| The larva has now become a planula, and consists of a closed sack with double walls. |
| In Aeginopsis a planula is formed by multipolar immigration. |
| The planula larva settles on a hermit crab shell and metamorphoses into a primary polyp. |
| Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva. |
| This new individual is at first an active free-swimming larva called a planula, which does not resemble either a medusa or polyp. |
| A young planula settles down as a sedentary polyp, which can sprout more polyps, sometimes for several years. |
