different between hydrozoan vs planula

English

Hydrozoa +? -an

hydrozoan (plural hydrozoans)

Any of many colonial coelenterates, of the class Hydrozoa, including the hydras, hydroids, hydrocorals, and siphonophores.

Latin, a little plane.

planula (plural planulae)

(biology) 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.
(zoology) The larva of a hydrozoan, which is free-swimming and covered in cilia.

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