Another difficulty of determining distinctly dinosaurian features is that early dinosaurs and other archosaurs from the late Triassic are often poorly known and were similar in many ways; these animals have sometimes been misidentified in the literature.
Outra dificultade á hora de determinar as características distintivas dos dinosauros é que os primeiros dinosauros e outros arcosauros do final do Triásico son con frecuencia especies mal coñecidas e moi similares en varios aspectos, polo que estes animais foron ás veces identificados incorrectamente na literatura.