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Thecodontia

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is Greek for "socket-tooth", referring to the fact that thecodont teeth were set in sockets in the jawbones; an archosaurian characteristic that was inherited by the dinosaurs. While the taxon Thecodontia is obsolete, the term
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remains in use as an anatomical description of teeth in bony sockets; in addition to species formerly in this group (such as crocodiles and dinosaurs), mammals also possess thecodont dentition, which evolved independently.
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attempted to define Thecodontia within a cladistic framework, containing crocodilians and haemothermata (mammals and birds), thus giving the old name to a new concept. All more recent cladistic studies (e.g.,
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Gauthier, J., 1986. Saurischian monophyly and the origin of birds. In: K. Padian, ed. The Origin of Birds and the Evolution of Flight. Memoirs California Academy of Sciences 8. pp. 1–55
258:. As the association of the name with the outdated concept proved to be very strong, it is now considered a historical term only, and its current usage has been abandoned. 238:(of uncertain placement), while retaining the other three suborders. This is the last major textbook that still recognizes the taxon Thecodontia, as it uses a traditional 64:
period. All of them were built somewhat like crocodiles but with shorter skulls, more erect pose and usually somewhat lighter. The group includes the ancestors of
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was simply a catch-all term for any species that didn't fit in one of the other three sub-orders. Pseudosuchia as used in recent literature is a
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1986) have confirmed that Thecodontia as construed by Gardiner is a polyphyletic taxon, the members of which are not united by any
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group (they include among their descendants animals that are not thecodonts), the term is no longer used as a formal name by most
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is still used as an anatomical description of the tooth morphology seen in these species and others.
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Thecodonts are characterized by certain shared primitive features, such as the
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Five types of tooth implanting in non-mammals, including thecodont type
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intended to be paraphyletic to all later archosaurs (see e.g.,
148:(early primitive forms, another paraphyletic assemblage), 39:, one of the aquatic and superficially crocodile-like 204:) that are more closely related to crocodilians than 121:
taxa as natural groups, and because thecodonts are a
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They constitute an evolutionary grade of animals, a "
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Tetrapod classification. 347: 8: 60:period and flourished until the end of the 1735: 1724: 1579: 1544: 1388: 1384: 1112: 1108: 1097: 1084: 887: 641: 518: 507: 494: 440: 431: 370: 354: 340: 332: 245:In his 1982 thesis on amniote phylogeny, 285:, John Wiley & Sons Inc (2nd ed.) 276:Vertebrate Paleontology and Evolution 217:Vertebrate Paleontology and Evolution 144:was divided into four suborders, the 137:Traditionally, the order Thecodontia 7: 220:(1988), replaces Pseudosuchia with 56:that first appeared in the latest 25: 323: (archived November 26, 2010) 2027: 2026: 1710: 1704: 1697: 1069: 1061: 1054: 278:, W. H. Freeman and Co. New York 232:), and the traditional category 228:and non-dinosaur, non-pterosaur 327:Dinosaurs of Rio grande do Sul. 200:, or all archosaurs (including 156:(armoured herbivores), and the 256:shared derived characteristics 1: 2053:Prehistoric reptile taxonomy 300:Stem Archosauria—TaxonSearch 283:Evolution of the Vertebrates 242:derived from that of Romer. 