Chordata
Allocryptaspis Whitley, 1940
Americaspis White & Moy-Thomas, 1941
Anglaspis Jaekel, 1927
Ariaspis Denison, 1963
Bryantaspis White & Moy-Thomas, 1940
Cryptaspidisca Strand, 1942
Cryptaspis Bryant, 1934
Cyathaspis Lankester, 1865
Dikenaspis Denison, 1963
Homalaspidella Strand, 1934
Poraspis Kiaer, 1930
Ptomaspis Denison, 1963
Vernonaspis Flower & Wayland-Smith, 1952
