A class of primitive mollusks, typically chitons, that have bilateral nerve cords and a foot for attachment.
From Ancient Greek 'amphi-' (both) + 'neuron' (nerve). The name refers to the dual nerve cords running along both sides of these creatures' bodies.
Chitons are living fossils—they've barely changed in 500 million years because they're already perfectly designed for clinging to rocks, making them evolutionary success stories.
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