224:, Ornithosuchia (containing 181:Evolution of the Vertebrates 2058:Prehistoric tetrapod orders 2089: 290:Zool. J. Linn. Soc. London 27:Obsolete order of reptiles 2022: 1734: 1723: 1694: 1391: 1387: 1115: 1111: 1096: 1083: 1052: 890: 644: 521: 506: 493: 443: 430: 369: 312:Evolution Wiki: Thecodont 2073:Obsolete vertebrate taxa 113:archosaur). Because the 271:, Blackwell Science Ltd 269:Vertebrate Paleontology 240:Linnaean based taxonomy 171:Vertebrate Paleontology 43: 274:Carroll, R. L. 1988, 166:Alfred Sherwood Romer 33: 298:Sereno, P. C. 2005. 281:Colbert, E H. 1969, 267:Benton, M. J. 1997, 2068:Paraphyletic groups 90:antorbital fenestra 1996:Ichthyosauromorpha 1986:Drepanosauromorpha 115:cladistic paradigm 44: 2040: 2039: 2018: 2017: 2014: 2013: 1719: 1718: 1692: 1691: 1688: 1687: 1684: 1683: 1680: 1679: 1676: 1675: 1532: 1531: 1372: 1371: 1079: 1078: 1050: 1049: 1046: 1045: 1042: 1041: 875: 874: 865:Sharovipterygidae 734:Sharovipterygidae 678:Dinocephalosaurus 489: 488: 485: 484: 481: 480: 162:wastebasket taxon 143: 133:Taxonomic history 107:wastebasket taxon 16:(Redirected from 2080: 2030: 2029: 1974:Possible members 1932: 1922: 1912: 1902: 1892: 1882: 1872: 1862: 1852: 1842: 1832: 1807: 1797: 1787: 1777: 1767: 1757: 1747: 1736: 1725: 1714: 1708: 1702: 1701: 1606: 1595: 1580: 1550: 1545: 1509: 1472: 1457: 1447: 1437: 1427: 1417: 1407: 1397: 1389: 1385: 1302: 1272: 1197: 1182: 1172: 1162: 1152: 1141: 1131: 1121: 1113: 1109: 1103:Archosauriformes 1098: 1090:Archosauriformes 1085: 1074: 1073: 1066: 1065: 1058: 1024:Archosauriformes 994: 968: 942: 927: 917: 909:Cryptovaranoides 906: 896: 888: 815:Langobardisaurus 701:Protanystropheus 662:Trachelosauridae 642: 634: 621:Vritramimosaurus 618: 608: 598: 588: 581:Mecistotrachelos 578: 568: 558: 547: 537: 530:Aenigmastropheus 527: 519: 513:Archosauromorpha 508: 500:Archosauromorpha 495: 463:Archosauromorpha 441: 432: 425: 424: 371: 363:Archosauromorpha 356: 349: 342: 333: 252:Jacques Gauthier 190:stem-based taxon 176:Edwin H. Colbert 138: 117:only recognises 21: 2088: 2087: 2083: 2082: 2081: 2079: 2078: 2077: 2063:Archosauriforms 2043: 2042: 2041: 2036: 2010: 1991:Kuehneosauridae 1969: 1940: 1925:Vjushkovisaurus 1815: 1790:Protecovasaurus 1730: 1715: 1696: 1672: 1643: 1631:Avemetatarsalia 1620:Avemetatarsalia 1614: 1569: 1541: 1528: 1522:Proterochampsia 1511:Proterochampsia 1502: 1465: 1381: 1368: 1313:Bharitalasuchus 1304:Erythrosuchidae 1295: 1265: 1199:Proterosuchidae 1190: 1185:Syntomiprosopus 1105: 1092: 1075: 1068: 1060: 1038: 1018: 987: 961: 935: 884: 871: 843:Sclerostropheus 778:Augustaburiania 762:Tanystropheidae 756: 728: 715:Sclerostropheus 656: 638: 626: 550:Elachistosuchus 515: 502: 477: 457: 426: 376: 375: 365: 360: 321:Wayback Machine 308: 264: 226:Ornithosuchidae 135: 127:paleontologists 86: 28: 23: 22: 15: 12: 11: 5: 2086: 2084: 2076: 2075: 2070: 2065: 2060: 2055: 2045: 2044: 2038: 2037: 2035: 2034: 2023: 2020: 2019: 2016: 2015: 2012: 2011: 2009: 2008: 2006:Thalattosauria 2003: 1998: 1993: 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1255: 1247: 1240: 1233: 1226: 1219: 1215:Chasmatosuchus 1211: 1203: 1201: 1192: 1191: 1189: 1188: 1178: 1168: 1158: 1148: 1137: 1127: 1116: 1106: 1101: 1094: 1093: 1088: 1081: 1080: 1077: 1076: 1053: 1051: 1048: 1047: 1044: 1043: 