Ceratopsia Ceratopidae Chasmosaurinae L. Cret. Adult skulls are long and low, up to 1 meter long, and have some features in common with lambeosaurines but lack a swollen, hollow nasal crest. The vertebrae near the base of the tail have high neural spines, a lambeosaurine trait. Theropoda Herrerasauria Herrerasauridae L. Trias. Sauropoda Titanosauria Andesauridae L. Cret.
Some researchers consider the sparse type material nondiagnostic.
Theropoda Carnosauria Allosauridae L. Jura. Theropoda Carnosauria i.s. Segnosauria Segnosauridae L. Cret. See additional comments at Centrosaurus . No other Dinosaurian genus known to me has the tail vertebrae so hexagonal, compressed, and elongated as in Eucercosaurus .