Vertebrates are often presented via the following Classes: Actinopterygii (ray-finned fish), Sarcopterygii (lobe-finned fish), Amphibia (amphibians), Reptilia (lizards, turtles, tuatara), Aves (birds), and Mammalia (mammals). The phylogeny below shows the branching pattern for the extant vertebrates and which lineages are usually included in each Class.
Give at least three different ways that these Class designations fail to present "good" monophyletic clades. For each example, explain your reasoning.
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