 "Dianchungosaurus" was once considered a heterodontosaurid from Asia, but it has since been shown that the remains were a chimera of prosauropod and mesoeucrocodylian remains.José Bonaparte also classified the South American "Pisanosaurus" as a heterodontosaurid at one time, but this animal is now known to be a more basal ornithischian.The membership of Heterodontosauridae is well-established in comparison to its uncertain phylogenetic position.