| Former rank | : | †Symmetrodonta (Legion) Simpson, 1925 | |
Ref: A.O. Averianov & A.V. Lopatin, 2011: 34. [inferred] |
| Former rank | : | †Symmetrodonta (Superorder) Simpson, 1925 | |
Ref: A.O. Averianov & A.V. Lopatin, 2011: 34. [inferred] |
| Former rank | : | †Symmetrodonta (Order) Simpson, 1925 | |
Ref: A.O. Averianov & A.V. Lopatin, 2011: 34. [inferred] |