| The most abundant settlers at the oyster site were the hydroid Obelia sp. |
| Sketch the Obelia Cnidaria medusa Obelia Medusae slide and label the bell, Deerhorn coral skeleton mouth, and tentacles. |
| Obelia is used in many zoology textbooks to exemplify the Hydrozoa life cycle. |
| 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. |
| In the coelenterate Obelia, the egg develops into a colonial hydroid consisting of a series of branching Hydra-like organisms called polyps. |
