736:
702:
3693:
3682:
2100:
2015:
1793:
1720:
1541:
1484:
1192:
1172:
221:
2078:
1907:
1771:
1697:
1358:
1316:
973:
941:
1939:
1388:
1003:
1411:
1040:
780:
Marsh's orders could be divided neatly into two major groups based on this feature. He placed the
Stegosauria and Ornithopoda in the Ornithischia, and the Theropoda and Sauropoda in the Saurischia. Furthermore, Seeley used this major difference in the hip bones, along with many other noted differences between the two groups, to argue that "dinosaurs" were not a natural grouping at all, but rather two distinct orders that had arisen independently from more primitive
721:
3728:
2047:
1519:
1132:
2105:
1798:
1546:
1197:
690:
3676:
1109:
3700:
3687:
1964:
1434:
1063:
2177:
128:
784:. This concept that "dinosaur" was an outdated term for two distinct orders lasted many decades in the scientific and popular literature, and it was not until the 1960s that scientists began to again consider the possibility that saurischians and ornithischians were more closely related to each other than they were to other archosaurs.
779:
Seeley, however, wanted to formulate a classification that would take into account a single primary difference between major dinosaurian groups based on a characteristic that also differentiated them from other reptiles. He found this in the configuration of the hip bones, and found that all four of
661:
also found in modern lizards and other reptiles. He named ornithischians "bird-hipped" dinosaurs because their hip arrangement was superficially similar to that of birds, though he did not propose any specific relationship between ornithischians and birds. However, in the view which has long been
751:
In his paper naming the two groups, Seeley reviewed previous classification schemes put forth by other paleontologists to divide up the traditional order
Dinosauria. He preferred one that had been put forward by
822:. Bakker's classification separated the theropods into their own group and placed the two groups of herbivorous dinosaurs (the sauropodomorphs and ornithischians) together in a separate group he named the
885:
in a clade (Herrerasauria) outside
Dinosauria. Other recent studies support a view closer to the traditional Saurischia hypothesis, with theropods closer to sauropodomorphs than to ornithischians. Novas
873:(2017) recommended using the name Sauropodomorpha to refer to a possible clade that includes traditional sauropodomorphs and herrerasaurids; alternatively, he proposed redefining the long-disused taxon
845:
A 2017 study by
Matthew Grant Baron, David B. Norman and Paul M. Barrett did not find support for a monophyletic Saurischia, according to its traditional definition. Instead, the group was found to be
2651:
Novas, F.E.; Agnolin, F.L.; Ezcurra, M.D.; Müller, R.T.; Martinelli, A.; Langer, M. (2021). "Review of the fossil record of early dinosaurs from South
America, and its phylogenetic implications".
674:: avialans, therizinosaurians, and ornithischian dinosaurs all developed a similar hip anatomy independently of each other, possibly as an adaptation to their herbivorous or
791:
Dinosauria is no longer accepted by most paleontologists, Seeley's basic division of the two dinosaurian groups has stood the test of time, and has been supported by modern
662:
held, this "bird-hipped" arrangement evolved several times independently in dinosaurs, first in the ornithischians, then in the lineage of saurischians including birds (
830:, and the idea that the former had evolved directly from the latter, possibly by way of an enigmatic family that seemed to possess characters of both groups, the
735:
701:
3898:
3821:
3834:
653:, often also with a forward-pointing process, giving a four-pronged structure. The saurischian hip structure led Seeley to name them "
2761:
2497:
Baron, M.G.; Norman, D.B.; Barrett, P.M. (23 March 2017). "A new hypothesis of dinosaur relationships and early dinosaur evolution".
615:
849:. As a solution, Theropoda was removed from the group and placed as the sister group to the Ornithischia in the newly defined clade
877:
to include
Sauropodomorpha and Herrerasauridae as subclades. Cau (2018) also supported Ornithoscelida but placed herrerasaurids,
2548:
2369:
3903:
720:
3893:
2468:
826:("plant dinosaurs"). The Phytodinosauria hypothesis was based partly on the supposed link between ornithischians and
689:
511:
3839:
809:). Any saurischian that diverged before the theropod-sauropodomorph split is therefore outside clade Eusaurischia.
2688:"A paraphyletic 'Silesauridae' as an alternative hypothesis for the initial radiation of ornithischian dinosaurs"
143:
2201:
Langer, M.C.; Ramezani, J.; Da Rosa, Á.A.S. (2018). "U-Pb age constraints on dinosaur rise from south Brazil".
2754:
3692:
3681:
3908:
3731:
220:
3699:
2867:
627:
3610:
2782:
2747:
205:
2387:"A new North American therizinosaurid and the role of herbivory in 'predatory' dinosaur evolution"
853:. As another result, the authors redefined Saurischia as "the most inclusive clade that contains
3865:
3748:
3304:
176:
3675:
3888:
3860:
3394:
818:
753:
159:
3826:
2385:
Zanno, Lindsay E.; Gillette, David D.; Albright, L. Barry; Titus, Alan L. (7 October 2009).
3852:
3795:
3786:
3686:
3132:
2660:
2506:
2210:
671:
8:
2840:
2353:
870:
646:
559:), classified by their hip structure. Saurischia and Ornithischia were originally called
283:
198:
2664:
2617:
Cau, A. (2018). "The assembly of the avian body plan: a 160-million-year long process".
2510:
2214:
3633:
2725:
2712:
2687:
2630:
2596:
2530:
2411:
2386:
2321:
2262:
2237:
215:
3847:
2729:
2717:
2588:
2534:
2522:
2464:
2416:
2365:
2325:
2267:
799:, was named for the least inclusive group containing sauropodomorphs (represented by
183:
154:
2634:
3288:
3048:
2852:
2707:
2699:
2668:
2622:
2600:
2578:
2514:
2406:
2398:
2311:
2257:
2249:
2218:
2181:
813:
603:
476:
3721:
3599:
3542:
3153:
2931:
2909:
2879:
2770:
2672:
2236:
Nesbitt, S. J.; Barrett, P. M.; Werning, S.; Sidor, C. A.; Charig, A. J. (2013).
