We study trilobites from four periods of the Palaeozoic: the Cambrian, Ordovician, Silurian and Devonian. Our research covers trilobite taxonomy, phylogeny, functional morphology, biogeography, and ...

Trilobites were extinct arthropods ... though on the best examples there were hints of gills and multiple jointed legs. What made them a great fossil-find was their three-lobed exoskeleton ...