Actinula

Ac`tin´u`la

n. pl.

(Zool.) A kind of embryo of certain hydroids (Tubularia), having a stellate form.

actinula

[ak′tin·yə·lə] (invertebrate zoology) A larval stage of some hydrozoans that has tentacles and a mouth; attaches and develops into a hydroid in some species, or metamorphoses into a medusa.

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