The plural form of cephalothorax; multiple instances of the combined head-chest region in arthropods.
From cephalothorax + '-es' (Latin/Greek plural suffix). Standard pluralization of the anatomical term used in zoological classification.
When a biology student learns to identify arthropods, comparing the different cephalothoraxes across spider, crab, and insect specimens reveals how evolution adapted the same basic head-thorax blueprint for wildly different lifestyles—from deep-sea hunters to tree-dwelling weavers.
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