Teyujagua provides a form of transitional morphology between Archosauriformes and other earlier archosauromorphs.
Features previously considered unique to Archosauriformes, including the external mandibular fenestra and serrated teeth, are found in Teyujagua, and demonstrate that the key traits of Archosauriformes were acquired in a mosaic fashion, rather than evolving all at once.
Furthermore, these features broadly relate to dietary adaptations, suggesting that archosauriform skulls were first being adapted for a predatory, hypercarnivorous lifestyle prior to the acquisition of features relating to pneumaticity (e.g. the antorbital fenestra and a closed temporal bar) that characterise later Archosauriformes.

Teyujagua also supports a two-phase radiation model of archosauriform evolution at the end of the Permian and into the Triassic.
The first of these radiations occurred as a phylogenetic diversification during the Lopingian, possibly as a response to the end-Guadalupian extinction event, where archosauriforms evolved as disaster taxa to fill minor predatory roles in Permian ecosystems, alongside their archosauromorph relatives.
The second radiation follows the end-Permian extinction, where archosauriforms increased in size, abundance and species richness, coming to occupy the dominant terrestrial roles in Triassic ecosystems.
The presence of the archosauriform Eorasaurus and proterosuchid Archosaurus in the Late Permian supports the initial diversification model, and Teyujagua provides unique insight to the initial acquisition of traits in their early evolution in the Permian, as the skeletal records for Permian archosauriforms are rare and fragmentary.
Teyujagua provides a form of transitional morphology between Archosauriformes and other earlier archosauromorphs. Features previously considered unique to Archosauriformes, including the external mandibular fenestra and serrated teeth, are found in Teyujagua, and demonstrate that the key traits of Archosauriformes were acquired in a mosaic fashion, rather than evolving all at once. Furthermore, these features broadly relate to dietary adaptations, suggesting that archosauriform skulls were first being adapted for a predatory, hypercarnivorous lifestyle prior to the acquisition of features relating to pneumaticity (e.g. the antorbital fenestra and a closed temporal bar) that characterise later Archosauriformes.
Teyujagua also supports a two-phase radiation model of archosauriform evolution at the end of the Permian and into the Triassic. The first of these radiations occurred as a phylogenetic diversification during the Lopingian, possibly as a response to the end-Guadalupian extinction event, where archosauriforms evolved as disaster taxa to fill minor predatory roles in Permian ecosystems, alongside their archosauromorph relatives. The second radiation follows the end-Permian extinction, where archosauriforms increased in size, abundance and species richness, coming to occupy the dominant terrestrial roles in Triassic ecosystems. The presence of the archosauriform Eorasaurus and proterosuchid Archosaurus in the Late Permian supports the initial diversification model, and Teyujagua provides unique insight to the initial acquisition of traits in their early evolution in the Permian, as the skeletal records for Permian archosauriforms are rare and fragmentary.
Teyujagua