planula

In zoology|lang=en terms the difference between planula and actinula

is that planula is (zoology) the larva of a hydrozoan, which is free-swimming and covered in cilia while actinula is (zoology) a kind of embryo of certain hydroids (tubularia), having a stellate form.

As nouns the difference between planula and actinula

is that planula is (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 while actinula is (zoology) a kind of embryo of certain hydroids (tubularia), having a stellate form.

In biology terms the difference between gemmule and planula

is that gemmule is a small gemma or bud of dormant embryonic cells produced by some freshwater sponges while planula is 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.

As nouns the difference between planulae and planula

is that planulae is while planula is (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.