En Hydra kanske?
"Sea anemones are restricted to ocean habitats, but a few cnidarians of the Class Hydrozoa occur in
freshwater. Hydra are the most common of these and are widespread in clean waters throughout North America."
"Sea anemones are restricted to ocean habitats, but a few cnidarians of the Class Hydrozoa occur in
freshwater. Hydra are the most common of these and are widespread in clean waters throughout North America."
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