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Monophyletic clades of mammals

Description
A partial phylogenetic tree of the mammals shows examples of monophyletic groups. Elephants, manatees, and hyraxes form one monophyletic group, tapirs and rhinoceroses form another, and the group of tapirs, rhinoceroses, and horses form a third. However, pachyderms– elephants, rhinoceroses, and hippopotamuses—are not a monophyletic group. Adapted from Murphy et al. (2001).
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