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Paleontology nerd here. There isn’t an official term for the tail spikes, but thagomizer is pretty much an unoffcial official term.
I mean… if you don’t have an official term for it, but basically everyone in your field calls it a thagomizer, does that not make thagomizer the official term? If not, what makes a term “official”?
Well, whats the official term? If its just tail spikes I will be very disappointed