Pachycephalosauridae
One finds, in this, the S:
- Dracorex
- Gravitholus
- Majungatholus
- Micropachycephalosaurus
- Ornatotholus
- Pachycephalosaurus
- Prenocephale
- Stegoceras
- Stygimoloch
- Tylocephale
- Yaverlandia
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