Previously unknown accordion worm discovered off the coasts of Spain

What lives off the Northwest coasts of Spain and shrinks to one-fifth of its size when alarmed? Enter the accordion worm. This recently identified marine ribbon worm, colored brown to dark green, measures 110–250 mm long and 3–4 mm wide in its unbothered state and can expand and contract its body to form regular dark-colored ring-like folds, much like the bellows of its namesake musical instrument.

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