POMO: "The Midwife of Platonism Text and Subtext in Plato's Theaetetus" by David N. Sedley
(Original Review, 2004-04-02)
Yes, dinosaurs did exist before the name was created by Richard Owen; they were probably known as dragons before in pretty much all myths around the globe. But the dinosaurs themselves only existed in the imagination of people once they were discovered and named by paleontologists.
If you're into stuff like this, you can read the full review.