Subphylum Crustacea: arthropods typically bearing two pairs of antennae and a hard exoskeleton, mostly aquatic, including crabs, lobsters, shrimp and barnacles. Excludes insects and arachnids, the other two major arthropod groups, which lack a crustacean second antenna pair.
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1. Wikipedia: Crustacean
WikipediaCrustacean, Anatomy sectionQuote, Crustacean, Anatomy section
In most decapods, the females retain the eggs until they hatch into free-swimming larvae.
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