窄吻種長期以來沒有經過充分的描述,像是區分出與奧氏種差異的自衍徵、獨有特徵等,直到2011年貝爾(Phil R. Bell)對該物種進行了重新檢視。他在同一年稍早發表的文獻中提到,在1952年羅特傑斯特文斯基以及1981年奧斯穆斯卡和馬瑞沿斯卡(英语:Teresa Maryańska)的研究都沒有提供足夠全面的描述來比較兩物種的差異。[12]
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^ 7.07.17.27.3Horner, 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 0-520-24209-2.
^ 10.010.1Norman, David B.; Sues, Hans-Dieter. Ornithopods from Kazakhstan, Mongolia and Siberia. Benton, Michael J.; Shishkin, Mikhail A.; Unwin, David M.; Kurochkin, Evgenii N. (编). The Age of Dinosaurs in Russia and Mongolia. Cambridge: Cambridge University Press. 2000: 462–479. ISBN 0-521-55476-4.
^ 11.011.1Albert Prieto-Márquez; Jonathan R. Wagner. A new species of saurolophine hadrosaurid dinosaur from the Late Cretaceous of the Pacific coast of North America. Acta Palaeontologica Polonica. 2013, 58 (2): 255–268. doi:10.4202/app.2011.0049.
^ 12.012.112.212.3Bell, P. R. Cranial Osteology and Ontogeny of Saurolophus angustirostrisfrom the Late Cretaceous of Mongolia with Comments on Saurolophus osbornifrom Canada. Acta Palaeontologica Polonica. 2011, 56 (4): 703–722. doi:10.4202/app.2010.0061.
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^Prieto-Márquez, Alberto. Global phylogeny of Hadrosauridae (Dinosauria: Ornithopoda) using parsimony and Bayesian methods. Zoological Journal of the Linnean Society. 2010, 159 (2): 435–502. doi:10.1111/j.1096-3642.2009.00617.x.
^Prieto-Márquez, A.; Wagner, J.R. A new species of saurolophine hadrosaurid dinosaur from the Late Cretaceous of the Pacific coast of North America. Acta Palaeontologica Polonica. 2013, 58 (2): 255–268. doi:10.4202/app.2011.0049.
^Dodson, Peter. Taxonomic implications of relative growth in lambeosaurine dinosaurs. Systematic Zoology. 1975, 24 (1): 37–54. JSTOR 2412696. doi:10.2307/2412696.
^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 0-517-46890-5.
^ 29.029.1Weishampel, David B.; Barrett, Paul M.; Coria, Rodolfo A.; Le Loueff, Jean; Xu Xing; Zhao Xijin; Sahni, Ashok; Gomani, Elizabeth M.P.; Noto, Christopher N. Dinosaur distribution. Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (编). The Dinosauria 2nd. Berkeley: University of California Press. 2004: 517–606. ISBN 0-520-24209-2.
^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.
^Sullivan, R.M. and Lucas, S. G. (2006). "The Kirtlandian land-vertebrate "age"–faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." Pp. 7-29 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.
^Novacek, M. (1996). Dinosaurs of the Flaming Cliffs. Bantam Doubleday Dell Publishing Group Inc. New York, New York. ISBN978-0-385-47775-8