<p><strong>Fig. 7.13.</strong> (<strong>A</strong>) Artist sketch of the extinct species <em>Procynosuchus delaharpeae</em>, an early ancestor of modern mammals that lived during the late Paleozoic era.</p>

Fig. 7.13. (A) Artist sketch of the extinct species Procynosuchus delaharpeae, an early ancestor of modern mammals that lived during the late Paleozoic era.

Image courtesy of Nobu Tamura, Wikimedia Commons