Olenoides serratus (trilobite) [Olenoides serratus (trilobite)]

Olenoides serratus (trilobite)

An Olenoides serratus trilobite scurries across a Middle Cambrian ocean floor about 500 million years ago. Olenoides serratus grew to be about four inches long. This trilobite shares the scene with two kinds of diminutive sponge: the smaller branching sponges are from the genus Vauxia, while the larger corrugated tubular sponges are from the genus Wapkia.