1464:
1453:
1525:
137:
1499:
119:
1447:
1471:
1458:
361:
The ilium is slender, and its blade has an extremely thin central portion (only 1 millimetre (0.039 in) thick), hence the specific name 'fragilis'. It has the saddle-shaped lateral profile of most silesaurids, and is longer than it is deep. The
396:. The postacetabular process is long and has a brevis fossa present on the ventral side. It has a thick rectangular cross-section and a rugose area at the end. The pubic peduncle is long and stout, with a prominent dorsal margin.
1619:
1573:
532:
500:, Memoir 12: Basal sauropodomorphs and the vertebrate fossil record of the Ischigualasto Formation (Late Triassic: Carnian-Norian) of Argentina: 10–30
1639:
416:
but as only one of the three characteristic features for silesaurids is preserved this is not certain (the other features are on the femur and
384:. The preacteabular process is flattened anteroposteriorly and is angled at 90° to the iliac blade, pointing anterolaterally - these are the
1644:
496:
305:
1634:
1463:
1629:
525:
1515:
1452:
136:
1624:
1502:
638:
378:. A ridge rises from the dorsal edge of this crest and joins the preacetabular process, as in the close relative
349:. This ilium is approximately 70 millimetres (2.8 in) long, but it is difficult to say accurately how large
1470:
1381:
518:
1614:
345:' 'lizard', is quite apt as there is only one specimen known and this specimen is only known from the right
301:
1541:
1075:
1446:
1586:
1165:
1649:
1457:
903:
237:
1529:
611:
366:
has a back wall created by a ventral flange and this closes a socket as it is in contact with the
1404:
131:
1591:
1578:
374:. The supraacetabular crest is laterally oriented and forms part of the articulation for the
1059:
819:
623:
1492:
1370:
1313:
924:
702:
680:
650:
541:
439:, like other silesaurids, it would probably have flourished here, competing for food with
1487:
1343:
844:
757:
723:
428:
1608:
1336:
1329:
1285:
1264:
1219:
1082:
873:
491:
421:
411:
336:
318:
293:
289:
69:
490:; Fernández, Eliana; Santi Malnis, Paula; Correa, Gustavo A.; Abelin, Diego (2013),
1358:
1277:
1209:
1154:
1047:
1040:
1032:
990:
881:
828:
772:
748:
385:
371:
346:
245:
213:
197:
118:
389:
1564:
486:
Martínez, Ricardo N.; Apaldetti, Cecilia; Alcober, Oscar A.; Colombi, Carina E.;
1322:
1301:
1293:
1250:
1103:
1096:
1068:
1011:
1004:
965:
859:
852:
802:
779:
765:
734:
487:
440:
44:
1229:
1199:
1182:
1117:
1110:
1025:
955:
945:
866:
837:
786:
596:
571:
405:
380:
363:
286:
89:
54:
510:
1393:
1018:
892:
580:
436:
309:
148:
94:
38:
1558:
1239:
1137:
976:
565:
444:
313:
181:
168:
84:
79:
64:
59:
49:
367:
297:
279:
99:
74:
30:
559:
158:
1535:
427:
It is thought that the
Ischigualasto Formation at this time was a
417:
375:
332:
282:
1410:
1539:
552:
514:
340:
492:"Vertebrate succession in the Ischigualasto Formation"
1513:
1367:
1261:
1246:
1235:
1225:
1215:
1205:
1195:
1151:
987:
972:
961:
951:
941:
816:
745:
730:
719:
252:
126:
The holotype ilium, seen in dorsal and lateral view
1548:
1392:
1366:
1357:
1312:
1260:
1180:
1150:
1135:
1058:
986:
922:
891:
827:
815:
800:
744:
700:
649:
622:
595:
468:
466:
464:
462:
460:
392:growth, but it is less extensive than that of
388:of this species. The end of the process has a
526:
8:
331:The name, meaning 'unknown lizard' from the
1536:
1363:
1269:
1188:
1147:
1143:
996:
934:
930:
824:
812:
808:
712:
708:
697:
628:
601:
592:
549:
533:
519:
511:
117:
20:
402:is thought to be most closely related to
1620:Late Triassic reptiles of South America
1520:
456:
431:habitat with abundant vegetation. As
312:. It was therefore contemporary with
7:
447:and possibly some early dinosaurs.
497:Journal of Vertebrate Paleontology
14:
300:) Cancha de Bochas Member of the
1523:
1498:
1497:
1469:
1462:
1456:
1451:
1445:
135:
306:Ischigualasto-Villa Unión Basin
1:
1640:Fossil taxa described in 2013
323:and lived in the same place.
