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Re: they keep on growing despite early fusion
In a nutshell, Jessica Maisano found early fusion of many skeletal
elements, yet major growth continued in certain squamates.
But did she find the opposite -- lack of fusion in individuals that had
stopped growing significantly? The abstract mentions this for the braincase
of iguanians, but complete fusion of the braincase is pretty extreme
anyway -- not many taxa ever do that.
Also note that nothing is said about histological criteria, including
external ones ("juvenile texture" of bone surfaces).
Still strange, though, that growth goes on after the epiphyses fuse to the
diaphyses. It used to be textbook wisdom that the whole point of the
separate ossification of the epiphyses is (more or less) determinate growth,