Cymothoid
Guides
Anilocra
Fish Lice
Anilocra is a genus of marine isopods in the family Cymothoidae, commonly known as fish lice. Members are obligate external parasites of teleost fishes, attaching to host skin and feeding on blood. The genus exhibits sequential hermaphroditism, with individuals beginning life as males and transitioning to females as they grow. Parasitism by Anilocra species has been documented to reduce host growth rates, fecundity, and survival.
Elthusa
Elthusa is a genus of cymothoid isopods comprising approximately 40 described species of obligate fish parasites. Species in this genus are characterized by branchial parasitism, attaching to the gill filaments of marine fish hosts where they feed on blood and tissue fluids. The genus has a worldwide distribution with records from the Atlantic, Indian, and Pacific Oceans. Several species have been described from South Africa, New Caledonia, Taiwan, and Japan, with some exhibiting host specificity while others parasitize multiple fish species.
Elthusa californica
Elthusa californica is a marine parasitic isopod in the family Cymothoidae. It attaches to the gill chambers of fish hosts and feeds on blood and tissue. The species occurs along the Pacific coast from California to Peru. Originally described as Lironeca californica, it was later transferred to Elthusa following taxonomic revision.