Planula

[plænjulә]

Definition

(noun.) the flat ciliated free-swimming larva of hydrozoan coelenterates.

Edited by Elsie--From WordNet

Definition

(n.) In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula.

(n.) The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.

Typed by Carla

Definition

n. the locomotory embryo of the cœlenterates.—adjs. Plan′ular; Plan′uliform; Plan′uloid.

Edited by Julia