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Phylogenies (1 of 3) Tree-like not ladder-like

Image caption:
Evolution produces a pattern of relationships A B C D among lineages that is tree-like, not ladder-like.

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Phylogenies (2 of 3) Left to right
Just because we tend to read phylogenies from left to right, there is no correlation with level of "advancement."

Phylogenies (3 of 3) Order doesn't matter
For any speciation event on a phylogeny, the choice of which lineage goes to the right and which goes to the left is arbitrary. These phylogenies are equivalent.