28 Nov 2019

At ... a dinosaur skull unearthed in 2015 is causing a problem. It was the skull of a styracosaurus, complete with horns. The differences in the skull's left and right profiles are so extreme they appear to belong to two different animals - but clearly aren't ...

   ... the same story is at Phys Org at ... and was published in Cretaceous Research (2019) - see ... and it seems that some divisions of dinosaurs, previously thought to represent different species, or varieties of the same species, will have to be re-evaluated.