diandongosuchus is an extinct genus of archosauriform reptile, possibly a member of the phytosauria, known from the middle triassic of china. the type species diandongosuchus fuyuanensis was named in 2012 from the falang formation of yunnan province. it is a marine species that shows similarities with another chinese triassic species called "qianosuchus mixtus", although it has fewer adaptations toward marine life. it was originally classified as the basal-most member of the pseudosuchian clade poposauroidea. however, a subsequent study conducted by stocker "et al." (2016, 2017) indicated it to be the basalmost known phytosaur instead.