Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum †Artiopoda Hou & Bergström, 1997
     Superclass †Vicissicaudata Ortega-Hernández, Legg & Braddy, 2013
       1 Genus †Sidneyia Walcott, 1911
       2.1 †Cheloniellida Broili, 1933
       2.2.1 Genus †Emeraldella Walcott, 1912
       2.2.2.1 Genus †Kodymirus Chlupac & Havlicek, 1965
       2.2.2.2.1 Genus †Eozetetes Edgecombe et al., 2017
       2.2.2.2.2 Order †Aglaspidida Walcott, 1911