| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Spongia ciliatum | Fabricius, 1780 | synonym | No | senior synonym |
original combination |
| Spongia coronatum | Ellis & Solander, 1786 | synonym | No | junior synonym |
original combination |
| Spongia paniceum | Esper, 1794 | synonym | No | junior synonym |
original combination |
| Sycandra commutatum | Haeckel, 1872 | synonym | No | junior synonym |
original combination |
| Sycocystis oviformis | Haeckel, 1870 | synonym | No | junior synonym |
original combination |
| Sycodendrum ramosum | Haeckel, 1870 | synonym | No | junior synonym |
original combination |
| Sycon ciliatum | (Fabricius, 1780) | accepted name | Yes | senior synonym |
new combination |
| Sycon coronatum | (Ellis & Solander, 1786) | synonym | No | junior synonym |
new combination |
| Syconella tubulosum | Haeckel, 1870 | synonym | No | junior synonym |
original combination |
| Sycum giganteum | Haeckel, 1870 | synonym | No | junior synonym |
original combination |
| Sycum lanceolatum | Haeckel, 1870 | synonym | No | junior synonym |
original combination |
| Sycum ovatum | Haeckel, 1870 | synonym | No | junior synonym |
original combination |