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Part 1/3 of my Pachycephalosaurs project for the Pacific Science Center:
"For many dinosaurs, each growth stage came with striking characteristics. This has led to a great deal of taxonomic confusion, as early paleontologists assumed dinosaurs would be more like lizards (the young were simply tiny versions of adults). Tyrannosaurus juveniles had much longer legs compared to adults, and Triceratops had distinct horn and frill shapes for each part of its life. In many of these cases, each growth stage was given its own genus and species upon initial discovery. Three distinct morph of dome-headed dinosaurs, or Pachycephalosaurs, lived in the same environment at the end of the cretaceous: named Dracorex, Stygymolach, and Pachycephalosaurus. There is now general concensus among paleontologists that these three were all Pachycephalsaurus, respectively representing juvenile, subadult, and adult growth stages. Pachycephalosaurus was the largest of the dome-headed dinosaurs. It was an herbivore which thrived at the very end of the age of dinosaurs."
Cheers!
-Keenan
"For many dinosaurs, each growth stage came with striking characteristics. This has led to a great deal of taxonomic confusion, as early paleontologists assumed dinosaurs would be more like lizards (the young were simply tiny versions of adults). Tyrannosaurus juveniles had much longer legs compared to adults, and Triceratops had distinct horn and frill shapes for each part of its life. In many of these cases, each growth stage was given its own genus and species upon initial discovery. Three distinct morph of dome-headed dinosaurs, or Pachycephalosaurs, lived in the same environment at the end of the cretaceous: named Dracorex, Stygymolach, and Pachycephalosaurus. There is now general concensus among paleontologists that these three were all Pachycephalsaurus, respectively representing juvenile, subadult, and adult growth stages. Pachycephalosaurus was the largest of the dome-headed dinosaurs. It was an herbivore which thrived at the very end of the age of dinosaurs."
Cheers!
-Keenan
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Comments23
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I personally side with the opinion they were all distinct, at least with Stygimoloch and Pachycephalosaurus, because while the spikes may have fused to form the dome, Pachycephalosaurus skulls tend to be more knobby rather than having the very distinctive spikes of Stygimoloch.