2009:
1901:
1744:
1738:
1714:
1691:
1479:
1353:
1167:
968:
890:. (2021) support Cau's herrerasaur phylogeny but place this clade in Saurischia.
874:
866:
823:
667:
560:
371:
347:
191:
116:
772:(these names are still used today in much the same way to refer to suborders or
3716:
3572:
3073:
2986:
2952:
2364:(Second ed.). Berkeley: University of California Press. pp. 210–231.
2059:
1752:
1609:
850:
812:
One alternative hypothesis challenging Seeley's classification was proposed by
596:
2099:
2014:
1792:
1719:
1540:
1483:
1191:
1171:
3882:
3771:
3565:
3558:
3514:
3493:
3448:
3311:
3102:
2739:
2222:
1932:
1612:
hypothesis. Taxa traditionally classified as saurischians are highlighted in
1382:
997:
742:
708:
567:
in 1888 though today most paleontologists classify
Saurischia as an unranked
521:
423:
332:
78:
36:
3587:
3506:
3438:
3383:
3318:
3276:
3269:
3261:
3219:
3110:
3057:
3001:
2977:
2721:
2703:
2592:
2526:
2420:
2402:
2357:
2316:
2299:
2271:
2253:
2073:
1938:
1906:
1864:
1859:
1766:
1696:
1652:
1536:
1405:
1387:
1357:
1311:
1285:
1034:
1002:
972:
935:
931:
726:
638:
634:
619:
564:
556:
413:
358:
324:
307:
2300:"I. On the classification of the fossil animals commonly named Dinosauria"
1410:
1039:
3808:
3780:
3551:
3530:
3522:
3479:
3332:
3325:
3297:
3240:
3233:
3194:
3088:
3081:
3031:
3008:
2994:
2963:
2626:
2077:
1957:
1770:
1428:
1315:
1057:
940:
861:
839:
827:
801:
769:
765:
454:
340:
316:
148:
53:
2518:
2046:
1518:
1131:
3458:
3428:
3346:
3339:
3254:
3184:
3174:
3095:
3066:
3015:
2825:
2800:
2040:
1994:
1664:
1513:
1297:
1126:
916:
855:
675:
600:
433:
403:
98:
63:
3813:
2433:
Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (eds.) (2004).
1108:
3622:
3247:
3121:
2809:
2094:
1845:
1787:
1638:
1497:
1271:
1187:
846:
835:
831:
792:
788:
781:
761:
757:
592:
580:
552:
539:
525:
376:
232:
169:
103:
47:
20:
3742:
2583:
2566:
2238:"The oldest dinosaur? A Middle Triassic dinosauriform from Tanzania"
3765:
3468:
3366:
3205:
2794:
1103:
584:
443:
265:
252:
162:
93:
88:
73:
68:
58:
40:
2446:
Weishampel, D. B., Dodson, P., & Osmólska, H. (Eds.). (2007).
2104:
1963:
1797:
1545:
1433:
1196:
1062:
587:) are traditionally classified as saurischians, as are all of the
135:
Montage of six different representatives of saurischian dinosaurs.
663:
658:
650:
611:
108:
83:
3800:
865:", resulting in a clade containing only the Sauropodomorpha and
2788:
2338:
Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). (2004).
654:
642:
242:
2482:
Predatory
Dinosaurs of the World, a Complete Illustrated Guide
894:
Phylogenetic position of saurischians in different topologies
795:
analysis of relationships among dinosaurs. A node-base clade,
773:
623:
607:
568:
546:
532:
482:
127:
657:-hipped" dinosaurs, because they retained the ancestral hip
551:) meaning 'hip joint') is one of the two basic divisions of
3639:
806:
633:
Saurischian dinosaurs are traditionally distinguished from
588:
503:
500:
2437:, Second Edition. University of California Press., 861 pp.
2384:
2235:
2650:
838:
were an unusual type of herbivorous theropod saurischian
746:
pelvis (showing ornithischian structure – left side)
491:
2549:"New study shakes the roots of the dinosaur family tree"
842:, and the Phytodinosauria hypothesis fell out of favor.
2391:
Proceedings of the Royal
Society B: Biological Sciences
712:
pelvis (showing saurischian structure – left side)
2200:
512:
497:
494:
479:
3596:
3490:
3475:
3464:
3454:
3444:
3434:
3424:
3380:
3216:
3201:
3190:
3180:
3170:
3045:
2974:
2959:
2948:
488:
450:
439:
429:
419:
409:
399:
368:
299:
2342:. University of California Press, Berkeley. 833 pp.
756:in 1878, which divided dinosaurs into four orders:
485:
2496:
637:by their three-pronged pelvic structure, with the
3880:
3044:
2619:Bollettino della Società Paleontologica Italiana
2929:
2769:
2755:
2427:
2378:
645:is arranged with the pubis rotated backward,
3379:
2685:
2646:
2644:
2560:
2558:
2492:
2490:
2294:
2292:
2290:
2762:
2748:
2612:
2610:
2453:
2351:
2332:
2304:Proceedings of the Royal Society of London
2229:
126:
2824:
2711:
2641:
2582:
2555:
2487:
2410:
2345:
2315:
2287:
2261:
2653:Journal of South American Earth Sciences
2484:. New York: Simon & Schuster. 464 p.
2474:
695:Saurischian pelvis structure (left side)
2607:
2352:Padian, K. (2004). "Basal Avialae". In
2194:
591:and one of the two primary lineages of
3899:Extant Late Triassic first appearances
3881:
2310:(258–265): 165–171. 31 December 1888.
3747:
3746:
2781:
2743:
2564:
776:within Saurischia and Ornithischia).
