1970年代末至1980年代初,鴨嘴龍被牽扯進分離龍與鉤鼻龍的異名糾紛,尤其是在一些半學術性的恐龍百科。[15][16]大衛·諾曼(英语:David B. Norman)的《恐龍插畫百科》(The Illustrated Encyclopedia of Dinosaurs)中,把加拿大的鉤鼻龍化石稱為分離龍,並將內彎手分離龍的骨架稱為鴨嘴龍。[17]
起初霍納將阿納薩齊龍頭骨歸入納瓦荷分離龍,[23]但杭特及盧卡斯無法從分離龍的有限材料中發現明確的鑑定特徵,而視之為疑名。有鑑於阿納薩齊龍頭骨呈現出獨有衍徵,且與分離龍沒有任何共有衍徵,而得以獨立為新屬新種,[24]後續一些研究支持其論點,[13]但仍受到某些質疑,如托馬斯·威廉森(Thomas E. Williamson)支持霍納原先的解釋;[3]隨後幾項研究則承認兩者各自獨立。[25][26]
一個在墨西哥沙比納斯盆地(Sabinas Basin)發現的部分骨骼於2006年由詹姆斯·I·柯克蘭(英语:James I. Kirkland)等人稱為分離龍未命名種(Kritosaurus sp.),[25]但2013年皮耶妥馬奎茲認為這是櫛龍亞科未定種。[27]該骨骼的體型比其他已知標本大上20%,身長約11公尺,以坐骨彎曲為特徵,成為北美已知體型最大的櫛龍亞科之一。遺憾的是該標本也未能保存完整的吻部。[25]
^ 1.01.11.21.31.4Brown, Barnum. The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus Kritosaurus. Bulletin of the American Museum of Natural History. 1910, 28 (24): 267–274. hdl:2246/1398.
^ 2.02.1Gilmore, Charles W. Contributions to the geology and paleontology of San Juan County, New Mexico. 2. Vertebrate faunas of the Ojo Alamo, Kirtland and Fruitland Formations. United States Geological Survey Professional Paper. 1916, 98–Q: 279–302.
^ 3.03.13.2Williamson, Thomas E. Review of Hadrosauridae (Dinosauria, Ornithischia) from the San Juan Basin, New Mexico. Lucas, S.G.; Heckert A.B. (编). Dinosaurs of New Mexico. New Mexico Museum of Natural History and Science Bulletin, 17. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science. 2000: 191–213.
^ 4.04.1Sinclair, William J.; Granger, Walter. Paleocene deposits of the San Juan Basin, New Mexico. Bulletin of the American Museum of Natural History. 1914, 33 (3): 297–316. Bibcode:1916JG.....24Q.305S. doi:10.1086/622336.
^Creisler, Benjamin S. Deciphering duckbills. Carpenter Kenneth (编). Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Bloomington and Indianapolis: Indiana University Press. 2007: 185–210. ISBN 978-0-253-34817-3.
^Lambe, Lawrence M. On Gryposaurus notabilis, a new genus and species of trachodont dinosaur from the Belly River Formation of Alberta, with a description of the skull of Chasmosaurus belli. The Ottawa Naturalist. 1914, 27 (11): 145–155.
^Parks, William A. The osteology of the trachodont dinosaur Kritosaurus incurvimanus. University of Toronto Studies, Geology Series. 1920, 11: 1–76.
^Prieto–Marquez, Alberto. The braincase and skull roof of Gryposaurus notabilis (Dinosauria, Hadrosauridae), with a taxonomic revision of the genus. Journal of Vertebrate Paleontology. 2010, 30 (3): 838–854. S2CID 83539808. doi:10.1080/02724631003762971.
^ 11.011.1Lull, Richard Swann; Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 164–172.
^ 13.013.113.213.313.4Horner, John R.; Weishampel, David B.; Forster, Catherine A. Hadrosauridae. Weishampel, David B.; Dodson, Peter; Osmólska Halszka (编). The Dinosauria 2nd. Berkeley: University of California Press. 2004: 438–463. ISBN 978-0-520-24209-8.
^Norman, David. B. Hadrosaurids I. The Illustrated Encyclopedia of Dinosaurs: An Original and Compelling Insight into Life in the Dinosaur Kingdom. New York: Crescent Books. 1985: 116–121. ISBN 978-0-517-46890-6.
^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 978-0-517-46890-6.
^Bonaparte, José; Franchi, M.R.; Powell, J.E.; Sepulveda, E. La Formación Los Alamitos (Campaniano-Maastrichtiano) del sudeste de Rio Negro, con descripcion de Kritosaurus australis n. sp. (Hadrosauridae). Significado paleogeografico de los vertebrados. Revista de la Asociación Geológica Argentina. 1984, 39 (3–4): 284–299 (西班牙语).
