A taxonomic group of animals with radial body plans, particularly marine organisms like sea anemones, corals, and related species.
From actinoid with the Latinized ending -ea used in higher taxonomic classifications to denote a major animal grouping.
The creatures in Actinoidea are ancient masters of radial symmetry—they evolved this body plan over 600 million years ago, and it's still perfectly suited to life on the seafloor.
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