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Planula   Listen
noun
Planula  n.  (pl. planulae)  
1.
(Biol.) 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.
2.
(Zool.) The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.






Collaborative International Dictionary of English 0.48








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Words linked to "Planula" :   hydroid, hydrozoan



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