ornamentation, which is replaced by branched ornamentation on the skulltable. Where the nasal bone meets the frontal bone a U-shaped depression can be found. The supratemporal fenestra open dorsolaterally, meaning to the top and side of the skull, and are located below the skulltable. The postorbital-squamosal bar is depressed and oriented down and to the sides, while the parietal-squamosal bar is convex and positioned so that it descends beneath the skull table. The shaft of the mandible is broad, about 59% of the width of the mandibular symphysis. The dentition consists of three parts and is tripartite, meaning several sets of teeth are present. These consist of the large teeth found in the terminal rosette and the distinct premaxillary and maxillary tooth sets. This sets Colossosuchus apart from other basal mystriosuchines and draws parallels to leptosuchomorphs, the only mystriosuchines besides Colossosuchus to feature tripartite dentition. Four teeth were located on either side of the terminal rosette, the first three of which were large and of roughly equal size. The first two tooth pairs are firmly located at the bottom of the snout tip, while the third and fourth pair originate on the side of the bone and are angled slightly outward. The final pair was smaller and followed by three small anterior premaxillary teeth. In general, Colossosuchus had a very high tooth count, with around 57 teeth being present on either side of the upper jaw. The neural arches possess well-developed laminae and fossae, which are similar to those seen in Angistorhinus and both Smilosuchus adamanensis as well as Smilosuchus gregorii. The sacrum consists of three vertebrae, like in Smilosuchus adamanensis and Redondasaurus cf. gregorii. Size The body size of Colossosuchus was determined through the use of multiple different methods. According to prior publications, including Heckert et al. (2021), head to body proportions changed among phytosaurs in their evolutionary history. According to them, basal taxa such as Parasuchus had larger heads, with P. hislopi having a head that makes up 21% of the total length. Later phytosaurs are then hypothesized to have had proportions more similar to modern crocodilians like the saltwater crocodile, only accounting for 13-15% of the total length. Based on this Datta and Ray propose that Colossosuchus would have had more derived proportions which, assuming that the skull makes up 13% of the body length, would yield a maximum length of over . To prevent overestimating the