| Two of the commonest British hydroids belong to this family, obelia and Clytia. |
| Cnidarians of the genus Obelia form colonies of polyps in their asexual generation. |
| This is a slide of Obelia, a colonial marine cnidarian that shows a distinct polymorphism in the organization of its members. |
| In the coelenterate Obelia, the egg develops into a colonial hydroid consisting of a series of branching Hydra-like organisms called polyps. |
| It has a population of over 47 000, and includes the neighbourhoods of Moderno Predgradie, Vrabnitsa itself and Obelia. |
| Obelia is used in many zoology textbooks to exemplify the Hydrozoa life cycle. |
