is an incomplete skull that was collected at Palo Duro Canyon, Randall County, west Texas, from the Carnian-aged Camp Springs Member of the Tecovas Formation. Later, Long and Murry (1995) referred additional material, including isolated postcranial remains, to P. bransoni from the Carnian-aged Cooper Canyon Formation of the Dockum Group, Howard County, Texas. TMM 31025-172, a complete skull, was collected at Otis Chalk Quarry 1 (also known as SMU 122), TMM 31100-8, 101, 175, 418, 419, 453 were collected at Otis Chalk Quarry 3, and TMM 31185-11, 38 were collected at Otis Chalk Quarry 3A. P. angustifrons P. angustifrons was first described and named by Oskar Kuhn in 1936 as a species of Francosuchus. P. angustifrons is known exclusively from the holotype BSPG 1931 X 502 a partial skull lacking the rostrum and mandibles. It was collected at Ebrach Quarry, bed number 9 of Bavaria, southern Germany, from the late Carnian-aged Blasensandstein Member of the Hassberge Formation. Hunt and Lucas (1991) mistakenly referred to F. angustifrons as Ebrachosuchus angustifrons, and considered it and the other two Francosuchus species, F. broilii and F. latus, to be synonyms of Paleorhinus neukami. More recently, P. neukami was found to be more closely related to Mystriosuchinae than to Paleorhinus and thus the genus Ebrachosuchus was re-validated, while F. angustifrons was reassigned as P. angustifrons as it shares unique synapomorphies with P. bransoni and was found to be its sister taxon. The other two Francosuchus species, were not referred to P. angustifrons because they were found to be nomina dubia as their holotypes were destroyed during World War II. P. cf. arenaceus Dzik & Sulej (2007) assigned several skulls, partial articulated postcranial skeletons, and numerous isolated phytosaur bones in various ontogenetic stages from Krasiejów, Poland to Paleorhinus cf. arenaceus. They found some similarities between the material and P. bransoni and also Ebrachosuchus neukami or F. angustifrons (mistakenly referred to as E. broili), as well as some apparent differences with Parasuchus. The shape of the external mandibular fenestra of the material resembled that of "Zanclodon" arenaceus but it is also shared with the proterochampsid Chanaresuchus bonapartei. "Z." arenaceus was suggested to represent the oldest reliably dated phytosaur, and was reassigned to various phytosaur species over the years, including Belodon, Mystriosuchus and Phytosaurus. Although Hungerbühler (2001) redescribed "Z." arenaceus as not belonging to Phytosauria and referred it to Archosauria incertae sedis, Dzik & Sulej (2007) noted that