Exact(5)
Pelycosaurs reached 3.5 metres (about 11.5 feet) in length and had large, differentiated teeth.
They also had differentiated teeth, jaw bones, and jaw muscles suitable for chewing.
This earbone criterion may seem esoteric — until we learn that the evolution of that bone structure is related to the development of a single lower jaw, which in turn, is associated with the fact that mammals, unlike, say, lizards, have differentiated teeth that allow for different kinds of chewing.
Two hundred and fifty million years ago some quadrupeds had differentiated teeth and limbs under their bodies, like mammals, but, like reptiles, they had several bones in their jaw and just one in their ear, and they never stopped growing.
The production of differentiated teeth that fit tightly together is clearly complicated, which may be why mammals and a few dinosaur taxa are the only major groups to have evolved complexly occluding dentitions, most other vertebrates having either simple, conical homodont dentitions or no teeth at all.
Similar(53)
However, several BMPs retain expression in the dentin of the fully patterned and differentiated tooth.
Immunohistochemical analyses confirmed the expression of dentin- and enamel-specific proteins in differentiated bioengineered tooth tissues.
Before cetaceans evolved aquatic adaptations, they had a fully differentiated set of teeth (heterodont dentition), including incisors, canines, premolars, and molars.
Thelodonts are even more closely related to gnathostomes, and this is betrayed by their possession, in addition to a mineralized dermal skeleton and a differentiated stomach, of tooth-like structures associated with their gills.
The differentiated weight of the teeth resulted from analogical differences of the length and total tooth volume of the incisors.
To reduce the number of equations to be solved, the teeth were not differentiated into enamel, dentine, pulp, and cementum but were provided uniformly with the elasticity parameters of dentine.
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