Definition: Selenothamnus is a species of fish in the family Cichlidae, commonly known as selenophantulas or selenocystids. These fish are primarily found in freshwater streams and lakes around the world, where they live in dense mats of algae and other aquatic plants. They have a distinctive appearance due to their large, silvery white scales, which give them a characteristic "selenite" coloration. Selenothamnus is an important
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