noun (plural planulae /-ˌlē/)Zoology
A free-swimming coelenterate larva with a flattened, ciliated, solid body.
- Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva.
- The planula larva settles on a hermit crab shell and metamorphoses into a primary polyp.
- The planula larva has very few apoptotic cells.
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