A bird-like pubis arrangement, parallel to the vertebral column, evolved independently three times in dinosaur evolution, namely in the ornithischians, therizinosauroids and bird-like dromaeosaurids.

Despite losing most of their effectiveness, dinosaur evolution had not yet removed the these digits to fully streamline the foot.

This removed dinosaurs from playing a central role in debates about the origin of living species, and may have contributed to the decline of academic interest in dinosaur evolution.

Some consider it a saurischian dinosaur close to the beginnings of dinosaur evolution, while others consider it a dinosauromorph, an archosaur near the evolution of the dinosaurs.