Celmus

Celmus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the later part of the Arenig stage of the Ordovician Period,^[1] approximately 471 to 478 million years ago.

Celmus Temporal range: Late Arenig[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Proetida
Genus:	Celmus