In biology, a class of marine worms (priapulid worms) characterized by having an introvert armed with teeth or hooks for capturing prey.
From Greek 'en' (in) and 'hopla' (weapons, armor), literally meaning 'armed' or 'with weapons.' The name refers to the tooth-bearing appendages these worms possess.
These tiny ocean worms are basically ancient ninjas—their introverti (retractable heads) are lined with murderous teeth and hooks, making them ferocious hunters despite being practically invisible to the naked eye.
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