The paired appendages or feeding limbs on the lower surface of certain arthropods, particularly in horseshoe crabs.
Possibly from Greek 'cheilos' (lip) combined with Latin or Greek suffix '-aria,' referring to structures near or associated with lip-like parts in anatomical terminology.
Chilaria on horseshoe crabs are evolutionary ancient structures—they've remained functionally similar for over 400 million years, making horseshoe crabs living fossils whose very appendages tell us about the Paleozoic ocean.
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