The Crotalocephalus trilobite is part of a larger group of arthropods that lived in ancient seas. This genus belongs to the order Phacopida, a category of trilobites often recognized by their distinctive compound eyes and ornate exoskeletons. Crotalocephalus trilobites had streamlined, segmented bodies that varied in size but usually measured between 2 to 5 inches long. Their intricate exoskeleton and advanced eye structures made them well-suited for life in their marine habitats.