One of the mysteries of the English language finally explained.
An aquatic crustacean which is a parasite of fish, typically attached to the skin or gills.
a free-swimming crustacean with a shield-like carapace and a pair of suckers (class Branchiura: several genera, in particular Argulus).
an elongated crustacean that becomes permanently attached to the host and typically highly modified (class Copepoda: several orders and numerous species).
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