Barnacles, copepods and their relatives are all crustaceans, with the copepods and ostracods (seed shrimps) being the most numerous species. Most are tiny - only a millimeter or so in size. Some have adopted a parasitic way of life.
Goose barnaclesMaxillopoda is a diverse class of crustaceans including barnacles, copepods and a number of related animals. It does not appear to be a monophyletic group, and no single character unites all the members.
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