Along with Pampadromaeus, Daemonosaurus nests as the basalmost ornithischian AND sauropodomorph in this segment of the reptile family tree. Due to these relationships with plant-eating clades, Daemonosaurus may have used its over-sized banana-shaped fangs to pull leaves and needles off of twigs.
Paleontologists have always agreed that the plant-eating ornithischians and sauropodomorphs were derived from carninorous ancestors.
Paleontologists have also wondered about those large fangs seen in Heterodontosaurus, Massospondylus and Yinlong. Now the origin of the Phytodinosauria (Sauropodomorpha + Ornithischia) has been illuminated and the mystery behind the large fangs of Heterodontosaurus has been resolved.