Editing Albertosaurus (section)

==Classification and systematics==
''Albertosaurus'' is a member of the theropod [[family (biology)|family]] Tyrannosauridae, specifically the subfamily Albertosaurinae. Its closest relative is the slightly older ''Gorgosaurus libratus'' (sometimes called ''Albertosaurus libratus''; see below).<ref name=currieetal2003>{{cite journal |last=Currie |first=Philip J. |author2=Hurum, Jørn H|author3=Sabath, Karol |author-link=Philip J. Currie|year=2003 |title=Skull structure and evolution in tyrannosaurid phylogeny |journal=Acta Palaeontologica Polonica | volume=48 |issue=2 |pages=227–234 |url=http://app.pan.pl/archive/published/app48/app48-227.pdf|access-date=May 3, 2009| archive-url= https://web.archive.org/web/20090326062829/http://app.pan.pl/archive/published/app48/app48-227.pdf| archive-date= March 26, 2009 | url-status= live}}</ref> These two species are the only described albertosaurines, but other undescribed species may exist.<ref name=currie2003b>{{cite journal |last=Currie |first=Philip J. |author-link=Philip J. Currie |year=2003 |title=Cranial anatomy of tyrannosaurids from the Late Cretaceous of Alberta |journal=Acta Palaeontologica Polonica |volume=48 |issue=2 |pages=191–226 |url=http://app.pan.pl/archive/published/app48/app48-191.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://app.pan.pl/archive/published/app48/app48-191.pdf |archive-date=October 9, 2022 |url-status=live }}</ref> [[Thomas R. Holtz Jr.|Thomas Holtz]] found ''[[Appalachiosaurus]]'' to be an albertosaurine in 2004,<ref name=holtz2004/> but his more recent unpublished work places it as a basal eotyrannosaurian just outside of Tyrannosauridae,<ref name=holtzdml2005>{{cite web |url=http://dml.cmnh.org/2005Sep/msg00345.html |title=RE: Burpee Conference (LONG) |access-date=June 18, 2007 |last=Holtz |first=Thomas R. |author-link=Thomas R. Holtz Jr. |date=September 20, 2005 |archive-date=April 12, 2016 |archive-url=https://web.archive.org/web/20160412171657/http://dml.cmnh.org/2005Sep/msg00345.html |url-status=live }}</ref> in agreement with other authors.<ref name=carretal2005>{{cite journal |last=Carr |first=Thomas D. |author2=Williamson, Thomas E.|author3=Schwimmer, David R. |year=2005 |title=A new genus and species of tyrannosauroid from the Late Cretaceous (middle Campanian) Demopolis Formation of Alabama |journal=Journal of Vertebrate Paleontology |volume=25 |issue=1 |pages=119–143 |doi = 10.1671/0272-4634(2005)025[0119:ANGASO]2.0.CO;2|s2cid=86243316 |url=http://www.bioone.org/doi/pdf/10.4202/app.2012.0003 }}</ref>

The other major subfamily of tyrannosaurids is Tyrannosaurinae, which includes members like ''[[Daspletosaurus]]'', ''[[Tarbosaurus]]'', and ''Tyrannosaurus''. Compared with the more robust tyrannosaurines, albertosaurines had slender builds, with proportionately smaller skulls and longer bones of the lower legs ([[tibia]]) and feet ([[metatarsal]]s and [[phalanges]]).<ref name=currie2003a/><ref name=currieetal2003/>
[[File:Albertosaurus Clean.png|thumb|upright|Cast in the [[Rocky Mountain Dinosaur Resource Center]] in Woodland Park, Colorado]] 
Below is the cladogram of Tyrannosauridae based on the [[phylogenetic analysis]] conducted by Loewen ''et al.'' in 2013.<ref name=Loewen13>{{Cite journal | last1 = Loewen | first1 = M.A. | author-link = Mark Loewen| last2 = Irmis | first2 = R.B. | author-link2 = Randall B. Irmis| last3 = Sertich | first3 = J.J.W. | author-link3 = Joseph Sertich| last4 = Currie | first4 = P. J. | author-link4 = Philip J. Currie| last5 = Sampson | first5 = S. D. | author-link5 = Scott D. Sampson| year = 2013| title = Tyrant Dinosaur Evolution Tracks the Rise and Fall of Late Cretaceous Oceans | editor-last = Evans | editor-first = David C| editor-link = David C. Evans (paleontologist)| journal = [[PLoS ONE]] | volume = 8 | issue = 11 | pages = e79420 | doi = 10.1371/journal.pone.0079420 | pmid =  24223179| pmc = 3819173| bibcode = 2013PLoSO...879420L | ref = {{sfnRef|Loewen ''et al.''|2013}}| doi-access = free }}</ref>

{{clade| style=font-size:100%; line-height:100%
|label1=[[Tyrannosauridae]]
|1={{clade
   |1={{clade
      |1=''[[Gorgosaurus libratus]]''
      |2='''''Albertosaurus sarcophagus''''' }}
   |label2=[[Tyrannosaurinae]]
   |2={{clade
      |1=[[Dinosaur Park Formation|Dinosaur Park]] [[tyrannosaurid]]
      |2={{clade
         |1=''[[Daspletosaurus torosus]]''
         |2={{clade
            |1=''[[Daspletosaurus horneri]]''
            |2={{clade
               |1=''[[Teratophoneus curriei]]''
               |2={{clade
                  |1=''[[Bistahieversor sealeyi]]''
                  |2={{clade
                     |1=''[[Lythronax argestes]]''
                     |2={{clade
                        |1=''[[Tyrannosaurus rex]]''
                        |2={{clade
                           |1=''[[Tarbosaurus bataar]]''
                           |2=''[[Zhuchengtyrannus magnus]]'' }} }} }} }} }} }} }} }} }} }}