<p><strong>Fig. 7.13.</strong>&nbsp;(<strong>B</strong>) Artist sketch of <em>Oligokyphus</em>, an extinct primitive mammal that lived during the mid-Mesozoic era.</p>

Fig. 7.13. (B) Artist sketch of Oligokyphus, an extinct primitive mammal that lived during the mid-Mesozoic era.

Image courtesy of Nobu Tamura, Wikimedia Commons