in the former. Specifically, Angistorhinus and Brachysuchus still form a clade, which was found to be the basalmost grouping in Mystriosuchinae. The next diverging group is that of Colossosuchus and the undescribed Indian skulls, of which ISIR271 was found to be the earliest branching of the three. These Indian forms were recovered as sister taxa to a group consisting of the clade formed by Rutiodon and Volcanosuchus and the more derived leptosuchomorphs. The results of the 50% majority rule tree are shown below. Paleobiology The Tiki Formation is known for its diversity and abundance of phytosaur remains. Besides Colossosuchus, it also yielded the smaller Volcanosuchus and a large amount of teeth belonging to a derived species of phytosaur. In addition to these remains from the Tiki Formation, at least two more phytosaurs are known to have lived at the same time in different parts of India. This diverse phytosaur fauna highlights the endemic nature of the group, which generally appears through distinct forms inhabiting restricted ranges, rather than individual genera having a cosmopolitan distribution. Additionally, these Indian taxa are all noted to have survived the early Norian extinction event that effectively caused the disappearance of most non-leptosuchomorph phytosaurs on a global scale. However neither the precise causes of this extinction event or why the Indian phytosaur community survived it are understood. The bonebed that yielded the remains of Colossosuchus may have been formed by the mass death of a family group, consisting of adults performing parental care. References Phytosaurs Prehistoric reptile genera Triassic India Fossils of India Fossil taxa described in 2023