ìCynodontsî
group of therapsids that is closest to mammals
shared characters with mammals:
- loss of lumbar ribs; possible diaphragm
- reduction or loss of all lower jaw bones but one
- zygomatic arch (cheekbone) bowed outwards
- fully developed secondary palate
- calcaneal heel (basically the type of heel you have, in which the calcaneus (heelbone) extends back to form a level arm for the calf muscle)