The toothed or hooked introvert (retractable head structure) of an enoplan worm, used for capturing and manipulating food.
From Greek 'en' (in) and 'hopla' (weapons), with the diminutive or specific ending '-ion,' literally referring to the 'little armed part' of the worm.
The enoplion is like a microscopic space weapon—it can rapidly extend and retract, lined with nasty teeth to snag tiny prey floating in the darkness of the ocean floor.
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