Flexicalymene refers to a certain species of trilobites found throughout North America, Europe, and North Africa. Flexicalymene (formally known as diacalymene) are an extinct species of trilobite which lived during the Ordovician period, 449 to 443 million. 

Trilobites were prehistoric bottom dwelling marine creatures. They are related to the modern day horse shoe crab. They had a hard exoskeleton body which was conspicuously segmented which enabled them to roll up just as a modern roly- poly. Crotalocephalus is a genus of trilobite that lived from the Late Silurian to the Early Devonian. Its remains have been found in Asia, Australia, Africa, and Europe.

This is a unique, one of a kind, fossil. Once this item is sold, we will not be about to acquire an exact replacement. All Paxton Gate specimens are guaranteed to be of the highest quality; sourced from ethical vendors and private collectors around the world.