Entity:

Concise hierarchy

Original position

Ref: Z. Kielan-Jaworowska et al., 2004: table 6.1 (p. 206).

Ornithorhynchidae (Family) Gray, 1825

Ref: M.C. McKenna & S.K. Bell, 1997: 35.

†*Steropodontidae* (Family) Flannery, Archer, Rich & Jones, 1995	Ref: Z. Kielan-Jaworowska et al., 2004: table 6.1 (p. 206).
*Ornithorhynchidae* (Family) Gray, 1825	Ref: M.C. McKenna & S.K. Bell, 1997: 35.
*Ornithorhynchidae* (Family) Gray, 1825	Ref: R.M. Nowak, 1991: 9.

2024	Available in Systema Naturae 2000	†1s
1989-present	Systema Naturae 2000: 12 Mar 2022	[; †1s]
2004	Z. Kielan-Jaworowska et al.: table 6.1 (p. 206)	[; †1s]