Ichthyological terms, not general ones.
Any member of the subclass Copepoda, a group of small marine and freshwater crustaceans of which the planktonic species are important to global ecology, forming the main constituent of oceanic zooplankton. Some species are parasites of fishes.
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Member of the copepod crustacean genus Lernaea. Adult females are parasitic on freshwater fishes.
Genus of freshwater copepods characterised and so named by possession of a single, large, median eye. Sometimes cultured as food for fry or very small fishes.
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