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Rank 1, Rank 34, Tap/Click to earn Oxygen - Coggle Diagram
Rank 1
Pikaia
Haikouichthys
Rank 2
Cephalaspis
Rank 4
Tiktaalik
Rank 5
Ichthyostega
Rank 8
1 more item...
Rank 12
1 more item...
Sacabambaspis
Pomatrum
Rank 34
Trilobite
Rank 35
Opabinia
Rank 37
Endoceras
Rank 38
Anomalocaris
Rank 40
Aegirocassis
Rank 43
Brontoscorpio
Rank 45
Eurypterus
Rank 47
Hallucigenia
Rank 49
Arthropleura
Rank 50
Meganeura
Tap/Click to earn
Oxygen