Hidrozoos
Zoología Características generales Los hidrozoos pueden ser solitarios o coloniales, y éstos pueden ser sésiles o libres. Existen tanto en forma de pólipo como de medusa, y hay formas de agua dulce y de agua salada. Ambas formas presentan células urticantes (cnidoblastos), distribuidas por los tentáculos, que utilizan para capturar presas y como defensa.
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