A family of red algae characterized by helical or coiled filamentous structures resembling worms.
From Greek 'helminthos' (worm) plus 'klados' (branch), plus the Latin family suffix '-aceae.' The name describes the worm-like branching appearance of these seaweed organisms.
These red algae look distinctly wormy to the naked eye—their coiled structures confused early naturalists who sometimes classified them as animal parasites instead of plants. Modern taxonomy sorted out that they're perfectly harmless seaweeds.
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