335:'ignotus' 'unknown' and the
1666:
542:Avemetatarsalia / Pan-Aves
341:
1645:Taxa named by Paul Sereno
1482:
1443:
1272:
1191:
1146:
999:
937:
933:
811:
715:
711:
696:
677:
631:
604:
591:
548:
251:
244:
132:Scientific classification
130:
125:
116:
23:
16:Extinct genus of reptiles
1635:Ischigualasto Formation
302:Ischigualasto Formation
1587:Paleobiology Database
472:Martínez et al., 2013
257:Ignotosaurus fragilis
1630:Fossils of Argentina
386:diagnostic features
1625:Triassic Argentina
1602:
1601:
1542:Taxon identifiers
1511:
1510:
1478:
1477:
1441:
1440:
1437:
1436:
1433:
1432:
1429:
1428:
1425:
1424:
1421:
1420:
1353:
1352:
1176:
1175:
1131:
1130:
1127:
1126:
918:
917:
914:
913:
796:
795:
692:
691:
688:
687:
673:
672:
669:
668:
271:
270:
240:
37:231.7–231.1
1657:
1595:
1594:
1582:
1581:
1569:
1568:
1567:
1537:
1528:
1527:
1526:
1519:
1501:
1500:
1473:
1467:
1466:
1460:
1455:
1449:
1369:
1364:
1270:
1263:
1248:
1237:
1227:
1217:
1207:
1197:
1189:
1153:
1148:
1144:
1060:Sulcimentisauria
997:
989:
974:
963:
953:
943:
935:
931:
825:
820:Pterosauromorpha
818:
813:
809:
747:
732:
721:
713:
709:
698:
639:Archosauromorpha
629:
624:Archosauromorpha
602:
593:
586:
585:
550:
535:
528:
521:
512:
507:
506:
505:
473:
470:
420:, which are not
344:
343:
308:in northwestern
254:
232:
225:
212:
201:
196:
140:
139:
121:
111:
41:
29:Temporal range:
21:
1665:
1664:
1660:
1659:
1658:
1656:
1655:
1654:
1605:
1604:
1603:
1598:
1590:
1585:
1577:
1572:
1563:
1562:
1557:
1544:
1534:
1524:
1522:
1514:
1512:
1507:
1493:Phytodinosauria
1474:
1461:
1417:
1388:
1382:Sauropodomorpha
1371:Sauropodomorpha
1349:
1314:Herrerasauridae
1308:
1256:
1185:
1172:
1140:
1123:
1054:
982:
927:
925:Dinosauromorpha
910:
887:
805:
792:
740:
705:
703:Avemetatarsalia
684:
681:Avemetatarsalia
665:
651:Avemetatarsalia
645:
618:
587:
555:
554:
544:
539:
503:
501:
488:Sereno, Paul C.
485:
482:
477:
476:
471:
458:
453:
435:was probably a
359:
329:
314:early dinosaurs
292:known from the
267:
260:
231:
223:
210:
199:
194:
134:
112:
110:
109:
108:
107:
102:
97:
92:
87:
82:
77:
72:
67:
62:
57:
52:
47:
36:
35:
33:
27:
17:
12:
11:
5:
1663:
1661:
1653:
1652:
1647:
1642:
1637:
1632:
1627:
1622:
1617:
1615:Carnian genera
1607:
1606:
1600:
1599:
1597:
1596:
1583:
1570:
1554:
1552:
1546:
1545:
1540:
1533:
1532:
1509:
1508:
1506:
1505:
1495:
1490:
1488:Ornithoscelida
1483:
1480:
1479:
1476:
1475:
1444:
1442:
1439:
1438:
1435:
1434:
1431:
1430:
1427:
1426:
1423:
1422:
1419:
1418:
1416:
1415:
1414:
1413:
1407:
1398:
1396:
1390:
1389:
1387:
1386:
1385:
1384:
1375:
1373:
1361:
1355:
1354:
1351:
1350:
1348:
1347:
1344:Staurikosaurus
1340:
1333:
1326:
1318:
1316:
1310:
1309:
1307:
1306:
1298:
1290:
1282:
1273:
1267:
1258:
1257:
1255:
1254:
1244:
1233:
1223:
1213:
1203:
1192:
1186:
1181:
1178:
1177:
1174:
1173:
1171:
1170:
1169:
1168:
1159:
1157:
1141:
1136:
1133:
1132:
1129:
1128:
1125:
1124:
1122:
1121:
1114:
1107:
1100:
1093:
1086:
1079:
1072:
1064:
1062:
1056:
1055:
1053:
1052:
1044:
1037:
1029:
1022:
1015:
1008:
1000:
994:
984:
983:
981:
980:
970:
959:
949:
938:
928:
923:
920:
919:
916:
915:
912:
911:
909:
908:
907:
906:
897:
895:
889:
888:
886:
885:
878:
870:
863:
856:
849:
845:Faxinalipterus
841:
833:
831:
822:
806:
801:
798:
797:
794:
793:
791:
790:
783:
776:
769:
762:
758:Incertovenator
753:
751:
742:
741:
739:
738:
728:
724:Incertovenator
716:
706:
701:
694:
