Entity:

Concise hierarchy

Original entries

Ref: J. Liu et al., 2006: 217.

Ref: J. Liu et al., 2006: 217; Howard et al., 2020: fig. S1[d].

Ref: G. Poinar Jr., 2000: table 1 (p. 108).

†*Xenusiida* (Order) Dzik & Krumbiegel, 1989	Ref: J. Liu et al., 2006: 217.
†*Protonychophora* (Order) Hutchinson, 1930	Ref: G. Poinar Jr., 2000: table 1 (p. 108).

2025	Available in Systema Naturae 2000	†2g;2s
1989-present	Systema Naturae 2000: 15 Feb 2022	[; †2g;2s]