THINKING ABOUT DINOSAURS #1: TYRANNOSAURUS REXMore Like This
It’s common paleontological knowledge that Tyrannosaurus rex adults are known from two distinct morphological forms, robust and gracile. I most books and other media, one will often find that the robust morph is suspected to be the female of the species whereas the gracile is the male.
But how accurate are these claims?
I must admit, I’d obeyed this rule for as long I’d known about T.rex, but with Scott Hartman’s reworking of his T.rex skeletal diagrams, I got into thinking deeper about the morphology of the tyrant lizard king.
I know there’s a lot of suggestive evidence that supports the robust=female idea, but I set out to find any hard evidence that points towards this. What I found was that the initial idea came from the length of the chevron on the first caudal vertebrae. In robust morphs this WAS said to be smaller to allow the passage of eggs, and a comparison was made to female crocodiles. However, further reading revealed to me that this analogy i