 84290 |
| Sycandra tesserarium Haeckel, 1872 | Sycon quadrangulatum | 75097 |
| Sycortis tetragonum Haeckel, 1872 | Sycon quadrangulatum | 75097 |
| Syconella tubulosum Haeckel, 1870 | Sycon ciliatum | 75097 |