Description of Metachaos

Locomotive form usually between 75 and 500 µm in length. Pseudopodia cylindrical and smooth with clear hyaline zone. Cytoplasm often very granular with bipyramidal, or irregular crystals. Nucleus discoid or spherical. Uroid morulate and temporary. Distinguish from Polychaos. Freshwater and marine. Type species: M. discoides (Schaeffer, 1916).