Barbarian
Member
- Jun 5, 2003
- 33,356
- 2,560
The earliest identified bilateran (bilaterally symmetrical) animal dates at least 550 million years old:
The classification of Kimberella is important for scientific understanding of the Cambrian explosion: if it was a mollusc or at least a protostome, the protostome and deuterostome lineages must have diverged significantly before 555 million years ago. Even if it was a bilaterian but not a mollusc, its age would indicate that animals were diversifying well before the start of the Cambrian.
https://en.wikipedia.org/wiki/Kimberella
The classification of Kimberella is important for scientific understanding of the Cambrian explosion: if it was a mollusc or at least a protostome, the protostome and deuterostome lineages must have diverged significantly before 555 million years ago. Even if it was a bilaterian but not a mollusc, its age would indicate that animals were diversifying well before the start of the Cambrian.
https://en.wikipedia.org/wiki/Kimberella