Evolution of our mammalian ancestor's ear bone

It has long been believed that the hearing bone called stapes, one of the smallest bones in ancestor of mammals, shows no differences between species.

6 Evolution of the inner ear bony housing in mammaliaforms: (A)

Meet Your Mama: First Ancestor of All Placental Mammals Revealed

Evidences for Evolution: The Whales' Tale - BioLogos

PDF] Developmental Patterns in Mesozoic Evolution of Mammal Ears

Fossilized Jaw Bone Reveals Early Evolution of Mammals, Chicago News

29+ Evidences for Macroevolution: Part 1

A bone that aids chewing may have helped start the Age of Mammals

Reptile squamosal quadrate inner ear articular stapes

A complete skull of a stem mammal from the Late Triassic of Brazil illuminates the early evolution of prozostrodontian cynodonts