Phytosaurs are an extinct group of large semi-aquatic Late Triassic archosauriform reptiles. Phytosaurs belong to the family Phytosauridae and the order Phytosauria. Phytosauria and Phytosauridae are often considered to be equivalent groupings containing the same species, but some studies have identified non-phytosaurid phytosaurians. Phytosaurs were similar to the modern crocodilians in appearance, but they had some structural differences, most noticeably - the nostrils that were located before their eyes, rather than at the tips of their snouts.