Sphenacodontidae

Description: Sphenacodon. Date: 30 April 2007 (original upload date). Source: Transferred from ru.wikipedia to Commons. Author: ДиБгд at Russian Wikipedia.

Description: English: The mandibles of a late late carboniferous synapsid. Date: 15 December 2021. Source: https://royalsocietypublishing.org/doi/10.1098/rsos.211237. Author: Adam K. Huttenlocker, Suresh A. Singh, Amy C. Henrici and Stuart S. Sumida.

Description: Secodontosaurus obtusidens, a pelycosaur from the Early Permian of North America, pencil drawing. Date: 22 July 2007. Source: Own work. Author: Nobu Tamura (http://spinops.blogspot.com). Permission(Reusing this file): All illustrations on this site are copyrighted to Nobu Tamura. The low resolution versions of the images are licensed under Creative Commons Attribution-ShareAlike (CC BY-SA) license meaning that you are free to use them as long as you properly credit the author (© N. Tamura). High resolution versions are available upon request..