641:pointed forward. The ornithischians'
616:Cretaceous–Paleogene extinction event
2567:"Share names for dinosaur divisions"
2463:. New York: William Morrow. p. 203.
520:, meaning "reptile-hipped" from the
2686:Müller, R.T.; Garcia, M.S. (2020).
2616:
834:. However, it was later found that
670:. This would then be an example of
13:
14:
3920:
681:
3727:
3726:
3698:
3691:
3685:
3680:
3674:
2175:
2103:
2098:
2076:
2045:
2013:
1962:
1937:
1905:
1796:
1791:
1769:
1718:
1695:
1544:
1539:
1517:
1482:
1432:
1409:
1386:
1356:
1314:
1195:
1190:
1170:
1130:
1107:
1061:
1038:
1001:
971:
939:
805:) and theropods (represented by
734:
719:
700:
688:
475:
219:
51:
2679:
2541:
144:Herrerasaurus ischigualastensis
2440:
2278:
622:theropod dinosaurs, are a sub-
574:
1:
2187:
139:1st row (early saurischians):
2673:10.1016/j.jsames.2021.103341
2360:; Osmólska, Halszka (eds.).
729:pelvis structure (left side)
626:of saurischian dinosaurs in
583:dinosaurs (certain types of
540:
526:
7:
2450:. Univ of California Press.
2340:The Dinosauria. 2nd edition
2168:
628:phylogenetic classification
10:
3925:
3904:Taxa named by Harry Seeley
2771:Avemetatarsalia / Pan-Aves
899:Müller & Garcia, 2020
787:Although his concept of a
606:, all saurischians except
547:
533:
18:
3894:Carnian first appearances
3755:
3711:
3672:
3621:
3595:
3586:
3541:
3501:
3489:
3420:
3409:
3375:
3364:
3287:
3228:
3215:
3166:
3162:
3151:
3120:
3056:
3040:
3029:
2973:
2944:
2940:
2925:
2906:
2878:
2860:
2851:
2833:
2820:
2777:
2284:Oxford English Dictionary
2091:
2070:
2063:
2035:
2028:
2005:
1998:
1952:
1927:
1920:
1897:
1890:
1879:
1856:
1849:
1784:
1763:
1756:
1710:
1687:
1680:
1668:
1649:
1642:
1608:
1533:
1508:
1501:
1475:
1468:
1424:
1401:
1378:
1371:
1350:
1343:
1332:
1308:
1301:
1282:
1275:
1185:
1164:
1157:
1122:
1099:
1092:
1085:
1053:
1030:
1023:
1016:
993:
986:
965:
958:
927:
920:
296:
291:
216:Scientific classification
214:
134:
125:
30:
2223:10.1016/j.gr.2018.01.005
840:closely related to birds
206:Plateosaurus engelhardti
19:Not to be confused with
635:ornithischian dinosaurs
618:. Birds, as a group of
537:) meaning 'lizard' and
2704:10.1098/rsbl.2020.0417
2459:Bakker, R. T. (1986).
2403:10.1098/rspb.2009.1029
2317:10.1098/rspl.1887.0117
2254:10.1098/rsbl.2012.0949
571:rather than an order.
177:Pelecanus occidentalis
3861:Paleobiology Database
2461:The Dinosaur Heresies
819:The Dinosaur Heresies
754:Othniel Charles Marsh
666:), and lastly in the
614:in the course of the
2627:10.4435/BSPI.2018.01
2565:Holtz, T.R. (2017).
2354:Weishampel, David B.
2182:Dinosaurs portal
672:convergent evolution
599:. At the end of the
2665:2021JSAES.11003341N
2519:10.1038/nature21700
2511:2017Natur.543..501B
2480:Paul, G.S. (1988).
2397:(1672): 3505–3511.
2215:2018GondR..57..133L
895:
199:Apatosaurus louisae
893:
391:uncertain affinity
16:Clade of dinosaurs
3909:Dinosaur taxonomy
3876:
3875:
3848:Open Tree of Life
3749:Taxon identifiers
3740:
3739:
3707:
3706:
3670:
3669:
3666:
3665:
3662:
3661:
3658:
3657:
3654:
3653:
3650:
3649:
3582:
3581:
3405:
3404:
3360:
3359:
3356:
3355:
3147:
3146:
3143:
3142:
3025:
3024:
2921:
2920:
2917:
2916:
2902:
2901:
2898:
2897:
2505:(7646): 501–506.
2371:978-0-520-24209-8
2203:Gondwana Research
2166:
2165:
2161:
2160:
2152:
2151:
2143:
2142:
2134:
2133:
2125:
2124:
2116:
2115:
1984:
1983:
1975:
1974:
1836:
1835:
1827:
1826:
1818:
1817:
1809:
1808:
1731:
1730:
1603:
1602:
1594:
1593:
1585:
1584:
1576:
1575:
1567:
1566:
1558:
1557:
1454:
1453:
1445:
1444:
1262:
1261:
1253:
1252:
1244:
1243:
1235:
1234:
1226:
1225:
1217:
1216:
1208:
1207:
1143:
1142:
1074:
1073:
816:in his 1986 book
668:therizinosaurians
555:(the other being
468:
467:
463:
462:
365:
311:
287:
184:Tyrannosaurus rex
155:Eodromaeus murphi
120:
3916:
3869:
3868:
3856:
3855:
3843:
3842:
3830:
3829:
3817:
3816:
3804:
3803:
3791:
3790:
3789:
3776:
3775:
3774:
3744:
3743:
3730:
3729:
3702:
3696:
3695:
3689:
3684:
3678:
3598:
3593:
3592:
3499:
3498:
3492:
3477:
3466:
3456:
3446:
3436:
3426:
3418:
3417:
3382:
3377:
3376:
3373:
3372:
3289:Sulcimentisauria
3226:
3225:
3218:
3203:
3192:
3182:
3172:
3164:
3163:
3160:
3159:
3054:
3053:
3049:Pterosauromorpha
3047:
3042:
3041:
3038:
3037:
2976:
2961:
2950:
2942:
2941:
2938:
2937:
2927:
2926:
2868:Archosauromorpha
2858:
2857:
2853:Archosauromorpha
2831:
2830:
2822:
2821:
2815:
2814:
2779:
2778:
2764:
2757:
2750:
2741:
2740:
2734:
2733:
2715:
2683:
2677:
2676:
2648:
2639:
2638:
2614:
2605:
2604:
2586:
2562:
2553:
2552:
2551:. 22 March 2017.
