"That anomaly is the relationship between the rubber and rosy boas. In their tree, the rosy boa is shown to share a more recent common ancestor with the Calabar boa than with the rubber boa."

I think you should look carefully at the tree and think about what sharing a common ancestor means. You might notice that in the phylogeny, Charina forms a monophyletic group. Therefore all Charina share a recent common ancestor, not shared by Eryx. For your statement above to be true, Charina would have to be paraphyletic, which is not what is shown in the tree.

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