Elacatinus is a genus of marine gobies, often known collectively as the neon gobies. Although only one species, E. oceanops, is technically the "neon goby," because of their extremely similar appearance, other members of the genus are generally labeled neon gobies, as well. They are known for engaging in symbiosis with other marine creatures by providing them cleaning service that consists of getting rid of ectoparasites on their bodies. In return, Elacatinus obtain their primary source of food, ectoparasites. (From Wikipedia)
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