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Berbagai karakteristik kerangka lainnya juga dimiliki oleh dinosaurus. Namun, karena karakteristik tersebut hanya dimiliki oleh kelompok archosaurus atau tidak terdapat pada semua spesies awal dinosaurus, karakteristik tersebut tidak dianggap sebagai sinapomorfi. Misalnya, sebagai anggota [[diapsida]] reptil, keturunan dinosaurus memiliki dua pasang [[fenestra sementara]] (pada tengkorak di belakang mata), sedangkan sebagai anggota diapsida archosauria, dinosaurus memiliki fenestra tambahan pada [[fenestra antorbital|moncong]] dan rahang bawah.<ref name=TRHJ00/> Selain itu, beberapa karakteristik yang sebelumnya dianggap sebagai sinapomorfi diketahui telah muncul sebelum keberadaan dinosaurus, atau tidak terdapat pada dinosaurus awal dan baru berevolusi pada kelompok dinosaurus yang berbeda. Ini termasuk [[skapula]] yang memanjang, atau [[tulang belikat]]; [[sacrum]] yang terdiri dari tiga ruas atau lebih yang menyatu dengan [[tulang punggung]] (tiga pada archosaurus, namun hanya dua pada ''[[Herrerasaurus]]'');<ref name=MJB04dino/> dan sebuah [[Acetabulum|acetabulum berongga]], atau sendi panggul, dengan sebuah lubang di tengah permukaan bagian dalamnya (menutup pada ''[[Saturnalia (dinosaurus)|Saturnalia]]'').<ref name="UC Berkeley Journal of Earth Sciences">{{cite web|last=Smith|first=Dave|title=Dinosauria Morphology|url=http://www.ucmp.berkeley.edu/diapsids/dinomm.html|publisher=UC Berkeley|accessdate=21 January 2013}}</ref><ref name=LARB99/> Kesulitan lainnya untuk menentukan karakteristik Dinosaurian terletak pada fakta bahwa kelompok dinosaurus awal dan archosaurus lainnya yang berasal dari periode Triassic Akhir kurang diketahui dan serupa dalam banyak hal, sehingga hewan-hewan ini terkadang salah diidentifikasi dalam berbagai literatur.<ref name=NIP07/>
 
Dinosaurus berdiri tegak seperti sebagian besar [[Evolusi mamalia|mamalia modern]], namun berbeda dari kebanyakan [[reptil]], yang bergerak melata atau merayap.<ref name=Holland1909>This was recognized not later than 1909: {{cite web |title=Dr. Holland and the Sprawling Sauropods |url=http://web.archive.org/web/20110612180650/http://www.hmnh.org/library/diplodocus/holland1910.html}} The arguments and many of the images are also presented in {{cite book |title=Hot Blooded Dinosaurs |first=A. |last=Desmond |authorlink=Desmond |publisher=DoubleDay |year=1976 |isbn=0-385-27063-1}}</ref> Hal ini disebabkan oleh berkembangnya reses lateral di bagian panggul (biasanya berupa sendi terbuka) yang terhubung ke tulang paha.<ref name=MJB00/> Postur tegak ini memungkinkan dinosaurus purba untuk bernapas dengan mudah sambil bergerak, yang tingkat stamina dan aktivitasnya jauh lebih besar jika dibandingkan dengan reptil melata lainnya.<ref name=RC05/> Tungkai tegak ini kemungkinan juga membantu mendukung [[evolusi]] dinosaurus yang berukuran besar dengan mengurangi kelenturan pada anggota badan.<ref name=TKMB07/> Beberapa achosaurus non-dinosaurus, termasuk [[rauisuchia]], juga bertungkai tegak, namun tegaknya tidak sempurna (tegak semi atau tegak pilar); tulang panggul bagian atas diputar sehingga kaki depan menggantung.<ref name=TKMB07/>
 
== Sejarah evolusi ==
{{reflist|3|refs=
<ref name=Owen1842>{{cite book|author=Owen, R|year=1842|url=http://books.google.com/?id=dy5LAAAAYAAJ&pg=PA60|title=Report on British Fossil Reptiles." Part II. ''Report of the Eleventh Meeting of the British Association for the Advancement of Science; Held at Plymouth in July 1841|place= London|publisher=John Murray|pages=60–204}}</ref>
