Rare Silurian Trilobite Calymene aff gamachei Trilobites Order Phacopida, Family Calymenidae Geological Time: Early Silurian Million Years Ago) Size: Trilobite is 33 mm long (curve measure) by 18 mm Fossil Site: Jupiter Formation, Northeast Quebec, Canada
Calymenidae - Calymene niagarensis - Calymene niagarensis - Wikipedia, the free encyclopedia Fossils of Calymene niagarensis from Ohio, United States, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Trilobite fossil, Calymene blumenbachii, 014851 by Black Country Museums, via Flickr Black Country Museums Trilobite fossil, Calymene blumenbachii, 014851 More commonly known as the "Dudley Bug". This has been preserved in its rolled up defensive position. Collected at Dudley, West Midlands, UK. From the Silurian Period, 425 million years ago.