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KEY CONCEPT Arachnids include spiders and their relatives.

KEY CONCEPT Arachnids include spiders and their relatives. Arachnids are the largest group of chelicerates. There are three major groups of chelicerates. horseshoe crabs. Arachnids are the largest group of chelicerates. There are three major groups of chelicerates. horseshoe crabs.

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KEY CONCEPT Arachnids include spiders and their relatives.

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  1. KEY CONCEPT Arachnids include spiders and their relatives.

  2. Arachnids are the largest group of chelicerates. • There are three major groups of chelicerates. • horseshoe crabs

  3. Arachnids are the largest group of chelicerates. • There are three major groups of chelicerates. • horseshoe crabs • sea spiders • arachnids

  4. fangs poison gland spinnerets • Chelicerates share several features. • no antennae • four pairs of walking legs • one pair each of chelicerae and pedipalps • Arachnids are a group of chelicerates that live on land. • eight legs • fanglike pincersthat inject venom • silk glands

  5. Arachnids have four different adaptations that reduce water loss. • waterproof cuticle • book lungs • Malpighian tubules • spiracles

  6. Arachnids have evolved into a diverse group. • All spiders make silk and produce venom.

  7. Arachnids have evolved into a diverse group. • Spiders make up half of the more than 60,000 known arachnid species. • Arachnids also include mites, ticks, chiggers, and scorpions.

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