2545:
2539:
2538:
2494:
2485:
2478:
2472:
2457:
2451:
2444:
2438:
2431:
2425:
2424:
2414:
2382:
2376:
2375:
2349:
2343:
2336:
2330:
2329:
2319:
2296:
2285:
2282:
2276:
2275:
2265:
2233:
2227:
2226:
2198:
2180:
2179:
2178:
2107:
2102:
2097:
2080:
2066:
2065:
2049:
2044:
2031:
2030:
2017:
2012:
2001:
2000:
1966:
1961:
1941:
1936:
1923:
1922:
1909:
1904:
1893:
1892:
1882:
1881:
1852:
1851:
1842:
1841:
1800:
1795:
1790:
1773:
1759:
1758:
1722:
1717:
1699:
1694:
1683:
1682:
1671:
1670:
1645:
1644:
1635:
1634:
1615:
1549:
1548:
1543:
1522:
1521:
1504:
1503:
1487:
1486:
1471:
1470:
1436:
1413:
1390:
1374:
1373:
1360:
1346:
1345:
1335:
1334:
1318:
1304:
1303:
1278:
1277:
1268:
1267:
1199:
1194:
1174:
1160:
1159:
1134:
1111:
1095:
1094:
1088:
1087:
1065:
1042:
1026:
1025:
1019:
1018:
1005:
989:
988:
975:
961:
960:
944:
943:
923:
922:
913:
912:
896:
892:
814:Robert T. Bakker
738:
723:
704:
692:
550:
549:
543:
536:
535:
529:
516:
510:
509:
506:
505:
502:
499:
496:
493:
490:
487:
484:
481:
452:
441:
431:
421:
411:
401:
385:
384:
370:
357:
306:
301:
282:
224:
223:
130:
114:
113:
50:
34:Temporal range:
28:
27:
3924:
3923:
3919:
3918:
3917:
3915:
3914:
3913:
3879:
3878:
3877:
3872:
3864:
3859:
3851:
3846:
3838:
3833:
3825:
3820:
3812:
3807:
3799:
3794:
3785:
3784:
3779:
3770:
3769:
3764:
3751:
3741:
3736:
3722:Phytodinosauria
3703:
3690:
3646:
3617:
3611:Sauropodomorpha
3600:Sauropodomorpha
3578:
3543:Herrerasauridae
3537:
3485:
3414:
3401:
3369:
3352:
3283:
3211:
3156:
3154:Dinosauromorpha
3139:
3116:
3034:
3021:
2969:
2934:
2932:Avemetatarsalia
2913:
2910:Avemetatarsalia
2894:
2880:Avemetatarsalia
2874:
2847:
2816:
2784:
2783:
2773:
2768:
2738:
2737:
2698:(8): 20200417.
2692:Biology Letters
2684:
2680:
2649:
2642:
2615:
2608:
2584:10.1038/545030d
2563:
2556:
2547:
2546:
2542:
2495:
2488:
2479:
2475:
2458:
2454:
2445:
2441:
2432:
2428:
2383:
2379:
2372:
2350:
2346:
2337:
2333:
2298:
2297:
2288:
2283:
2279:
2248:(1): 20120949.
2234:
2230:
2209:(18): 133–140.
2199:
2195:
2190:
2176:
2174:
2171:
2162:
2153:
2144:
2135:
2126:
2117:
2093:
2038:
2010:Sauropodomorpha
2008:
1985:
1976:
1955:
1930:
1902:Herrerasauridae
1900:
1837:
1828:
1819:
1810:
1786:
1745:Pachypodosauria
1742:
1739:Sauropodomorpha
1732:
1715:Sauropodomorpha
1713:
1692:Herrerasauridae
1690:
1613:
1604:
1595:
1586:
1577:
1568:
1559:
1535:
1510:
1480:Sauropodomorpha
1477:
1455:
1446:
1354:Herrerasauridae
1263:
1254:
1245:
1236:
1227:
1218:
1209:
1168:Sauropodomorpha
1144:
1075:
969:Herrerasauridae
929:
875:Pachypodosauria
867:Herrerasauridae
824:Phytodinosauria
747:
739:
730:
724:
713:
705:
696:
693:
684:
597:sauropodomorphs
595:dinosaurs, the
577:
514:
478:
474:
464:
392:
390:
389:Saurischians of
372:Sauropodomorpha
348:Herrerasauridae
281:
218:
203:
196:
192:sauropodomorphs
188:
181:
174:
166:
152:
141:
136:
121:
117:Middle Triassic
112:
111:
106:
101:
96:
91:
86:
81:
76:
71:
66:
61:
56:
45:
44:
35:
32:
24:
17:
12:
11:
5:
3922:
3912:
3911:
3906:
3901:
3896:
3891:
3874:
3873:
3871:
3870:
3857:
3844:
3831:
3818:
3805:
3792:
3777:
3761:
3759:
3753:
3752:
3738:
3737:
3735:
3734:
3724:
3719:
3717:Ornithoscelida
3712:
3709:
3708:
3705:
3704:
3673:
3671:
3668:
3667:
3664:
3663:
3660:
3659:
3656:
3655:
3652:
3651:
3648:
3647:
3645:
3644:
3643:
3642:
3636:
3627:
3625:
3619:
3618:
3616:
3615:
3614:
3613:
3604:
3602:
3590:
3584:
3583:
3580:
3579:
3577:
3576:
3573:Staurikosaurus
3569:
3562:
3555:
3547:
3545:
3539:
3538:
3536:
3535:
3527:
3519:
3511:
3502:
3496:
3487:
3486:
3484:
3483:
3473:
3462:
3452:
3442:
3432:
3421:
3415:
3410:
3407:
3406:
3403:
3402:
3400:
3399:
3398:
3397:
3388:
3386:
3370:
3365:
3362:
3361:
3358:
3357:
3354:
3353:
3351:
3350:
3343:
3336:
3329:
3322:
3315:
3308:
3301:
3293:
3291:
3285:
3284:
3282:
3281:
3273:
3266:
3258:
3251:
3244:
3237:
3229:
3223:
3213:
3212:
3210:
3209:
3199:
3188:
3178:
3167:
3157:
3152:
3149:
3148:
3145:
3144:
3141:
3140:
3138:
3137:
3136:
3135:
3126:
3124:
3118:
3117:
3115:
3114:
3107:
3099:
3092:
3085:
3078:
3074:Faxinalipterus
3070:
3062:
3060:
3051:
