Eric Walker added Sidneyia inexpectans and Sidneyia - Wikipedia to Sidneyia, and added Sidneyia to Vicissicaudata

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

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