life
see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
crustaceomorphs
see [unranked] Crustaceomorpha Chernyshev, 1960
Eucrustacea Kingsley, 1894
Cephalocarida H.L. Sanders, 1955
see Class Cephalocarida H.L. Sanders, 1955