A group of small jellyfish-like creatures that have tentacles arranged around their mouth and are in their medusa (free-swimming) stage of life.
From Greek 'anthos' (flower) and 'medusa' (a type of jellyfish), because these organisms resemble tiny flowers with their tentacle arrangements.
These creatures are literally named 'flower-jellyfish' because ancient naturalists thought their tentacles looked like flower petals — they were doing their best to describe weird ocean life with the most poetic comparisons available.
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