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. 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:
- Ergasilus anchoratus <small>Markevich, 1946</small>
- Ergasilus arthrosis <small>L. S. Roberts, 1969</small>
- Ergasilus auritus <small>Markevich, 1940</small>
- Ergasilus briani <small>Markevich, 1932</small>
- Ergasilus caeruleus <small>C. B. Wilson, 1911</small>
- Ergasilus celestis <small>J. F. Müller, 1937</small>
- Ergasilus centrarchidarum <small>Wright, 1882</small>
- Ergasilus cerastes <small>L. S. Roberts, 1969</small>
- Ergasilus chautauquaensis <small>Fellows, 1887</small>
- Ergasilus clupeidarum <small>S. K. Johnson & W. A. Rogers, 1972</small>
- Ergasilus cotti <small>Kellicott, 1892</small>
- Ergasilus curticrus <small>Muriel-Hoyos, Santana-Pineros, Cruz-Quintana & Suarez-Morales, 2015</small>
- Ergasilus cyanopictus
- Ergasilus cyprinaceus <small>W. A. Rogers, 1969</small>
- Ergasilus elongatus <small>C. B. Wilson, 1916</small>
- Ergasilus ereimia <small>Vandenberg, 2026</small>
- Ergasilus felichthys <small>(Pearse, 1947)</small>
- Ergasilus fryeri
- Ergasilus funduli <small>Krøyer, 1863</small>
- Ergasilus gibbus <small>Von Nordmann, 1832</small>
- Ergasilus globosus
- Ergasilus labracis <small>Krøyer, 1863</small>
- Ergasilus lamellifer <small>Fryer, 1961</small>
- Ergasilus lanceolatus <small>C. B. Wilson, 1916</small>
- Ergasilus lizae <small>Krøyer, 1863</small>
- Ergasilus longimanus
- Ergasilus luciopercarum <small>Henderson, 1926</small>
- Ergasilus manicatus <small>C. B. Wilson, 1911</small>
- Ergasilus megaceros <small>C. B. Wilson, 1916</small>
- Ergasilus mugilis <small>Vogt, 1877</small>
- Ergasilus myctarothes
- Ergasilus nerkae <small>L. S. Roberts, 1963</small>
- Ergasilus orientalis
- Ergasilus rhinos <small>Burris & G. C. Miller, 1972</small>
- Ergasilus sieboldi <small>Von Nordmann, 1832</small>
- Ergasilus tenax <small>L. S. Roberts, 1965</small>
- Ergasilus turgidus <small>Fraser, 1920</small>
- Ergasilus versicolor <small>C. B. Wilson, 1911</small>
- Ergasilus wareaglei <small>S. K. Johnson, 1971</small>
- Ergasilus wilsoni
References