Trinucleidae Hawle & Corda, 1847

Broeggerolithus Bancroft, 1935

Cryptolithus Green, 1832

Deanaspis Hughes, Ingham & Addison, 1975

Lloydolithus Bancroft, 1933

Marrolithus Bancroft, 1929

Nankinolithus P'an, 1956

Ningkianolithus Lu, 1957

Novaspis Whittington, 1941

Onnia Bancroft, 1933

Stapeleyella Whittard, 1955

Tretaspis M'Coy, 1849