Phylum Arthropoda Siebold, 1848 - arthropods Subphylum †Artiopoda Hou & Bergström, 1997 Superclass †Vicissicaudata Ortega-Hernández, Legg & Braddy, 2013 Order †Aglaspidida Walcott, 1911 Family †Tremaglaspididae Lerosey-Aubril, Zhu & Ortega-Hernández, 2017 Genus †Tremaglaspis Fortey & Rushton, 2003 [paraphyletic] †Tremaglaspis vanroyi Lerosey-Aubril et al., 2013