Amniotes figure 43-2

This phylogenetic diagram reflects hypotheses about the evolutionary relationships among mammals and other vertebrates. Mammals are thought to have descended from four-legged, land-dwelling vertebrates known as therapsids, which are sometimes referred to as mammal-like reptiles.

figure 43-3

This synapsid had a sail-like structure on its back. Scientists think that this structure was filled with blood vessels that may have helped regulate the animal's body temperature. This illustration was made based on information from the fossil record.

Dimetrodon sp.

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