Primitive - Lobe Fins
<gallery>
Image:Pikaia BW.jpg|Name:Pikaia
Time:Middle Cambrian
Group:Chordata
Image:Fishapods.jpg|Teterapods
Primitive - Lobe Fins
<gallery>
Image:Pikaia BW.jpg|Name:Pikaia
Time:Middle Cambrian
Group:Chordata
Image:Fishapods.jpg|Teterapods