Ceratonurus

Ceratonurus is a genus of extinct odontopleurid trilobites that lived during the Devonian period. It is highly recognizable among fossil collectors due to its heavily spined exoskeleton and distinct tail section. Fossils of this species are primarily discovered in Devonian-aged rocks across Europe.

Like many odontopleurid trilobites, Ceratonurus possessed a highly elongated pygidium (tail shield) covered in prominent, sharp terminal spines. Paleontologists believe these extensive spines served as a defensive mechanism against predators, making the animal difficult to swallow. They may have also helped the creature navigate the muddy ocean floor.

Ceratonurus fossils are primarily excavated from Devonian marine deposits located throughout Europe. Significant specimens are frequently unearthed in regions known for rich trilobite deposits, such as Germany and the Czech Republic. The exquisite preservation of their spines in these rocks makes them highly prized.

The Ceratonurus trilobite lived approximately 419 to 359 million years ago during the Devonian period. This era is often referred to as the "Age of Fishes," though marine invertebrates like trilobites still thrived in reef ecosystems. They eventually went extinct along with many other marine species during the Late Devonian mass extinction.