User blog comment:Dinosaurus1/I thought of something for Sinoceratops and Pachyrhinosaurus./@comment-31757904-20181013224202

But can it be that Mattel's Pachyrhinosaurus  is the feminine version of Sinoceratops? Hence, it is called Sinoceratops. It could fit perfectly with the canon, since the male Sinoceratops had their long horn between their eyes and nose while, on the other hand, the females had that enormous bone mass or lump on their face.