A genus of small sea anemones that can live symbiotically inside certain sea cucumbers.
From Greek 'arachne' (spider) + 'aktis' (ray or tentacle). Named in the 1800s for the spider-like appearance of their delicate tentacles.
These tiny anemones live inside sea cucumbers like miniature roommates—they're protected and get food scraps, while the sea cucumber gets cleaning service and protection from predators!
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