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ABSTRACT
Differences in amount of pigmentation were observed in individuals of Simocephaluesx exspinosus, Simocephalus serrulatus, and Simocephalus vetulus collected from water bodies with or without visually oriented fish. In each species, individuals from permanent waters with fish were more pigmented than were individuals from temporary waters without fish. Pigmentation may reduce the ability of visually oriented predators to detect these crustaceans against structures in benthic habitats.