Hydractiniidae
| Overzicht | |
| Genera | 
Hydractinia
|
| Het leven | |
| Poliep | |
| Kolonie | |
| Hydrorhiza | |
| Hydrocaulus | |
| Hydrocladia | |
| Thecae | |
| Hydrothecae | |
| Sarcothecae | |
| Gonothecae | |
| Poliepen | |
| Voedingspoliep | |
| Voortplantingspoliep | |
| Verdedigingspoliep | |
| Schoonmaakpoliep | |
| Medusa | |
| Scherm | |
| Gonaden | |
| Mond | |
| Tentakels | |
| Zintuigen | |
| Bronnen | |