1040: 1039: 1037: 1036: 1035: 1034: 1028: 1026: 1020: 1019: 1017: 1016: 1009: 1001: 999: 989: 988: 986: 985: 984: 983: 974: 972: 963: 962: 960: 959: 958: 957: 955:Allokotosauria 948: 946: 944:Allokotosauria 937: 936: 934: 933: 923: 920:Tasmaniosaurus 913: 902: 891: 885: 880: 877: 876: 873: 872: 870: 869: 861: 854: 847: 839: 832: 825: 818: 811: 808:Gwyneddosaurus 804: 796: 788: 781: 774: 766: 764: 758: 757: 755: 754: 747: 739: 737: 730: 729: 727: 726: 723:Trachelosaurus 719: 711: 704: 697: 689: 681: 674: 666: 664: 658: 657: 655: 654: 645: 639: 631: 628: 627: 625: 624: 614: 604: 594: 591:Prolacertoides 584: 574: 571:Malutinisuchus 564: 554: 543: 533: 522: 516: 511: 504: 503: 498: 491: 490: 487: 486: 483: 482: 479: 478: 476: 475: 474: 473: 467: 465: 459: 458: 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579: 569: 559: 548: 540:Czatkowiella 538: 528: 415: 406: 397: 292:74: 207–232. 289: 282: 275: 268: 244: 233: 215: 210: 202:crocodilians 186:Pseudosuchia 185: 179: 169: 158:Pseudosuchia 136: 123:paraphyletic 119:monophyletic 104: 98: 93: 87: 77: 74:crocodilians 51:archosaurian 46: 45: 34: 1965:Thecodontia 1935:Wangisuchus 1915:Microcnemus 1895:Fenhosuchus 1885:Exilisuchus 1875:Collilongus 1865:Blomosuchus 1845:Ankistrodon 1800:Uatchitodon 1575:Archosauria 1563:Phytosauria 1552:Phytosauria 1420:Heteropelta 1379:Eucrocopoda 1363:Uralosaurus 1320:Chalishevia 1230:Jaikosuchus 1208:Archosaurus 1124:Antarctanax 899:Boreopricea 829:Macrocnemus 771:Amotosaurus 230:Ornithodira 150:Phytosauria 47:Thecodontia 2047:Categories 1905:Megacnemus 1835:Albisaurus 1739:Tooth taxa 1539:Crurotarsi 1497:Osmolskina 1483:Euparkeria 1460:Vancleavea 1410:Dorosuchus 1334:Fugusuchus 1290:Triopticus 1283:Kranosaura 1223:Gamosaurus 1155:Kalisuchus 1144:Eorasaurus 1134:Cuyosuchus 1033:see below↓ 1013:Prolacerta 1006:Kadimakara 836:Raibliania 822:Luxisaurus 785:Cosesaurus 671:Austronaga 636:Tanysauria 561:Elessaurus 472:see below↓ 451:Sauropsida 436:Sauropsida 393:Sauropsida 262:References 222:Rauisuchia 198:archosaurs 154:Aetosauria 84:Definition 70:pterosaurs 41:phytosaurs 1810:Zanclodon 1664:includes 1635:includes 1400:Asperoris 1342:Garjainia 1259:Vonhuenia 930:Teyujagua 882:Crocopoda 708:Pectodens 379:Kingdom: 194:crocodile 99:thecodont 94:thecodont 78:thecodont 66:dinosaurs 18:Thecodont 2032:Category 402:Diapsida 387:Chordata 385:Phylum: 381:Animalia 62:Triassic 54:reptiles 36:Rutiodon 391:Class: 319:at the 58:Permian 1948:groups 1855:Avipes 744:Ozimek 411:Sauria 196:-line 142:, 1859 72:, and 1637:birds 416:Clade 407:Clade 398:Clade 206:birds 111:basal 1658:see 1629:see 1609:Smok 1561:see 1520:see 979:see 953:see 449:see 174:and 160:, a 140:Owen 178:'s 168:'s 2049:: 418:: 409:: 400:: 208:. 68:, 1931:† 1921:† 1911:† 1901:† 1891:† 1881:† 1871:† 1861:† 1851:† 1841:† 1831:† 1806:† 1796:† 1786:† 1776:† 1766:† 1756:† 1746:† 1605:† 1601:? 1594:† 1549:† 1508:† 1471:† 1456:† 1446:† 1436:† 1426:† 1416:† 1406:† 1396:† 1337:? 1301:† 1271:† 1262:? 1254:? 1218:? 1196:† 1181:† 1171:† 1161:† 1151:† 1147:? 1140:† 1130:† 1120:† 998:? 993:† 967:† 941:† 926:† 916:† 912:? 905:† 895:† 868:? 846:? 803:? 795:? 736:? 718:? 696:? 688:? 653:? 633:† 617:† 607:† 597:† 587:† 577:† 567:† 557:† 553:? 546:† 536:† 526:† 355:e 348:t 341:v 20:)

Index

Thecodont

Rutiodon
phytosaurs
archosaurian
reptiles
Permian
Triassic
dinosaurs
pterosaurs
crocodilians
antorbital fenestra
wastebasket taxon
basal
cladistic paradigm
monophyletic
paraphyletic
paleontologists
Owen
Proterosuchia
Phytosauria
Aetosauria
Pseudosuchia
wastebasket taxon
Alfred Sherwood Romer
Vertebrate Paleontology
Edwin H. Colbert
Evolution of the Vertebrates
stem-based taxon
crocodile

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