what are the chief characteristics of crustaceans
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A crustacean has the following features: a segmented body with a hard exterior (known as an exoskeleton) jointed limbs, each often with two branches (termed biramous) two pairs of antennae.
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A hard exoskeleton made of calcium - no internal skeleton.
The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.
A pair of green glands excrete wastes near the base of antennae.
The abdominal segments have swimmerets (swimming legs)
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