<ref name=LSJ>{{cite web|url=http://www.perseus.tufts.edu/cgi-bin/lexindex?lookup=deino/s&lang=greek&doc=Perseus:text:1999.01.0169&formentry=0|title=Liddell–Scott–Jones Lexicon of Classical Greek |accessdate=2008-08-05}}</ref>
<ref name=FBS97>{{cite book|author=Farlow, J.O., and Brett-Surman, M.K.|year=1997|chapter=Preface |editor=Farlow, J.O., and Brett-Surman, M.K. (eds.) |title=The Complete Dinosaur|publisher=Indiana University Press|pages=ix–xi|isbn=0-253-33349-0}}</ref>
<ref name=MJB04dino>{{cite book |last=Benton |first=Michael J. |authorlink=Michael J. Benton |editor=Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.)|title=The Dinosauria |edition=2nd |year=2004|publisher=University of California Press |place=Berkeley |isbn=0-520-24209-2 |pages=7–19 |chapter=Origin and relationships of Dinosauria}}</ref>
<ref name=olshevsky2000>{{cite journal |last1 = Olshevsky |first1 = G. |year = 2000 |title = An annotated checklist of dinosaur species by continent |journal = Mesozoic Meanderings |volume = 3 |pages = 1–157 }}</ref>
<ref name=Sereno2005>{{cite journal|author=[[Paul Sereno|Sereno, P.]]|title=The logical basis of phylogenetic taxonomy|journal=[[Systematic Biology]]|year=2005|volume=54|issue=4|pages=595–619|doi=10.1080/106351591007453|pmid=16109704}}</ref>
<ref name=KP04>{{cite book|author=Padian K|year=2004|publisher=University of California Press|chapter=Basal avialae|title=The Dinosauria (2d edition)|editor=Weishampel DB, Dodson P, Osmólska H |pages=210–231|isbn=0-520-24209-2}}</ref>
<ref name=DFG97>{{cite book |last=Glut |first=Donald F. |authorlink=Donald F. Glut |title=Dinosaurs: The Encyclopedia |year=1997 |publisher=McFarland & Co |place=Jefferson, North Carolina |page=40 |isbn=0-89950-917-7}}</ref>
<ref name=DL90>{{cite book |last=Lambert |first=David |author2=the Diagram Group |title=The Dinosaur Data Book |year=1990 |publisher=Avon Books |place=New York |isbn=0-380-75896-2 |page=288}}</ref>
<ref name=MM97>{{cite book |last=Morales |first=Michael |editor=Farlow JO, Brett-Surman MK |title=The Complete Dinosaur |year=1997 |publisher=Indiana University Press |place=Bloomington |isbn=0-253-33349-0 |pages=607–624 |chapter=Nondinosaurian vertebrates of the Mesozoic }}</ref>
<ref name=Wang&Dodson>{{cite journal|author=Wang, S.C., and Dodson, P. |year=2006|title=Estimating the Diversity of Dinosaurs|journal=Proceedings of the National Academy of Sciences USA|volume=103|issue=37|pages=13601–13605|pmid= 16954187|doi=10.1073/pnas.0606028103|pmc=1564218|bibcode = 2006PNAS..10313601W }}</ref>
<ref name=russell1995>{{cite journal|author=Russell, Dale A.|year=1995|title=China and the lost worlds of the dinosaurian era|journal=Historical Biology|volume=10|pages=3–12|doi=10.1080/10292389509380510}}</ref>
<ref name=AmosBBC>{{cite news |author=Amos J|url=http://news.bbc.co.uk/2/hi/science/nature/7620621.stm |title=Will the real dinosaurs stand up? |work= BBC News|accessdate=2011-03-23 |date=2008-09-17}}</ref>
<ref name=MacLeod>{{cite journal|author=MacLeod, N, Rawson, PF, Forey, PL, Banner, FT, Boudagher-Fadel, MK, Bown, PR, Burnett, JA, Chambers, P, Culver, S, Evans, SE, Jeffery, C, Kaminski, MA, Lord, AR, Milner, AC, Milner, AR, Morris, N, Owen, E, Rosen, BR, Smith, AB, Taylor, PD, Urquhart, E & Young, JR|title=The Cretaceous–Tertiary biotic transition|year=1997|journal=Journal of the Geological Society|volume=154|issue=2|pages=265–292|doi=10.1144/gsjgs.154.2.0265}}</ref>
<ref name=RMetal10>{{cite journal |last=Amiot |first=R. |coauthors=Buffetaut, E.; Lécuyer, C.; Wang, X.; Boudad, L.; Ding, Z.; Fourel, F.; Hutt, S.; Martineau, F.; Medeiros, A.; Mo, J.; Simon, L.; Suteethorn, V.; Sweetman, S.; Tong, H.; Zhang, F.; and Zhou, Z. |year=2010 |title=Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods |journal=Geology |volume=38 |issue=2 |pages=139–142 |doi=10.1130/G30402.1}}</ref>
