เชลิเซอราตา

Chelicerata is a major group of arthropods that includes living animals like spiders, scorpions, mites, ticks, horseshoe crabs, and sea spiders, as well as extinct relatives such as ancient sea scorpions. This group matters because it represents one of the largest and most diverse subdivisions of arthropods, with members found in nearly every environment on Earth and playing important roles in ecosystems.

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