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> I thought only mammals have differentiated teeth.
This is not strictly true, there are even some heterodont lizards
(some species of varanids, for instance). It is just that mammals
*regularly* have heterodont dentition, and tend to be more *extreme*
in their heterodonty.
> Are there any other
> dinosaurs besides Heterodonts with differentiated teeth? Where did they come
> from and where did they go evolutionarily speaking?
The heterodontosaurids apparently evolved from basal ornithishchians,
and left no known descendents (i.e they were a "dead-end").
However, tyrannosaurids had slightly heterodont dentition, since their
maxillary teeth are quite distinct from their premaxillary teeth,
and the maxillary teeth tend to be larger towards the front.
The peace of God be with you.