| Part of a series on |
| The Cambrian explosion |
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| Phylogenetic position of the urbilaterian | |||
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The urbilaterian (from German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.
| Part of a series on |
| The Cambrian explosion |
|---|
|
| Phylogenetic position of the urbilaterian | |||
|
The urbilaterian (from German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.