Editing Allosaurus (section)

===Synonyms===
[[File:Creosaurus.jpg|thumb|Holotype material of ''Creosaurus atrox'']]
''Creosaurus'', ''Epanterias'', and ''Labrosaurus'' are provisionally regarded as junior synonyms of ''Allosaurus'',<ref name=HMC04/> though the latter two require new analyses to clarify their specific status.<ref name=":2"/> Most of the species that are regarded as synonyms of ''A. fragilis'', or that were misassigned to the genus, are obscure and based on very scrappy remains. One exception is ''Labrosaurus ferox'', named in [[1884 in paleontology|1884]] by Marsh for an oddly formed partial lower jaw, with a prominent gap in the tooth row at the tip of the jaw, and a rear section greatly expanded and turned down.<ref name=OCM84>{{cite journal |last=Marsh |first=Othniel Charles |year=1884 |title=Principal characters of American Jurassic dinosaurs. Part VIII |journal=American Journal of Science |series=Series 3 |volume=27 |issue=160 |pages=329–340 |doi=10.2475/ajs.s3-27.160.329 |url=https://zenodo.org/record/1450066 |bibcode=1884AmJS...27..329M |s2cid=131076004 |archive-date=December 16, 2021 |access-date=June 28, 2019 |archive-url=https://web.archive.org/web/20211216182115/https://zenodo.org/record/1450066 |url-status=live }}</ref> Later researchers suggested that the bone was [[Pathology|pathologic]], showing an injury to the living animal,<ref name=CWG20/> and that part of the unusual form of the rear of the bone was due to plaster reconstruction.<ref name=MW00>{{cite book |last1=Madsen |first1=James H. |last2=Welles, Samuel P. |title=Ceratosaurus (Dinosauria, Theropoda), a Revised Osteology |year=2000 |series=Miscellaneous Publication, '''00-2''' |publisher=Utah Geological Survey }}</ref> It is now regarded as an example of ''A. fragilis''.<ref name=HMC04/>

In his [[1988 in paleontology|1988]] book, ''Predatory Dinosaurs of the World'', the freelance artist & author Gregory S. Paul proposed that ''A. fragilis'' had tall pointed horns and a slender build compared to a postulated second species ''A. atrox'', as well as not being a [[Sexual dimorphism|different sex]] due to rarity.<ref name=GSP88/> ''Allosaurus atrox'' was originally named by Marsh in [[1878 in paleontology|1878]] as the type species of its own genus, ''Creosaurus'', and is based on YPM 1890, an assortment of bones that includes a couple of pieces of the skull, portions of nine tail vertebrae, two hip vertebrae, an [[Ilium (bone)|ilium]], and ankle and foot bones.<ref name=OCM78/> Although the idea of two common Morrison allosaur species was followed in some semi-technical and popular works,<ref name=LG93/> the [[2000 in paleontology|2000]] thesis on Allosauridae noted that Charles Gilmore mistakenly reconstructed USNM 4734 as having a shorter skull than the specimens referred by Paul to ''atrox'', refuting supposed differences between USNM 4734 and putative ''A. atrox'' specimens like DINO 2560, AMNH 600, and AMNH 666.<ref name=DJC00/>

"Allosaurus agilis", seen in Zittel, [[1887 in paleontology|1887]], and Osborn, [[1912 in paleontology|1912]], is a typographical error for ''A. fragilis.''<ref name=DJC00/> "Allosaurus ferox" is a typographical error by Marsh for ''A. fragilis'' in a figure caption for the partial skull YPM 1893<ref name=OCM96>{{cite journal |last=Marsh |first=Othniel Charles|year=1896 |title=The dinosaurs of North America |journal=United States Geological Survey, 16th Annual Report, 1894–95 |volume=55 |pages=133–244}}</ref> and YPM 1893 has been treated as a specimen of ''A fragilis''.<ref name=HMC04/> Likewise, "Labrosaurus fragilis" is a typographical error by Marsh ([[1896 in paleontology|1896]]) for ''Labrosaurus ferox''.<ref name=MW00/> "A. whitei" is a ''[[nomen nudum]]'' coined by Pickering in 1996 for the complete ''Allosaurus'' specimens that Paul referred to ''A. atrox''.<ref name=DJC00/>

"Madsenius" was coined by [[David Lambert (author)|David Lambert]] in [[1990 in paleontology|1990]],<ref>{{cite web |title=MADSENIUS |url=http://www.dinoruss.com:80/de_4/5a8d03b.htm |website=dinoruss.com |access-date=December 18, 2020 |archive-url=https://web.archive.org/web/20080627012337/http://www.dinoruss.com/de_4/5a8d03b.htm |archive-date=June 27, 2008 |date=March 27, 2006 |url-status=live }}</ref> being based on remains from Dinosaur National Monument assigned to ''Allosaurus'' or ''Creosaurus'' (a synonym of ''Allosaurus''), and was to be described by paleontologist [[Robert T. Bakker|Robert Bakker]] as "Madsenius trux".<ref>Lambert, D. (1990) ''The Dinosaur Data Book'', Facts on File, Oxford, England: 320 pp.</ref> However, "Madsenius" is now seen as yet another synonym of ''Allosaurus'' because Bakker's action was predicated upon the false assumption of USNM 4734 being distinct from long-snouted ''Allosaurus'' due to errors in Gilmore's [[1920 in paleontology|1920]] reconstruction of USNM 4734.<ref name="database">{{cite web |title=Carnosauria |url=https://www.theropoddatabase.com/Carnosauria.htm#Allosaurusfragilis |access-date=December 18, 2020 |website=theropoddatabase.com |archive-date=May 13, 2021 |archive-url=https://web.archive.org/web/20210513103854/https://theropoddatabase.com/Carnosauria.htm#Allosaurusfragilis |url-status=live }}</ref>

"Wyomingraptor" was informally coined by Bakker for [[allosaurid]] remains from the [[Morrison Formation]] of the Late [[Jurassic]]. The remains unearthed are labeled as ''Allosaurus'' and are housed in the Tate Geological Museum. However, there has been no official description of the remains and "Wyomingraptor" has been dismissed as a ''nomen nudum'', with the remains referable to ''Allosaurus''.<ref name=database/><ref>Bakker, 1997. Raptor family values: Allosaur parents brought great carcasses into their lair to feed their young. In Wolberg, Sump and Rosenberg (eds). Dinofest International, Proceedings of a Symposium, Academy of Natural Sciences. 51–63.</ref><ref>{{cite web|url=http://dml.cmnh.org/1997Apr/msg00586.html|title=Re: Raptor question|website=dml.cmnh.org|access-date=January 1, 2019|archive-date=June 24, 2021|archive-url=https://web.archive.org/web/20210624195650/http://dml.cmnh.org/1997Apr/msg00586.html|url-status=dead}}</ref>