前上颌侧突(lateral process of premaxilla)的垂直凹槽位于喙(rostral)至上颌背突(dorsal process of maxilla)间,并从前上颌中、侧突(premaxillary medial and lateral processes)之间的小开口向腹侧延伸。
鼻前庭(nasal vestibule)在封闭的前上颌通道吻侧到前上颌背突(premaxillary passages rostral to dorsal process of maxilla)中折叠成S形的环。
成年恐龙的前上颌突从尾背(caudodorsal)延伸至前额。
根据与这些特征的相似性或定义
赖氏龙亚科的特征,将此亚科分为赖氏龙族和副栉龙族。区分部落的另一种方法是通过硬脑膜峰的角度(angle of the dural peak)。 赖氏龙族的角度大于120°,而副栉龙族的角度小于90°。[5]副栉龙族的前骨半规管(anterior semicircular canals)也比赖氏龙族高。[5]
^Evans, David C.; Reisz, Robert R. Anatomy and Relationships of Lambeosaurus magnicristatus, a Crested Hadrosaurid Dinosaur (Ornithischia) from the Dinosaur Park Formation, Alberta. Journal of Vertebrate Paleontology. 2007, 27 (2): 373–393. ISSN 0272-4634. JSTOR 30126306. doi:10.1671/0272-4634(2007)27[373:AAROLM]2.0.CO;2.
^Sullivan, Robert M.; Jasinski, Steven E.; Guenther, Merrilee; Lucas, Spencer G. The first lambeosaurin (Dinosauria, Hadrosauridae, Lambeosaurinae) from the Upper Cretaceous Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico. New Mexico Museum of Natural History and Science Bulletin. 2011, 35: 405–417.
^Takasaki, Ryuji; Chiba, Kentaro; Kobayashi, Yoshitsugu; Currie, Philip J.; Fiorillo, Anthony R. Reanalysis of the phylogenetic status of Nipponosaurus sachalinensis (Ornithopoda: Dinosauria) from the Late Cretaceous of Southern Sakhalin. Historical Biology. 2018-07-04, 30 (5): 694–711. ISSN 0891-2963. doi:10.1080/08912963.2017.1317766.