3035:
3030:
3027:
3026:
3023:
3022:
3020:
3019:
3012:
3005:
2998:
2991:
2987:Incertovenator
2982:
2980:
2971:
2970:
2968:
2967:
2957:
2953:Incertovenator
2945:
2935:
2930:
2923:
2922:
2919:
2918:
2915:
2914:
2907:
2904:
2903:
2900:
2899:
2896:
2895:
2893:
2892:
2891:
2890:
2884:
2882:
2876:
2875:
2873:
2872:
2871:
2870:
2861:
2855:
2849:
2848:
2846:
2845:
2844:
2843:
2834:
2828:
2818:
2817:
2813:
2812:
2803:
2797:
2791:
2775:
2774:
2767:
2766:
2759:
2752:
2744:
2736:
2735:
2678:
2640:
2606:
2554:
2540:
2486:
2473:
2452:
2448:The dinosauria
2439:
2435:The Dinosauria
2426:
2377:
2370:
2362:The Dinosauria
2344:
2331:
2286:
2277:
2228:
2192:
2191:
2189:
2186:
2185:
2184:
2170:
2167:
2164:
2163:
2159:
2158:
2155:
2154:
2150:
2149:
2146:
2145:
2141:
2140:
2137:
2136:
2132:
2131:
2128:
2127:
2123:
2122:
2119:
2118:
2114:
2113:
2110:
2109:
2090:
2087:
2086:
2083:
2082:
2069:
2064:
2062:
2060:Ornithoscelida
2056:
2055:
2052:
2051:
2034:
2029:
2027:
2024:
2023:
2020:
2019:
2004:
1999:
1997:
1991:
1990:
1987:
1986:
1982:
1981:
1978:
1977:
1973:
1972:
1969:
1968:
1951:
1948:
1947:
1944:
1943:
1926:
1921:
1919:
1916:
1915:
1912:
1911:
1896:
1891:
1889:
1880:
1878:
1875:
1874:
1871:
1870:
1855:
1850:
1848:
1840:
1838:
1834:
1833:
1830:
1829:
1825:
1824:
1821:
1820:
1816:
1815:
1812:
1811:
1807:
1806:
1803:
1802:
1783:
1780:
1779:
1776:
1775:
1762:
1757:
1755:
1753:Ornithoscelida
1749:
1748:
1734:
1733:
1729:
1728:
1725:
1724:
1709:
1706:
1705:
1702:
1701:
1686:
1681:
1679:
1669:
1667:
1661:
1660:
1657:
1656:
1648:
1643:
1641:
1633:
1630:
1629:
1626:
1618:
1617:
1610:Ornithoscelida
1606:
1605:
1601:
1600:
1597:
1596:
1592:
1591:
1588:
1587:
1583:
1582:
1579:
1578:
1574:
1573:
1570:
1569:
1565:
1564:
1561:
1560:
1556:
1555:
1552:
1551:
1532:
1529:
1528:
1525:
1524:
1507:
1502:
1500:
1494:
1493:
1490:
1489:
1474:
1469:
1467:
1461:
1460:
1457:
1456:
1452:
1451:
1448:
1447:
1443:
1442:
1439:
1438:
1423:
1420:
1419:
1416:
1415:
1400:
1397:
1396:
1393:
1392:
1377:
1372:
1370:
1367:
1366:
1363:
1362:
1349:
1344:
1342:
1333:
1331:
1325:
1324:
1321:
1320:
1307:
1302:
1300:
1294:
1293:
1290:
1289:
1281:
1276:
1274:
1266:
1264:
1260:
1259:
1256:
1255:
1251:
1250:
1247:
1246:
1242:
1241:
1238:
1237:
1233:
1232:
1229:
1228:
1224:
1223:
1220:
1219:
1215:
1214:
1211:
1210:
1206:
1205:
1202:
1201:
1184:
1181:
1180:
1177:
1176:
1163:
1158:
1156:
1150:
1149:
1146:
1145:
1141:
1140:
1137:
1136:
1121:
1118:
1117:
1114:
1113:
1098:
1093:
1091:
1086:
1084:
1081:
1080:
1077:
1076:
1072:
1071:
1068:
1067:
1052:
1049:
1048:
1045:
1044:
1029:
1024:
1022:
1017:
1015:
1012:
1011:
1008:
1007:
992:
987:
985:
982:
981:
978:
977:
964:
959:
957:
951:
950:
947:
946:
926:
921:
919:
911:
908:
907:
900:
851:Ornithoscelida
749:
748:
740:
733:
731:
725:
718:
715:
714:
706:
699:
697:
694:
687:
683:
682:Classification
680:
576:
573:
466:
465:
461:
460:
459:
458:
448:
437:
427:
417:
407:
394:
393:
388:
383:
382:
381:
380:
379:
374:
352:
351:
350:
345:
337:
329:
321:
294:
293:
289:
288:
276:
269:
268:
263:
256:
255:
250:
246:
245:
240:
236:
235:
230:
226:
225:
212:
211:
132:
131:
123:
122:
107:
102:
97:
92:
87:
82:
77:
72:
67:
62:
57:
52:
46:233.23–0
33:
15:
9:
6:
4:
3:
2:
3921:
3910:
3907:
3905:
3902:
3900:
3897:
3895:
3892:
3890:
3887:
3886:
3884:
3867:
3862:
3858:
3854:
3849:
3845:
3841:
3836:
3832:
3828:
3823:
3819:
3815:
3810:
3806:
3802:
3797:
3793:
3788:
3782:
3778:
3773:
3767:
3763:
3762:
3760:
3758:
3754:
3750:
3745:
3733:
3725:
3723:
3720:
3718:
3714:
3713:
3710:
3701:
3697:
3694:
3688:
3683:
3677:
3641:
3637:
3635:
3631:
3630:
3629:
3628:
3626:
3624:
3620:
3612:
3608:
3607:
3606:
3605:
3603:
3601:
3594:
3591:
3589:
3585:
3575:
3574:
3570:
3568:
3567:
3566:Sanjuansaurus
3563:
3561:
3560:
3559:Herrerasaurus
3556:
3554:
3553:
3549:
3548:
3546:
3544:
3540:
3533:
3532:
3528:
3525:
3524:
3520:
3517:
3516:
3515:Daemonosaurus
3512:
3509:
3508:
3504:
3503:
3500:
3497:
3495:
3494:Herrerasauria
3488:
3482:
3481:
3474:
3471:
3470:
3463:
3461:
3460:
3453:
3451:
3450:
3449:Daemonosaurus
3443:
