Entity:

Concise hierarchy

Original position

†*Nectaspidida* (Order) Raymond, 1920, nom. corr.
†*Retifaciida* (Order) Hou & Bergström, 1997

†*Acercostraca* (Order) Lehmann, 1955		Ref: X. Hou & J. Bergström, 1997: 112. [assumed]
†*Halicyna* (Order) Gall & Grauvogel, 1967		Ref: X. Hou & J. Bergström, 1997: 112. [assumed]

Ref: J. Bergström & X.-G. Hou, 2003: fig. 4.

Ref: X. Hou & J. Bergström, 1997: 43. [new taxon]

†*Trilobitomorpha* ([unranked]) Størmer, 1944	Ref: J. Bergström & X.-G. Hou, 2003: fig. 4.
†*Artiopoda* (Class) Hou & Bergström, 1997	Ref: X. Hou & J. Bergström, 1997: 112. [new taxon]