| Two key phases in the evolution of South Chinese tracheophyte leaves can be recognized. |
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| Our findings suggest that tracheophyte leaf disparity and diversity were decoupled, and that they were under different selective regimes. |
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| This indicates an expansion of CPK gene family after the divergence of flowering plants from the remainder of the tracheophyte lineage. |
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| A well-documented fossil assemblage includes acanthodian, placoderm, chondrichthyan, and cephalaspid fishes, tracheophyte remains, eurypterids, ostracods, and molluscs. |
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