3441:
3440:
3433:
3431:
3430:
3423:
3422:
3419:
3416:
3413:
3408:
3396:
3392:
3391:
3390:
3389:
3387:
3385:
3378:
3374:
3371:
3368:
3363:
3349:
3348:
3344:
3342:
3341:
3337:
3335:
3334:
3330:
3328:
3327:
3323:
3321:
3320:
3316:
3314:
3313:
3312:Eucoelophysis
3309:
3307:
3306:
3302:
3300:
3299:
3295:
3294:
3292:
3290:
3286:
3279:
3278:
3274:
3272:
3271:
3267:
3264:
3263:
3259:
3257:
3256:
3252:
3250:
3249:
3245:
3243:
3242:
3238:
3236:
3235:
3231:
3230:
3227:
3224:
3221:
3214:
3208:
3207:
3200:
3197:
3196:
3189:
3187:
3186:
3179:
3177:
3176:
3169:
3168:
3165:
3161:
3158:
3155:
3150:
3134:
3130:
3129:
3128:
3127:
3125:
3123:
3119:
3113:
3112:
3108:
3105:
3104:
3103:Scleromochlus
3100:
3098:
3097:
3093:
3091:
3090:
3086:
3084:
3083:
3079:
3076:
3075:
3071:
3069:
3068:
3064:
3063:
3061:
3059:
3055:
3052:
3050:
3043:
3039:
3036:
3033:
3028:
3018:
3017:
3013:
3011:
3010:
3006:
3004:
3003:
2999:
2997:
2996:
2992:
2989:
2988:
2984:
2983:
2981:
2979:
2972:
2966:
2965:
2958:
2955:
2954:
2947:
2946:
2943:
2939:
2936:
2933:
2928:
2924:
2912:
2911:
2905:
2888:
2887:
2886:
2885:
2883:
2881:
2877:
2869:
2865:
2864:
2863:
2862:
2859:
2856:
2854:
2850:
2842:
2838:
2837:
2836:
2835:
2832:
2829:
2827:
2823:
2819:
2811:
2807:
2804:
2802:
2798:
2796:
2792:
2790:
2786:
2785:
2780:
2776:
2772:
2765:
2760:
2758:
2753:
2751:
2746:
2745:
2742:
2731:
2727:
2723:
2719:
2714:
2709:
2705:
2701:
2697:
2693:
2689:
2682:
2674:
2670:
2666:
2662:
2658:
2654:
2647:
2645:
2636:
2632:
2628:
2624:
2620:
2613:
2611:
2602:
2598:
2594:
2590:
2585:
2580:
2576:
2572:
2568:
2561:
2559:
2550:
2544:
2536:
2532:
2528:
2524:
2520:
2516:
2512:
2508:
2504:
2500:
2493:
2491:
2483:
2477:
2470:
2469:0-14-010055-5
2466:
2462:
2456:
2449:
2443:
2436:
2430:
2422:
2418:
2413:
2408:
2404:
2400:
2396:
2392:
2388:
2381:
2373:
2367:
2363:
2359:
2358:Dodson, Peter
2355:
2348:
2341:
2335:
2327:
2323:
2318:
2313:
2309:
2305:
2301:
2295:
2293:
2291:
2281:
2273:
2269:
2264:
2259:
2255:
2251:
2247:
2243:
2239:
2232:
2224:
2220:
2216:
2212:
2208:
2204:
2197:
2193:
2183:
2173:
2172:
2157:
2156:
2148:
2147:
2139:
2138:
2130:
2129:
2121:
2120:
2112:
2111:
2108:
2106:
2101:
2096:
2089:
2088:
2085:
2084:
2081:
2079:
2075:
2068:
2067:
2061:
2058:
2057:
2054:
2053:
2050:
2048:
2043:
2042:
2033:
2032:
2026:
2025:
2022:
2021:
2018:
2016:
2011:
2003:
2002:
1996:
1993:
1992:
1989:
1988:
1980:
1979:
1971:
1970:
1967:
1965:
1960:
1959:
1950:
1949:
1946:
1945:
1942:
1940:
1935:
1934:
1933:Daemonosaurus
1925:
1924:
1918:
1917:
1914:
1913:
1910:
1908:
1903:
1895:
1894:
1888:
1887:Herrerasauria
1884:
1883:
1877:
1876:
1873:
1872:
1869:
1867:
1866:
1861:
1854:
1853:
1847:
1844:
1843:
1839:
1832:
1831:
1823:
1822:
1814:
1813:
1805:
1804:
1801:
1799:
1794:
1789:
1782:
1781:
1778:
1777:
1774:
1772:
1768:
1761:
1760:
1754:
1751:
1750:
1746:
1740:
1736:
1735:
1727:
1726:
1723:
1721:
1716:
1708:
1707:
1704:
1703:
1700:
1698:
1693:
1685:
1684:
1677:
1673:
1672:
1666:
1663:
1662:
1659:
1658:
1655:
1654:
1647:
1646:
1640:
1637:
1636:
1632:
1631:
1627:
1624:
1620:
1619:
1611:
1607:
1599:
1598:
1590:
1589:
1581:
1580:
1572:
1571:
1563:
1562:
1554:
1553:
1550:
1547:
1542:
1538:
1531:
1530:
1527:
1526:
1523:
1520:
1516:
1515:
1506:
1505:
1499:
1496:
1495:
1492:
1491:
1488:
1485:
1481:
1473:
1472:
1466:
1463:
1462:
1459:
1458:
1450:
1449:
1441:
1440:
1437:
1435:
1431:
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1422:
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1418:
1417:
1414:
1412:
1408:
1407:
1399:
1398:
1395:
1394:
1391:
1389:
1385:
1384:
1383:Daemonosaurus
1376:
1375:
1369:
1368:
1365:
1364:
1361:
1359:
1355:
1348:
1347:
1341:
1340:Herrerasauria
1337:
1336:
1330:
1327:
1326:
1323:
1322:
1319:
1317:
1313:
1306:
1305:
1299:
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1200:
1198:
1193:
1189:
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1179:
1178:
1175:
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1155:
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1147:
1139:
