Crustaceans is one of the animals was not vertebrates which belong to the Phylum Arthropoda, phylum and Crustaceans sub very close connection with insects, spiders and Millipede. Her plans section or bersendi-sendi, each connected by joints muscles making it easy to move. Besides crustaceans have "exoskeleton" or outer bone (karapas) formed by chitin or lime substance.The term comes from the Roman crustaceans i.e. crusta meaning a hard shell (the crust). A hard shell made of chitin layer that serves to protect himself.
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