更多planula例句

1. Planula, plan′ū-la, n. the locomotory embryo of the cœlenterates.
2. The upper surface of the planula then becomes depressed and forms a gullet, and in time a complete animal is formed.
3. The name Planula signifies "wandering animal," because the Planula larva swims about by means of cilia.
4. The Turbellarians have some features in common with the Cœlenterate planula.
5. The larva has now become a planula, and consists of a closed sack with double walls.