Lystrosauridae is thought to be the most closely related group (sister taxon) to Kannemeyeriiformes, and since the earliest lystrosaurids are known from the Late Permian, the divergence of these two groups must have occurred at least as far back as this time, implying that a long ghost lineage must exist.

[1] Although no kannemeyeriiforms have been found in the Late Permian yet, the recent discovery of Sungeodon helps fill a gap in the early fossil record of the group by showing that kannemeyeriiforms diversified right after the Permian-Triassic extinction event.

[2] Four families have been included in the group: Kannemeyeriidae, Shansiodontidae, Stahleckeriidae, and Dinodontosauridae.

[4] Recent phylogenetic analyses suggest that these families represent similar body plans or morphotypes rather than true evolutionary groupings.

[1] Below is a cladogram from Szczygielski & Sulej (2023):[5] Rhinodicynodon Tetragonias Shansiodon Vinceria Dinodontosaurus Dolichuranus Acratophorus Rabidosaurus Wadiasaurus Sinokannemeyeria Parakannemeyeria Xiyukannemeyeria Rhadiodromus Shaanbeikannemeyeria Kannemeyeria Rechnisaurus Uralokannemeyeria Angonisaurus Woznikella Stahleckeriidae This Anomodont-related article is a stub.