Abstract
The morphology of all developmental stages of the fish parasite Caligus elongatus (Copepoda; Caligidae) is described. The entire life cycle consists of 8 stages: 2 nauplii, 1 copepodid, 4 chalimi, and adults. A preadult stage does not occur as it does in some other caligids. In this respect C. elongatus differs substantially from the other major sea louse species, Lepeophtheirus salmonis, which has two preadult stages.
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