What is the definition of Fracastorius?

Let's break down this peculiar word, 'Fracastorius', like a baker explaining the science behind a sourdough starter. Picture this: Fracastorius is a genus of extinct, armored, spiky creatures that lived during the Permian period, around 290 million years ago. They were like prehistoric, armored, spiky, and utterly terrifying lizards. Now, imagine a sentence that takes the term to an unsettling level: "The Fracastorius roamed the supercontinent Pangea, wielding its quills like a medieval jousting sword, but instead of slaying dragons, it just preferred to choke the life out of unsuspecting amphibians with its armored back!" It's a vivid image, but remember, in the real world, these creatures didn't have jousting skills or chokeholds.