Revision of the oryctocephalid trilobite genera Arthricocephalus Bergeron and Oryctocarella Tomashpolskaya and Karpinski (Cambrian) from South China and Siberia | Journal of Paleontology | Cambridge Core
10 Different Types Of Trilobites (Identifying Trilobite Fossils) - Rock Seeker
Trilobite Facts: Amazing Animals That Existed Before The Dinosaurs