Entity:

Concise hierarchy

Subsequent positions

Ref: X. Hou & J. Bergström, 1997: 112. [assumed]

Ref: X. Hou & J. Bergström, 1997: 112. [new position]

Arachnomorpha ([unranked]) Heider, 1913

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

*Arachnomorpha* ([unranked]) Heider, 1913	Ref: J. Bergström & X.-G. Hou, 2003: fig. 4.
†*Artiopoda* (Class) Hou & Bergström, 1997	Ref: X. Hou & J. Bergström, 1997: 112. [new position]

2025	Available in Systema Naturae 2000	†2o;3f;1g;1s
1989-present	Systema Naturae 2000	[; †2o;3f]
1997	X. Hou & J. Bergström	[; †2o;3f]