When trilobites first appear in the fossil record they are already highly diverse and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton an extensive fossil record was left behind, with some 17,000 known species spanning Paleozoic time.
FS-228 Trilobite specimen, with both impressions included. Trilobite approx. 3.75 inches long, entire matrix 6.5 inches long. Trilobite Andalusia, Paleozoic Era, Cambrian Period, approx. 530 million years old. Found in Morocco. To purchase, see below, or simply click on image.