| 1. | Unlike insects, spiders and other chelicerates do not have antennae.
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| 2. | Spiders and scorpions are members of one chelicerate group, the arachnids.
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| 3. | In most chelicerates the pedipalps are relatively small and are used as sensors.
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| 4. | The evolutionary origins of chelicerates from the early arthropods have been debated for decades.
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| 5. | Arachnids are eight-legged chelicerate arthropods with pedipalps and bodies divided into two tagmata.
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| 6. | Chelicerates were originally predators, but the group has diversified to use all the major feeding strategies.
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| 7. | The extant chelicerates comprise two marine groups : sea spiders and horseshoe crabs, and the terrestrial arachnids.
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| 8. | It has been placed among the arachnomorphs, a group of arthropods that includes the chelicerates and trilobites.
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| 9. | Peptide chains in crustaceans are about 660 amino acid residues long, and in chelicerates they are about 625.
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| 10. | In other chelicerates, such as spiders, the mesosoma is fused with the metasoma to form the opisthosoma.
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