Clevosaurus sectumsempra

Clevosaurus sectumsempra, also known as Clevosaurus sectumsemper was an extinct reptile from the Muggle world. It lived in Brazil over 205 million years ago and is a namesake to the sectumsempra spell Snape casts.

Discovery
In 2006, several fossils from an animal known as Clevosaurus were dubbed Clevosaurus sectumsempra.