"rami" at the tip. Parasitic copepods (the other seven orders) vary widely in morphology and no generalizations are possible.

Because of their small size, copepods have no need of any heart or circulatory system (the members of the order Calanoida have a heart, but no blood vessels), and most also lack gills. Instead, they absorb oxygen directly into their bodies. Their excretory system consists of maxillary glands.

Behavior

The

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