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1135:
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1105:
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1051:
1050:
1047:
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1043:
1041:
1037:
1036:
1028:
1027:
1021:
1020:
1014:
1013:
1010:
1009:
1006:
1004:
1000:
999:
998:Daemonosaurus
991:
990:
984:
983:
980:
979:
976:
974:
970:
963:
962:
956:
953:
952:
949:
948:
945:
942:
937:
933:
925:
924:
918:
915:
914:
910:
909:
905:
901:
898:
897:
891:
889:
884:
883:Daemonosaurus
880:
876:
872:
868:
864:
863:
858:
857:
852:
848:
843:
841:
837:
833:
829:
825:
821:
820:
815:
810:
808:
804:
803:
798:
794:
790:
785:
783:
777:
775:
771:
767:
763:
759:
755:
745:
744:
743:Edmontosaurus
737:
732:
728:
727:Ornithischian
722:
717:
716:
711:
710:
709:Tyrannosaurus
703:
698:
691:
686:
685:
679:
677:
673:
669:
665:
660:
656:
652:
648:
644:
640:
636:
631:
629:
625:
621:
617:
613:
609:
605:
602:
598:
594:
590:
586:
582:
572:
570:
566:
562:
558:
554:
544:
542:
530:
528:
523:
519:
518:
508:
472:
457:
456:
449:
446:
445:
438:
436:
435:
428:
426:
425:
424:Daemonosaurus
418:
416:
415:
408:
406:
405:
398:
397:
396:
395:
387:
386:
378:
375:
373:
367:
366:
363:
360:
356:
355:Eusaurischia?
353:
349:
346:
343:
342:
338:
335:
334:
333:Daemonosaurus
330:
327:
326:
322:
319:
318:
314:
313:
309:
304:
303:Herrerasauria
298:
297:
295:
290:
285:
280:
277:
274:
271:
270:
267:
264:
261:
258:
257:
254:
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217:
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186:
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179:
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171:
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157:
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140:
133:
129:
124:
118:
110:
105:
100:
95:
90:
85:
80:
75:
70:
65:
60:
55:
49:
42:
38:
37:Late Triassic
29:
26:
22:
3889:Saurischians
3756:
3679:
3588:Eusaurischia
3571:
3564:
3557:
3550:
3529:
3521:
3513:
3507:Chindesaurus
3505:
3478:
3467:
3457:
3447:
3439:Chindesaurus
3437:
3427:
3411:
3395:Ornithischia
3384:Ornithischia
3345:
3338:
3331:
3324:
3319:Ignotosaurus
3317:
3310:
3303:
3296:
3277:Technosaurus
3275:
3270:Soumyasaurus
3268:
3262:Pisanosaurus
3260:
3253:
3246:
3239:
3232:
3220:Silesauridae
3204:
3193:
3183:
3173:
3111:Venetoraptor
3109:
3101:
3094:
3087:
3080:
3072:
3065:
3058:Lagerpetidae
3014:
3007:
3002:Spondylosoma
3000:
2993:
2985:
2978:Aphanosauria
2962:
2951:
2908:
2805:
2695:
2691:
2681:
2656:
2652:
2618:
2574:
2570:
2543:
2502:
2498:
2481:
2476:
2460:
2455:
2447:
2442:
2434:
2429:
2394:
2390:
2380:
2361:
2347:
2339:
2334:
2307:
2303:
2280:
2245:
2241:
2231:
2206:
2202:
2196:
2092:
2074:Ornithischia
2071:
2039:
2036:
2006:
1956:
1953:
1931:
1928:
1898:
1886:
1865:Pisanosaurus
1863:
1860:Silesauridae
1857:
1785:
1767:Ornithischia
1764:
1711:
1688:
1675:
1653:Silesauridae
1650:
1622:
1537:Neotheropoda
1534:
1512:
1509:
1476:
1465:Eusaurischia
1464:
1427:
1425:
1406:Chindesaurus
1404:
1402:
1381:
1379:
1351:
1339:
1328:
1312:Ornithischia
1309:
1286:Silesauridae
1283:
1186:
1165:
1154:Eusaurischia
1153:
1125:
1123:
1102:
1100:
1056:
1054:
1035:Chindesaurus
1033:
1031:
996:
994:
966:
954:
936:Silesauridae
932:Ornithischia
928:
903:
887:
882:
878:
871:Thomas Holtz
860:
854:
847:paraphyletic
844:
828:prosauropods
817:
811:
800:
797:Eusaurischia
796:
789:polyphyletic
786:
778:
750:
741:
707:
632:
620:maniraptoran
578:
565:Harry Seeley
557:Ornithischia
538:
524:
470:
469:
453:
442:
432:
422:
414:Chindesaurus
412:
402:
361:
354:
339:
331:
325:Chindesaurus
323:
315:
302:
278:
272:
259:
204:
197:
189:
182:
175:
167:
153:
142:
138:
137:
31:Saurischians
25:
3809:iNaturalist
3781:Wikispecies
3552:Gnathovorax
3531:Caseosaurus
3333:Lutungutali
3326:Kwanasaurus
3298:Amanasaurus
3241:Asilisaurus
3234:Agnosphitys
3195:Nyasasaurus
3133:Pterosauria
3122:Pterosauria
3089:Kongonaphon
3082:Ixalerpeton
3032:Ornithodira
3009:Teleocrater
2995:Dongusuchus
2964:Mambachiton
2810:Archosauria
2621:(1): 1–25.
