When trying to restore the proportions of Spinosaurus, the elephant in the room is obviously FSAC-KK 11888, the proposed neotype specimen. When described in 2014 it was purported to resolve most of the mysteries in understanding the proportions and ecology of Spinosaurus, with it shifting from a large, terrestrial bipedal carnivore with a rounded sail to a knuckle-walking aquatic pursuit fish eater with a sigmoid sail (or one with two peaks). Of course there’s been some controversy about each of those claims, and I will weigh in on them in due course. But for today, I want explore sail shape…
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