actinula definition

  • noun:
    • a type of embryo of particular hydroids (Tubularia), having a stellate form.
    • A name written by Allman into larval condition of Hydrophora (Hydrozoa), showing up as soon as the ciliated locomotive planula or embryo is becoming fixed by its aboral end, and it has passed away in to the elongated gastrula-stage by the development of this mouth featuring its circlet of tentacles. See planula.
  • noun-plural:
    • a type of embryo of particular hydroids (Tubularia), having a stellate form.
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