images

Trilobite

by

Walter B. Myers/Novapix

Reference

t-glb99-00040

Date

2011-03-24

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.