Denise Sigogneau-Russell re-assigned D. quadrata to Aelurognathus (as A. quadrata) in her systematic revision of gorgonopsian taxonomy, thus synonymising the two genera. However, she did not consider von Huene's D. nasuta to belong to Aelurognathus, and instead tentatively referred the species to Arctognathus as Arctognathus? nasuta. Furthermore, Sigogneau (1970) only considered the holotype of D. quadrata from Malawi to belong to Aelurognathus, and she did not consider two additional specimens referred to D. quadrata by von Huene in 1950 from Tanzania (GPIT/RE/7120 and GPIT/RE/7121) to belong to the same species. Instead, she suggested that they may also be referable to Arctognathus? nasuta—in addition to three other Tanzanian specimens (MZC 886, MZC 887, and MZC 876) referred to D. quadrata by Francis Rex Parrington in 1955. Nonetheless, Sigogneau was cautious in the referral of "D." nasuta to Arctognathus, and had previously acknowledged that the referral was not a resolved matter, especially in her opinion that the roof of the skull of "D." nasuta was not well preserved enough for comparison. Later researchers agreed with Sigogneau's doubts and have acknowledged that "D." nasuta does not compare well to Arctognathus. In Eva Gebauer's unpublished 2007 Ph.D. thesis, she argued that "D." nasuta was distinct from other gorgonopsians and belonged to a new genus for which she informally proposed the nomen nudum "Njalila" (named after the Njalila, a tributary of the Rhuhu River in Tanzania). Gebauer further proposed a novel second species of this genus, "N. insigna", based on a skull previously referred to another gorgonopsian, Scylacops capensis. Gebauer differentiated "N. insigna" from "N." nasuta by possessing thicker arches between its skull openings, a posteriorly wider skull, and a slightly more rounded snout profile. In 2014, paleontologist Christian F. Kammerer also agreed that "D." nasuta was not a species of Arctognathus, as well as that the Tanzanian specimens of D. quadrata likely belonged to this same species. However, he was more cautious regarding their taxonomy, noting that Gebauer's proposal of a novel genus required further study of the material and needed to be more rigorously phylogenetically tested first. From this, he urged that the taxon should be referred to as "Dixeya" nasuta until its taxonomy and relations could be resolved (reportedly under study as of 2014). Classification The phylogenetic relationships of "Dixeya" nasuta (as "Njalila") were analysed by Gebauer in 2007 in her unpublished PhD thesis, and was the first computerised phylogenetic analysis of