Renesto "et al." (2010) used modified versions of the matrices from the analyses of Laurin (1991) and Dilkes (1998) in order to determine the phylogenetic position of Drepanosauromorpha within Diapsida. The analyses using Laurin's (1991) matrix recovered drepanosaurs either as the sister group of the clade containing "Prolacerta", "Trilophosaurus" and "Hyperodapedon", i.e. Archosauromorpha, or in unresolved polytomy with Archosauromorpha and Lepidosauromorpha. The analyses using Dilkes's (1998) matrix recovered drepanosaurs either as "protorosaur" archosauromorphs and the sister taxon to the clade containing "Tanystropheus", "Langobardisaurus" and "Macrocnemus", or in unresolved polytomy with Lepidosauromorpha, Choristodera and several archosauromorph clades. Renesto "et al." (2010) concluded that avicephalan synapomorphies proposed by Senter (2004) are merely evolutionary convergences caused by common lifestyle shared by drepanosaurids, coelurosauravids and "Longisquama". The authors did not rule out the possibility that drepanosaurs and "Longisquama" might really be close relatives, but stated that additional data about "Longisquama" needs to be reported to test that.