802:Cetiosaurus
770:Stegosauria
766:Ornithopoda
593:herbivorous
581:carnivorous
575:Description
317:Caseosaurus
149:herrerasaur
3883:Categories
3787:Saurischia
3757:Saurischia
3715:See also:
3459:Eodromaeus
3429:Alwalkeria
3412:Saurischia
3367:Dinosauria
3347:Silesaurus
3340:Sacisaurus
3255:Lewisuchus
3185:Marasuchus
3175:Lagosuchus
3096:Lagerpeton
3067:Dromomeron
3016:Yarasuchus
2889:see below↓
2841:Sauropsida
2826:Sauropsida
2801:Sauropsida
2659:: 103341.
2577:(30): 30.
2242:Biol. Lett
2188:References
2041:Eodromaeus
1995:Dinosauria
1676:Saurischia
1665:Dinosauria
1628:Cau, 2018
1514:Eodromaeus
1329:Saurischia
1298:Dinosauria
1127:Eodromaeus
955:Saurischia
917:Dinosauria
862:T horridus
859:, but not
856:D carnegii
836:segnosaurs
832:segnosaurs
807:Neornithes
782:archosaurs
676:omnivorous
601:Cretaceous
471:Saurischia
434:Eodromaeus
404:Alwalkeria
292:Subgroups
279:Saurischia
266:Dinosauria
3638:includes
3634:Theropoda
3623:Theropoda
3248:Gamatavus
2787:Kingdom:
2730:221298572
2535:205254710
2326:129792059
2095:Theropoda
1846:Dracohors
1788:Theropoda
1639:Dracohors
1498:Theropoda
1272:Dracohors
1188:Theropoda
793:cladistic
762:Theropoda
758:Sauropoda
649:with the
585:theropods
553:dinosaurs
377:Theropoda
239:Kingdom:
233:Eukaryota
190:3rd row (
170:theropods
168:2nd row (
115:Possible
21:Sauropoda
3766:Wikidata
3732:Category
3469:Saltopus
3305:Diodorus
3206:Saltopus
2795:Chordata
2793:Phylum:
2789:Animalia
2722:32842895
2635:44078918
2593:28470208
2527:28332513
2421:19605396
2272:23221875
2169:See also
1104:Saltopus
934:(incl. "
647:parallel
444:Saltopus
253:Chordata
249:Phylum:
243:Animalia
229:Domain:
163:theropod
3801:4531095
3772:Q186334
2799:Class:
2713:7480155
2661:Bibcode
2601:4395996
2507:Bibcode
2412:2817200
2263:3565515
2211:Bibcode
1862:(incl.
1678:
1625:, 2017
906:, 2021
678:diets.
664:Avialae
659:anatomy
651:ischium
612:extinct
610:became
541:ischion
41:Present
3840:436489
3814:567766
2728:
2720:
2710:
2633:
2599:
2591:
2571:Nature
2533:
2525:
2499:Nature
2467:
2419:
2409:
2368:
2324:
2270:
2260:
1623:et al.
1621:Baron
904:et al.
902:Novas
774:clades
768:, and
655:lizard
643:pelvis
604:Period
561:orders
548:ἴσχιον
534:σαῦρος
527:sauros
517:-kee-ə
364:, 1999
362:et al.
359:Padian
310:, 1985
308:Galton
286:, 1888
284:Seeley
119:record
3866:91969
3853:90223
3827:10565
3822:IRMNG
3640:birds
2806:Clade
2726:S2CID
2631:S2CID
2597:S2CID
2531:S2CID
2322:S2CID
1614:green
888:et al
639:pubis
624:clade
608:birds
589:birds
569:clade
522:Greek
273:Clade
260:Clade
160:basal
3835:NCBI
3632:see
3609:see
3523:Tawa
3480:Tawa
3393:see
3131:see
2866:see
2839:see
2718:PMID
2589:PMID
2523:PMID
2465:ISBN
2417:PMID
2366:ISBN
2268:PMID
1958:Tawa
1429:Tawa
1058:Tawa
881:and
879:Tawa
579:All
513:saw-
455:Tawa
341:Tawa
54:PreꞒ
3796:EoL
2708:PMC
2700:doi
2669:doi
2623:doi
2579:doi
2575:545
2515:doi
2503:543
2407:PMC
2399:doi
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563:by
515:RIS
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