Ornithischian pubis anterior process

Obviously one of the big differences between the saurischian and ornithischian dinosaurs is the reversed and backwards pointing pubis of the latter clade. But this doesn’t mean that none of the pelvis (aside from the ilium of course) extends anteriorly. While the ‘arm’ of the pubis might be pointed to the rear, in many taxa there is also an expansion – the anterior process – that extends forwards into the place where the pubis would otherwise lie. Given how tight the arm of the pubic can be to that of the ischium, it’s possible to confuse an ornithischian pelvis for a saurischian one at first glance. There is a big extension forwards where the pubis should be and no immediately obvious posteriorly pointing part, though a quick double check should clear things up.

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