Newer research strongly indicates that bilateral symmetry evolved before the split between Cnidaria and Bilateria: the radially symmetrical cnidarians have evolved radial symmetry secondarily. This means the bilaterism in species like "N. vectensis" has a primary origin. Also the free-swimming planula larvae of cnidarians exhibit bilateral symmetry. Ctenophores show biradial symmetry.= = = Wangari Maathai = = =
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