# Dinosaurs

## Debate

There is currently a raging debate as to whether certain dinosaurs, now recognized as different species, were merely different developmental stages of single species.

### Comparison

#### Triceratops

• Solid neck frill

#### Both

• Ceratopsians
• Three facial horns
• Herbivorous

#### Torosaurus

• One hollow on either side of neck frill

### Repercussions for Dinosaur Diversity

If certain dinosaurs were indeed merely different developmental stages of a single species, then the biodiversity of dinosaurs would have been much less than our current predictions.

### List of Dinosaurs to Which This Possibly Applies

 $Mature Triceratops$ $=$ $Torosaurus$ $Juvinile Dracorex$ $=$ $Stygimoloch$ $Mature Stygimoloch$ $=$ $Pachycephalosaurus$

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