Urbilaterian
The urbilaterian (< German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.
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The urbilaterian (< German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.
Read more about Urbilaterian.