Entity:

Concise hierarchy

Subsequent positions

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

Ref: J.R. Paterson et al., 2010: text-fig. 9.

Ref: X. Hou & J. Bergström, 1997: 44. [new position]

†*Nektaspida* (Order) Raymond, 1920	Ref: J.R. Paterson et al., 2010: text-fig. 9.
†*Nectaspidida* (Order) Raymond, 1920, nom. corr.	Ref: X. Hou & J. Bergström, 1997: 112. [new position]

1989-present

Systema Naturae 2000

[; †3g]