Cranial bones surrounding temporal fenestra
Dimetrodon † (Mammal-like reptile) and Sphenodon (basal diapsid)
Zero to hero: The synapsid skull
Dimetrodon †
Mammal-like reptile
Thrinaxodon †
Basal cynodont
Virginia Opossum
Didelphis virginiana
Mammal
Dentition
Monito del Monte
Dromiciops gliroides
Skeletal comparison – lizard vs. mammal
Anole lizard
Anolis chlorocyanus
Puma
Puma concolor
But check the platypus skeleton – how is it different?
How do we get dental morphology in monotremes?
Obdurodon †
fossil platypus
Ornithorhynchus anatinus
Platypus
juvenile