The urbilaterian (from German ur- 'original') is the unattested last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry. == Appearance == Its appearance is a matter of debate, since no representative has been (or may ever be) identified in the fossil record.
The urbilaterian (from German ur- 'original') is the unattested last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry. == Appearance == Its appearance is a matter of debate, since no representative has been (or may ever be) identified in the fossil record.
Source: Wikipedia "Urbilaterian" · CC BY-SA 4.0
Share this article: X · Bluesky