<ref name=nesbitt2011>{{cite journal |author = Nesbitt S.J. |year = 2011 |title = The early evolution of archosaurs: relationships and the origin of major clades |journal = Bulletin of the American Museum of Natural History |volume = 352|pages = 1–292 |doi=10.1206/352.1}}</ref>
<ref name=TRHJ00>{{cite book|author=Holtz, Jr., T.R. |year=2000|chapter=Classification and evolution of the dinosaur groups |editor=Paul, G.S. |title=The Scientific American Book of Dinosaurs|publisher=St. Martin's Press|pages=140–168|isbn=0-312-26226-4}}</ref>
<ref name=LARB99>{{cite journal|author=Langer, M.C., Abdala, F., Richter, M., and Benton, M.J. |year=1999|title=A sauropodomorph dinosaur from the Upper Triassic (Carnian) of southern Brazil|journal=Comptes Rendus de l'Academie des Sciences, Paris: Sciences de la terre et des planètes|volume=329|pages=511–517|bibcode=1999CRASE.329..511L|last2=Abdala|last3=Richter|last4=Benton|doi=10.1016/S1251-8050(00)80025-7|issue=7}}</ref>
<ref name=NIP07>{{cite journal |last=Nesbitt |first=Sterling J. |year=2007 |title=A critical re-evaluation of the Late Triassic dinosaur taxa of North America |journal=Journal of Systematic Palaeontology |volume=5 |issue=2 |pages=209–243 |doi=10.1017/S1477201907002040 |last2=Irmis |first2=Randall B. |last3=Parker |first3=William G. }}</ref>
<ref name=MJB00>{{cite book|author=Benton, M.J.|year=2004|title=Vertebrate Paleontology|publisher=Blackwell Publishers|pages=xii–452|isbn=0-632-05614-2|nopp=true}}</ref>
<ref name=RC05>{{cite book |last=Cowen |first=Richard |title=History of Life |edition=4th |chapter=Dinosaurs |publisher=Blackwell Publishing |isbn=1-4051-1756-7 |pages=151–175 |year=2004 |oclc=53970577}}</ref>
<ref name=TKMB07>{{cite journal |last=Kubo |first=T. |year=2007 |title=Evolution of hindlimb posture in archosaurs: limb stresses in extinct vertebrates |journal=Palaeontology |volume=50 |issue=6 |pages=1519–1529 |doi=10.1111/j.1475-4983.2007.00723.x |last2=Benton |first2=Michael J.}}</ref>
<ref name=KPA>{{cite journal|author=Kump LR, Pavlov A & Arthur MA|title=Massive release of hydrogen sulfide to the surface ocean and atmosphere during intervals of oceanic anoxia|journal=Geology|year=2005|volume=33|issue=5|pages=397–400|doi=10.1130/G21295.1|bibcode=2005Geo....33..397K}}</ref>
<ref name=TannerLucas>{{cite journal|author=Tanner LH, Lucas SG & Chapman MG|title=Assessing the record and causes of Late Triassic extinctions|journal=Earth-Science Reviews|volume=65|issue=1–2|pages=103–139|year=2004|doi=10.1016/S0012-8252(03)00082-5|url=http://nmnaturalhistory.org/pdf_files/TJB.pdf|format=PDF|accessdate=2007-10-22 |archiveurl = http://web.archive.org/web/20071025225841/http://nmnaturalhistory.org/pdf_files/TJB.pdf |archivedate = October 25, 2007|bibcode=2004ESRv...65..103T}}</ref>
<ref name=Sereno1999>{{cite journal|author=Sereno PC|title=The evolution of dinosaurs|year=1999|journal=Science|volume=284|issue=5423|pages=2137–2147|doi=10.1126/science.284.5423.2137|pmid=10381873}}</ref>
<ref name=SFRM93>{{cite journal |last=Sereno |first=P.C. |authorlink=Paul Sereno |year=1993 |title=Primitive dinosaur skeleton from Argentina and the early evolution of Dinosauria |journal=Nature |volume=361 |pages=64–66|doi=10.1038/361064a0 |last2=Forster |first2=Catherine A. |last3=Rogers |first3=Raymond R. |last4=Monetta |first4=Alfredo M. |issue=6407|bibcode = 1993Natur.361...64S }}</ref>}}
 
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