Because of convergent evolution, physical characteristics may be deceptive and lead to unreliable phylogenetic trees.
Phylogenetic trees do not typically take branches into account when calculating time. They show the progression of evolution as well as its differences. After two lineages diverge, phylogenetic trees do not simply grow in one way the evolution of one creature does not necessarily mean the end of the evolution of another.
It's possible that a phylogenetic tree won't show how long it took for hair. The order in which events occurred is what the tree does demonstrate. For instance, the tree in the aforementioned figure demonstrates that the vertebral column is the oldest characteristic.
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