Editing Corythosaurus (section)

==Classification==
[[File:Corythosaurus cauarius, sub-adult skull and jaws, Dinosaur Provincial Park, Alberta, Canada, Late Cretaceous - Royal Ontario Museum - DSC00026.JPG|thumb|left|ROM 870, the skull of a subadult, originally named as a separate species, ''C. brevicristatus'']] 
Originally, Brown referred to ''Corythosaurus'' as a member of the family [[Trachodontidae]]<ref name="brown1914p559"/> (now Hadrosauridae<ref name="benson2012"/>). Inside Trachodontidae were the subfamilies [[Trachodontinae]] and [[Saurolophinae]]. Brown classified ''[[Hadrosaurus]]'', ''Trachodon'', ''[[Claosaurus]]'', and ''Kritosaurus'' in Trachodontinae,<ref name="brown1914p564"/> whereas he classified ''Corythosaurus'', ''Stephanosaurus'', and ''Saurolophus'' in Saurolophinae.<ref name="brown1914p565"/>

Later, Brown revised the phylogeny of ''Corythosaurus'',  finding that it was closely related and possibly ancestral to ''[[Hypacrosaurus]]''. The only differences he found between them were the development of the vertebrae and the proportions of the legs.<ref name="brown1916p710"/> During a study of dinosaurian ilia in the 1920s, [[Alfred Sherwood Romer]] proposed that the two orders of dinosaurs might have evolved separately and that birds, based on the shape and proportions of their ilia, might truly be specialized ornithischians. He used both ''[[Tyrannosaurus]]'' and ''Corythosaurus'' as a base model to analyze which theory is more likely true. He found that, even though birds are thought of as saurischians, it is very plausible for them to have evolved their specific pelvic musculature and anatomy if they evolved from ornithschians like ''Corythosaurus''.<ref name="romer1923">{{cite journal|last=Romer|first=A.S.|year=1923|title=The Ilium in Dinosaurs and Birds|url=http://digitallibrary.amnh.org/dspace/bitstream/handle/2246/1230//v2/dspace/ingest/pdfSource/bul/B048a05.pdf?sequence=1|journal=Bulletin of the AMNH|volume=48|issue=5|pages=141–145}}</ref> However, even though the pelvic structure of ''Corythosaurus'' and other [[ornithischians]] does bear a greater superficial resemblance to birds than the [[saurischian]] pelvis does, birds are now known to be highly derived [[maniraptoran]] theropods.<ref name="benson2012"/>

''Corythosaurus'' is currently classified as a [[hadrosaurid]] in the [[subfamily]] Lambeosaurinae. It is related to other [[hadrosaurs]] such as ''Hypacrosaurus'', ''[[Lambeosaurus]]'', and ''[[Olorotitan]]''. With the exception of ''[[Olorotitan]]'', they all share similar looking skulls and crests. However, research published in 2003 has suggested that even though it possesses a unique crest, ''[[Olorotitan]]'' is ''Corythosaurus''<nowiki/>'s closest known relative.<ref name="GBA03" /> Benson ''et al.'' (2012) found that ''Corythosaurus'' was closely related to ''[[Velafrons]]'', ''[[Nipponosaurus]]'', and ''Hypacrosaurus'', with them forming a group of fan-crested lambeosaurines.<ref name="benson2012"/>

In 2014, a study including the description of ''[[Zhanghenglong]]'' was published in the journal ''[[PLOS ONE]]''. The study included an almost complete [[cladogram]] of [[hadrosauroidea|hadrosauroid]] relationships, including ''Corythosaurus'' as the most derived lambeosaurine and being the sister taxon to ''Hypacrosaurus''. The below cladogram is a simplified version including only Lambeosaurini.<ref name="zhanghenglong">{{Cite journal | doi = 10.1371/journal.pone.0098821| pmid = 24901454| title = A New Basal Hadrosauroid Dinosaur (Dinosauria: Ornithopoda) with Transitional Features from the Late Cretaceous of Henan Province, China| journal = PLOS ONE| volume = 9| issue = 6| pages = e98821| year = 2014| last1 = Xing | first1 = H. | last2 = Wang | first2 = D. | last3 = Han | first3 = F. | last4 = Sullivan | first4 = C. | last5 = Ma | first5 = Q. | last6 = He | first6 = Y. | last7 = Hone | first7 = D. W. E. | last8 = Yan | first8 = R. | last9 = Du | first9 = F. | last10 = Xu | first10 = X. | pmc=4047018| bibcode = 2014PLoSO...998821X| doi-access = free}}</ref>
[[File:Corythosaurus casuarius, Dinosaur Provincial Park, Alberta, Canada, Late Cretaceous - Royal Ontario Museum - DSC00023.JPG|thumb|ROM 845, mounted [[skeleton]] of ''Corythosaurus cf. intermedius cf. excavatus'' Parks 1935 at the Royal Ontario Museum]] 
{{clade| style=font-size:85%;line-height:85%
|label1=[[Lambeosaurini]]
|1={{clade
 |1=''[[Arenysaurus]]''
 |2={{clade
  |1={{clade
   |1=''[[Sahaliyania]]''
   |2=''[[Amurosaurus]]'' }}
  |2={{clade
   |label1=''[[Lambeosaurus]]''
   |1={{clade
    |1=''[[Lambeosaurus magnicristatus]]''
    |2=''[[Lambeosaurus lambei]]'' }}
   |2={{clade
    |1=''[[Magnapaulia]]''
    |2={{clade
     |1=''[[Velafrons]]''
     |2=''[[Olorotitan]]''
     |3=''[[Nipponosaurus]]''
     |4={{clade
      |label1=''[[Hypacrosaurus]]''
      |1={{clade
       |1=''[[Hypacrosaurus altispinus]]''
       |2=''[[Hypacrosaurus stebingeri]]'' }}
      |label2='''''Corythosaurus'''''
      |2={{clade
       |1='''''Corythosaurus casuarius'''''
       |2='''''Corythosaurus intermedius''''' }} }} }} }} }} }} }} }}