WORLD 5 OF 9 · SILURIAN
420 million years ago
A shallow sea at the edge of a nearly bare land.
YOUR LINEAGE
Into the water
Lobe-finned vertebrates: about 420 million years ago.
YOUR JOURNEY · 9 OF 14
Limb bones
One bone, then two, then many: your arm was laid out inside a lobed fin.
Source: Sarcopterygii (Wikipedia)
THE THREAD GOES DEEPER
A skeleton of bone
Bony vertebrates: about 430 million years ago.