Crossword-Solution: PLANULA
Dictionary
| Word | Word Type | Definition |
|---|---|---|
| Planula | 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. |
| Planula | 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. |
We have 1 clue for the answer “PLANULA”
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|---|---|
| Larva | 29 answers |
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Poet’s word, with inverted comma, for the end of the day
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E
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Hint 1 meaning
The old plural of Eye.
Hint 2 anagram
ENE
Hint 3 another clue
AND STILL ___
17 +1
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Sentences with PLANULA (5)
Some said that the original embryonic form of the metazoa was not the gastrula, but the "planula"--a double-walled vesicle with closed cavity and without mouth-aperture; the latter was supposed to pierce through gradually.
Section of Magosphaera planula, showing how the pear-shaped cells in the centre of the gelatinous ball are connected by a fibrous process.
The wall of the planula is next pushed in on one side, or invaginated, whereby it is converted into a double-walled sac with an opening, the _blastopore_, which leads into the cavity lined by the inner wall.
Some said that the original embryonic form of the metazoa was not the gastrula, but the “planula”—a double-walled vesicle with closed cavity and without mouth-aperture; the latter was supposed to pierce through gradually.
Ray Lankester, in his paper of 1873, and more fully in 1877,[442] propounded a "Planula" theory, according to which the ancestral form of the Metazoa was a two-layered closed sac formed typically by delamination, less often by invagination.