|Along with Nyctiphruretus, Saurorictus was a tiny genus at the base of the Lanthanosuchia, which includes the Lanthanosuchidae, Lepidosauriformes and several former procolophonids including , Sauropareion and the owenettids.
The Lanthanosuchia is defined as Varanus, Saurorictus, their last common ancestor and all of its descendants. So, lizards, pterosaurs and snakes also had a flat-headed phase in their ancestry. The lower temporal fenestra in Macroleter and Lanthanosuchus was homologous with later lateral fenestrae in owenettids, etc.
The Lanthanosuchidae is defined as Macroleter, Lanthanosuchus, their last common ancestor and all of its descendants.