| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Pennaria adamsia Lendenfeld, 1884 |
Southwest Pacific | 0.07 | |
| Pennaria armata Vanhoeffen, 1911 |
Eastern Indian Ocean | 0.18 | |
| Pennaria disticha Goldfuss, 1820 |
Feather hydroid | Indo-Pacific, Atlantic Ocean, Caribbean and the Mediterranean | 30 |
| Pennaria grandis Kramp, 1928 |
Western Central Pacific | 0.45 | |
| Pennaria pauper Kramp, 1959 |
Eastern Central Atlantic | 0.37 | |
| Pennaria rosea von Lendenfeld, 1885 |
Southwest Pacific | 0.1 | |
| Pennaria vitrea Agassiz & Mayer, 1899 |
Western Central Pacific | 0.3 |