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.
an elongated crustacean that becomes permanently attached to the host and typically highly modified (class "Copepoda": several orders and numerous species).
a free-swimming crustacean with a shield-like carapace and a pair of suckers (class "Branchiura": several genera, in particular "Argulus").
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