^Prieto–Marquez, Alberto; Salinas, Guillermo C. A re–evaluation of Secernosaurus koerneri and Kritosaurus australis (Dinosauria, Hadrosauridae) from the Late Cretaceous of Argentina. Journal of Vertebrate Paleontology. 2010, 30 (3): 813–837. S2CID 85814033. doi:10.1080/02724631003763508.
^ 23.023.123.2Horner, John R. Cranial morphology of Prosaurolophus (Ornithischia: Hadrosauridae) with descriptions of two new hadrosaurid species and an evaluation of hadrosaurid phylogenetic relationships. Museum of the Rockies Occasional Paper. 1992, 2: 1–119.
^ 24.024.124.2Hunt, Adrian P.; Lucas, Spencer G. Cretaceous vertebrates of New Mexico. Lucas, S.G.; Zidek J. (编). Dinosaurs of New Mexico. New Mexico Museum of Natural History and Science Bulletin, 2. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science. 1993: 77–91.
^ 25.025.125.225.325.425.5Kirkland, James I.; Hernández-Rivera, René; Gates, Terry; Paul, Gregory S.; Nesbitt, Sterling; Serrano-Brañas, Claudia Inés; Garcia-de la Garza, Juan Pablo. Large hadrosaurine dinosaurs from the latest Campanian of Coahuila, Mexico. Lucas, S.G.; Sullivan Robert M. (编). Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin, 35. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science. 2006: 299–315.
^ 26.026.1Lucas, Spencer G.; Spielman, Justin A.; Sullivan, Robert M.; Hunt, Adrian P.; Gates, Terry. Anasazisaurus, a hadrosaurian dinosaur from the Upper Cretaceous of New Mexico. Lucas, S.G.; Sullivan Robert M. (编). Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin, 35. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science. 2006: 293–297.
^ 27.027.127.227.327.4Prieto-Márquez, A. Skeletal morphology of Kritosaurus navajovius (Dinosauria:Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini. Journal of Systematic Palaeontology. 2013, 12 (2): 133–175. S2CID 84942579. doi:10.1080/14772019.2013.770417.
^Lull, Richard Swann; Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 226.
^Prieto-Márquez, A.; Wagner, J.R. Saurolophus morrisi, a new species of hadrosaurid dinosaur from the Late Cretaceous of the Pacific coast of North America. Acta Palaeontologica Polonica. 2011,. in press. S2CID 55969908. doi:10.4202/app.2011.0049.
^Weishampel, David B.; Barrett, Paul M.; Coria, Rodolfo A.; Le Loeuff, Jean; Xu Xing; Zhao Xijin; Sahni, Ashok; Gomani, Elizabeth, M.P.; and Noto, Christopher R. (2004). "Dinosaur Distribution". The Dinosauria (2nd). 517–606.
^Russell, Dale A. An Odyssey in Time: Dinosaurs of North America. Minocqua, Wisconsin: NorthWord Press, Inc. 1989: 160–164. ISBN 978-1-55971-038-1.
^Lehman, T. M., 2001, Late Cretaceous dinosaur provinciality: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 310-328.
^ 38.038.1Wagner, Jonathan R.; Lehman, Thomas M. A new species of Kritosaurus from the Cretaceous of Big Bend National Park, Brewster County, Texas. Journal of Vertebrate Paleontology. 2001, 21 (3, Suppl): 110A–111A. S2CID 220414868. doi:10.1080/02724634.2001.10010852.
^Sullivan, Robert M.; Lucas, Spencer G. Lucas, Spencer G.; Semken, Steven C.; Berglof, William; Ulmer-Scholle, Dana , 编. The Kirtlandian, a new land-vertebrate "age" for the Late Cretaceous of western North America(PDF). Geology of the Zuni Plateau (New Mexico Bureau of Geology & Mineral Resources 801 Leroy Place Socorro, NM 87801-4796: New Mexico Geological Society). 2003: 369–377 [17 November 2020]. (原始内容存档(PDF)于2022-12-17).
^Sullivan, Robert M. THE KIRTLANDIAN LAND-VERTEBRATE "AGE"—LATE CRETACEOUS OF WESTERN NORTH AMERICA. Geological Society of America Abstracts with Programs. 2004, 36 (4).
^Williamson, Thomas W. Lucas, S. G.; Heckert, A. B. , 编. Review of Hadrosauridae (Dinosauria, Ornithischia) from the San Juan Basin, New Mexico." Dinosaurs of New Mexico. New Mexico Museum of Natural History and Science, Bulletin (1801 Mountain Rd NW, Albuquerque, NM 87104: New Mexico Museum of Natural History and Science). 2000, 17: 191–213.