Tags: Crustacean.

Ergasilus is a genus of copepod crustaceans occurring in both the ocean and fresh water often called gill lice. The females are parasitic upon the gills of fishes. This is similar to members of the crustacean order Arguloida (fish lice). Being copepods gill lice have a single median eye on their head. The second antennae are modified into prehensile pincers. Male gill lice are free-living.Species include:

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