Lycosuchus vanderrieti (Broom 1903, BMNH 1647; Lat Permian, 260-255) mya; 23cm skull length, 1.2-2m long). Note the very narrow cranium (there's actually a brain in there!) which provides more room for powerful jaw muscles to drive those long fangs deep into prey. The long rostrum is inherited from a sister to Eotitanosuchus. Lycosuchus was basal to cynodonts like Procynosuchus and ultimately mammals like Megazostrodon.

Abdalodon diastematicus (Kammerer 2016; Late Permian) was originally referred to Procynosuchus delaharpeae. Here tiny Abdalodon nests with the much larger Lycosuchus, suggesting either a juvenile/adult relationship or neotony at the genesis of a major clade. Procynosuchus is a sister to these two.