在70年代,威廉·莫里斯(William J. Morris)研究發現於墨西哥下加利福尼亞州的大型賴氏龍亞科化石。他在1981年將牠們命名為寬尾賴氏龍(L. laticaudus),莫里斯並沒有明確地將牠們分類於賴氏龍,而是認為牠們極可能是賴氏龍。他根據體型、高而狹窄的尾巴、虛弱的骨盆關節等特徵,將寬尾賴氏龍描述為依水為生的動物[21]。在2012年,寬尾賴氏龍被建立為新屬,巨保羅龍(Magnapaulia)[9]。
如同其他鴨嘴龍科,賴氏龍是種大型的草食性動物,可採二足或四足方式行走,複雜的頭部可做出研磨的動作,類似哺乳類的咀嚼。牠們的牙齒是不斷生長、取代的,構成每群至少百顆的齒系,但同一時間只會使用少部份牙齒。賴氏龍使用喙狀嘴切割植物,並置於嘴部兩旁的頰部空間。牠們以離地面約4公尺以下的植被為食[3]。羅伯特·巴克(Robert T. Bakker)指出,賴氏龍亞科的喙狀嘴比鴨嘴龍亞科的狹窄,顯示賴氏龍與其近親的進食內容較鴨嘴龍亞科更為限制[31]。
^ 2.02.12.2(英文)Evans, David C.; Forster, Catherine F.; and Reisz, Robert R. The type specimen of Tetragonosaurus erectofrons (Ornithischia: Hadrosauridae) and the identification of juvenile lambeosaurines. Currie, Phillip J., and Koppelhus, Eva (编). Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Bloomington: Indiana University Press. 2005: 349-366. ISBN 0-253-34595-2.引文使用过时参数coauthors (帮助)
^ 3.03.13.23.33.43.53.63.73.8(英文)Horner, John R.; Weishampel, David B.; and Forster, Catherine A. Hadrosauridae. Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.) (编). The Dinosauria 2nd. Berkeley: University of California Press. 2004: 438-463. ISBN 0-520-24209-2.引文使用过时参数coauthors (帮助)
^(英文)Lull, Richard Swann; and Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 193–194.引文使用过时参数coauthors (帮助)
^ 5.05.15.25.35.4(英文)Evans, David C.; and 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. doi:10.1671/0272-4634(2007)27[373:AAROLM]2.0.CO;2.引文使用过时参数coauthors (帮助)
^(英文)Lull, Richard Swann; and Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 227–228.引文使用过时参数coauthors (帮助)
^(英文)Lull, Richard Swann; and Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 112–117.引文使用过时参数coauthors (帮助)
^(英文)Sullivan, R., Jasinsky, S.E., Guenther, M. and Lucas, S.G. (2009). "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, 53: 405-417. [1] (页面存档备份,存于互联网档案馆)
^ 9.09.1(英文)Prieto-Márquez, A.; Chiappe, L. M.; Joshi, S. H. (2012). Dodson, Peter. ed. "The lambeosaurine dinosaur Magnapaulia laticaudus from the Late Cretaceous of Baja California, Northwestern Mexico". PLoS ONE 7 (6): e38207. doi:10.1371/journal.pone.0038207
^ 10.010.1(英文)Lambe, Lawrence M. On Vertebrata of the mid-Cretaceous of the Northwest Territory. 2. New genera and species from the Belly River Series (mid-Cretaceous). Contributions to Canadian Paleontology. 1902, 3: 25–81.
^(英文)Lambe, Lawrence M. On a new genus and species of carnivorous dinosaur from the Belly River Formation of Alberta, with a description of the skull of Stephanosaurus marginatus from the same horizon. Ottawa Naturalist. 1914, 28: 13–20.
^(英文)Parks, William A. Corythosaurus intermedius, a new species of trachodont dinosaur. University of Toronto Studies, Geological Series. 1923, 15: 1–57.
^(英文)Lull, Richard Swann; and Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 178–187.引文使用过时参数coauthors (帮助)
^(英文)Osborn, Henry Fairfield. Distinctive characters of the mid-Cretaceous fauna. 1. New genera and species from the Belly River Series (mid-Cretaceous). Contributions to Canadian Paleontology. 1902, 3: 1–21.
^(英文)Matthew, William Diller. Canadian dinosaurs. Natural History. 1920, 20 (5): 1–162.
^(英文)Parks, William A. A new genus and two new species of trachodont dinosaurs from the Belly River Formation of Alberta. University of Toronto Studies, Geological Series. 1931, 31: 1–11.
^ 17.017.1(英文)Sternberg, Charles M. Hooded hadrosaurs of the Belly River Series of the Upper Cretaceous. Canada Department of Mines Bulletin (Geological Series). 1935, 77 (52): 1–37.
^(英文)Lull, Richard Swann; and Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 1–242.引文使用过时参数coauthors (帮助)
^(英文)Parks, William A. New species of trachodont dinosaurs from the Cretaceous formations of Alberta. University of Toronto Studies, Geological Series. 1931, 37: 1–45.
^Lund, E.K. and Gates, T.A. (2006). "A historical and biogeographical examination of hadrosaurian dinosaurs." Pp. 263- in Lucas, S.G. and Sullivan, R.M. (eds.), Late Cretaceous vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35.
^(英文)Weishampel, David B.; Barrett, Paul M.; Coria, Rodolfo A.; Le Loeuff, Jean; 徐星; 趙喜進; Sahni, Ashok; Gomani, Elizabeth, M.P.; and Noto, Christopher R. (2004). "Dinosaur Distribution", in The Dinosauria (2nd), pp. 517–606.
^(英文)Eberth, David A. 2005. "The geology", in Dinosaur Provincial Park, pp. 54–82.
^(英文)Braman, Dennis R., and Koppelhus, Eva B. 2005. "Campanian palynomorphs", in Dinosaur Provincial Park, pp. 101–130.
^(英文)Norman, David B. Hadrosaurids II. The Illustrated Encyclopedia of Dinosaurs: An Original and Compelling Insight into Life in the Dinosaur Kingdom. New York: Crescent Books. 1985: 122–127. ISBN 0-517-468905.