Eric Walker added Sidneyia to Vicissicaudata, and added Vicissicaudata to Artiopoda

Eric Walker added Trilobites to Trilobitomorpha, and added Trilobitomorpha to Artiopoda

Eric Walker added Trilobitomorpha and Vicissicaudata to Artiopoda, and added Artiopoda to Arthropoda

Eric Walker added a number of topics and a number of links to Arthropoda, and added Arthropoda to Ecdysozoa