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What are examples of the large and small groups of crustaceans?

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Crustaceans can be divided according to size into two main groups. The larger group, which is divided into the classes Branchiopoda, Copepoda, Ostracoda, and Cirripedia, includes the familiar shrimp , crayfish , lobsters , and crabs . The smaller group includes species that are either microscopic or range up to a few inches (about 5 cm) in size. Most of the smaller marine forms can be found in plankton (see marine biology ) and thereby occupy an important position in the marine food chain.

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