. MONOCLONES PROTOCIRATOPS From the ancestral type below evolved the first of the "frilled" ceratopsians, Pro focero fops. Evolution in the late horned dinosaurs, as shown above, was marked by varying adap- tations in the horns and frill The probable ancestral type is indicated by the small genus psittacosaurus PSITTACOSAURUS

---

Size: 2150px × 2325px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookpublishernewyork, booksubjectreptilesfossil