A 1996 study on dinosaur origins by Fernando Novas also placed a well-preserved femur and tibia (erroneously labelled UPLR 53) within the genus, and this may also be the case with PVL 3455, an indeterminate partial skeleton with some similarities to Arcucci's original material. Despite not sharing much overlapping material, some paleontologists have proposed that Pseudolagosuchus major represented the same species of animal as Lewisuchus admixtus. If this is demonstrated to be the case, the name Lewisuchus would have priority over Pseudolagosuchus due to having been named earlier. Arcucci argued towards synonymizing the two as early as 1997. A 2010 study in the Journal Nature by Nesbitt et al. also made a case for their synonymy, as they were approximately the same size, came from the same locality and strata, and both were found to be basal members of the recently named family Silesauridae. Many other studies supported these arguments, sometimes even scoring the two as a single taxon in their phylogenetic analyses. Several hindlimb, hip, and vertebral fossils (PVL 3456, PULR-V 112 and PULR-V 113) have additionally been referred to Lewisuchus based on their similarity to Pseudolagosuchus remains. However, Bittencourt et al.'s 2014 redescription of the Lewisuchus holotype refrained from synonymizing the two due to a lack of data, with the only overlapping material being the tibia and a few cervical (neck) vertebrae. No unambiguous characteristics were shared between these scraps, and one tibia referred to Pseudolagosuchus (Novas's 'UPLR 53') seemed to have a curvature different from that of Lewisuchus's holotype. A new specimen of Lewisuchus discovered in 2013 was described by Martin Ezcurra et al. in 2019, helping to settle the synonymy debate. This new specimen, CRILAR-Pv 552, was a partial skeleton incorporating parts of the skeleton previously only known in either Lewisuchus (such as the skull) or in Pseudolagosuchus (such as the hip and hindlimbs). It also provided details of the premaxilla, inner ear, and lower forelimbs, which were not preserved in any previous remains. The individual bones of CRILAR-Pv 552 were basically identical to their counterparts in Lewisuchus and Pseudolagosuchus specimens, providing irrefutable evidence that Pseudolagosuchus referred to the same species of reptile as Lewisuchus, and establishing Lewisuchus admixtus as the valid name for all fossils previously referenced with either name. References Silesaurids Late Triassic reptiles of South America Triassic Argentina Fossils of Argentina Chañares Formation Fossil taxa described in 1972 Taxa named by Alfred Romer