helianthoidea definition

  • noun-plural:
    • An order of Anthozoa; the Actinaria.
  • others:
    • An order or some comparable band of malacodermatous or soft-bodied anthozoan or zoantharian polyps, associated with course Actinozoa; the sea-anemones, in an extensive sense, represented by the Actiniid√¶ and associated families. Groups pretty much precisely synonymous are Actiniaria, Hexacoralla, and Malacodermata. In Addition Helianthoida.
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