Definition: The term "Gramastacus" is a genus in the family Platyhelminthes, commonly known as flatworms. It consists of two species: Gramastacus fulgens and Gramastacus griseus. These flatworms are found in various parts of the world, including tropical regions like South America, Africa, and Southeast Asia. They are important for aquatic life because they feed on small planktonic animals and other organisms.
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