| Species | Name Used |
|---|---|
| Sycozoa cerebriformis (Quoy & Gaimard, 1834) | Sycozoa cerebriformis (p. ) |
| Symplegma viride Herdman, 1886 | Symplegma viride (p. ) |
| Synoicum arenaceum (Michaelsen, 1924) | Synoicum arenaceum (p. ) |
| Synoicum papilliferum (Michaelsen, 1930) | Synoicum papilliferum (p. ) |