Additionally, several characteristics once thought to be synapomorphies are now known to have appeared before dinosaurs, or were absent in the earliest dinosaurs and independently evolved by different dinosaur groups.
Ademais, varias características que unha vez se pensou que eran sinapomorfías sabemos agora que en realidade apareceron antes dos dinosauros, ou estaban ausentes nos primeiros dinosauros e evolucionaron independentemente en diferentes grupos de dinosauros.