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>From: Chartier Michel <firstname.lastname@example.org>
> > Nanotyrannus lancensis (Gilmore 1946) late Maastrichtian, western North
> > America
> > (?= juvenile T. rex?)
> I was pretty convinced that this individual was an adult. Why then
> the doubts about the validity of this taxon?
I feel the same. As I remember it, the skull shows fairly extreme
suturing, which indicates not merely adult, but actually old age.
Also, it has some rather unique anatomical features that place it
a bit out of the "main line" of tyrannosaurid anatomy.
The peace of God be with you.