Trilobites were the first group of animals in the animal kingdom to develop complex eyes. Cambrian Period (about 500 million years ago). Trilobites lived in marine waters. Some trilobites could swim, and others burrowed or crawled around on muddy sea floors.
Size: Just under 3/8" long
Sterling silver posts and backs
Casts of a genuine Elrathia Kingii Trilobite fossil