| In moon jellies, the eggs lodge in pits on the oral arms, which form a temporary brood chamber for the developing planula larvae. |
| In Aeginopsis a planula is formed by multipolar immigration. |
| Schematic view of a transverse section of the late planula of the anthozoan Euphyllia rugosa. |
| This complicated bilayered structure is typical of anthozoan late planula larvae. |
| The planula larva settles on a hermit crab shell and metamorphoses into a primary polyp. |
| Hydra lives in freshwater, lacks a ciliated planula, and has clearly lost a medusa stage during its ancestry. |
