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marijn_evers This post is about my research of the forelimbs of the tyrannosauroidea (mostly the tyrannosauridae)

The tyrannosauroidea tribe (most likely) of from thecoelurosauria, a group of theropods with ‘normal sized’ forelimbs.
This means that the forelimbs of the tyrannosauroidea where normal in the beginning of their evolution, but that they slowly evolved away, because they werent useful anymore.
But why werent they?
Probably because their head was evolving bigger, so they could use it as only weapon.
The forelimbs wherent useful anymore, and because they only used energy, they coud evolve away.
If you look at the evolution of the tyrannosauroidea, you see that the forelimbs getting smaller and smaller.
For example, dilong, on of the first tyrannosauroids, had forelimbs with normal proportions (1), but the forelimbs of tarbosaurus, one of the latest tyrannosauroids, where extremely short (2).
But why did they had there forelimbs, if they only costed energy?
There forelimbs would probably evolved away, if they dind’t extinct 65 million years away.
my conclusion; their forelimbs wheren’t useful at al; they where only still there of earlier evolution stages, and where completely out of use.
3d

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