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5(3). With 4 pairs of jointed legs; body usually rounded and indistinctly segmented, head, thorax and abdomen fused Note: Juvenile Arachnida: Acariformes (water mites) have only 3 pairs of jointed legs.
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-With more than 4 pairs of jointed legs; body segmented Note: Branchiura has only 4 pairs of jointed legs, but body is flat not rounded. Some crustaceans may have legs fully or partially enclosed in a carapace.
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