693:
690:
689:
686:
685:
678:
675:
674:
671:
670:
667:
666:
664:
663:
662:
661:
655:
653:
647:
646:
644:
643:
642:
641:
632:
626:
620:
619:
617:
616:
615:
614:
605:
599:
589:
588:
584:
583:
574:
568:
562:
553:
546:
545:
540:
538:
537:
530:
523:
515:
509:
508:
481:
478:
475:
474:
455:
454:
452:
449:
358:
355:
328:
325:
269:
268:
261:
249:
248:
242:
241:
221:
217:
216:
208:
204:
203:
192:
185:
184:
179:
172:
171:
166:
162:
161:
156:
152:
151:
146:
142:
141:
128:
127:
123:
122:
114:
113:
105:
104:
103:
98:
93:
88:
83:
78:
73:
68:
63:
58:
53:
48:
43:
42:
28:
15:
13:
10:
9:
6:
4:
3:
2:
1662:
1651:
1648:
1646:
1643:
1641:
1638:
1636:
1633:
1631:
1628:
1626:
1623:
1621:
1618:
1616:
1613:
1612:
1610:
1593:
1588:
1584:
1580:
1575:
1571:
1566:
1560:
1556:
1555:
1553:
1551:
1547:
1543:
1538:
1531:
1521:
1517:
1504:
1496:
1494:
1491:
1489:
1485:
1484:
1481:
1472:
1468:
1465:
1459:
1454:
1448:
1412:
1408:
1406:
1402:
1401:
1400:
1399:
1397:
1395:
1391:
1383:
1379:
1378:
1377:
1376:
1374:
1372:
1365:
1362:
1360:
1356:
1346:
1345:
1341:
1339:
1338:
1337:Sanjuansaurus
1334:
1332:
1331:
1330:Herrerasaurus
1327:
1325:
1324:
1320:
1319:
1317:
1315:
1311:
1304:
1303:
1299:
1296:
1295:
1291:
1288:
1287:
1286:Daemonosaurus
1283:
1280:
1279:
1275:
1274:
1271:
1268:
1266:
1265:Herrerasauria
1259:
1253:
1252:
1245:
1242:
1241:
1234:
1232:
1231:
1224:
1222:
1221:
1220:Daemonosaurus
1214:
1212:
1211:
1204:
1202:
1201:
1194:
1193:
1190:
1187:
1184:
1179:
1167:
1163:
1162:
1161:
1160:
1158:
1156:
1149:
1145:
1142:
1139:
1134:
1120:
1119:
1115:
1113:
1112:
1108:
1106:
1105:
1101:
1099:
1098:
1094:
1092:
1091:
1087:
1085:
1084:
1083:Eucoelophysis
1080:
1078:
1077:
1073:
1071:
1070:
1066:
1065:
1063:
1061:
1057:
1050:
1049:
1045:
1043:
1042:
1038:
1035:
1034:
1030:
1028:
1027:
1023:
1021:
1020:
1016:
1014:
1013:
1009:
1007:
1006:
1002:
1001:
998:
995:
992:
985:
979:
978:
971:
968:
967:
960:
958:
957:
950:
948:
947:
940:
939:
936:
932:
929:
926:
921:
905:
901:
900:
899:
898:
896:
894:
890:
884:
883:
879:
876:
875:
874:Scleromochlus
871:
869:
868:
864:
862:
861:
857:
855:
854:
850:
847:
846:
842:
840:
839:
835:
834:
832:
830:
826:
823:
821:
814:
810:
807:
804:
799:
789:
788:
784:
782:
781:
777:
775:
774:
770:
768:
767:
763:
760:
759:
755:
754:
752:
750:
743:
737:
736:
729:
726:
725:
718:
717:
714:
710:
707:
704:
699:
695:
683:
682:
676:
659:
658:
657:
656:
654:
652:
648:
640:
636:
635:
634:
633:
630:
627:
625:
621:
613:
609:
608:
607:
606:
603:
600:
598:
594:
590:
582:
578:
575:
573:
569:
567:
563:
561:
557:
556:
551:
547:
543:
536:
531:
529:
524:
522:
517:
516:
513:
499:
498:
493:
489:
484:
483:
479:
469:
467:
465:
463:
461:
457:
450:
448:
446:
442:
438:
434:
430:
425:
423:
419:
415:
413:
412:Eucoelophysis
408:
407:
401:
397:
395:
391:
387:
383:
382:
377:
373:
369:
365:
356:
354:
352:
348:
338:
334:
326:
324:
322:
320:
319:Herrerasaurus
315:
311:
307:
303:
299:
295:
294:Late Triassic
291:
290:dinosauriform
288:
284:
281:
277:
276:
265:
259:
258:
250:
247:
243:
239:
236:
230:
229:
222:
219:
218:
215:
209:
206:
205:
202:
193:
190:
187:
186:
183:
180:
177:
174:
173:
170:
167:
164:
163:
160:
157:
154:
153:
150:
147:
144:
143:
138:
133:
129:
124:
120:
115:
101:
96:
91:
86:
81:
76:
71:
66:
61:
56:
51:
46:
40:
32:
26:
22:
19:
1550:Ignotosaurus
1549:
1530:Paleontology
1450:
1359:Eusaurischia
1342:
1335:
1328:
1321:
1300:
1292:
1284:
1278:Chindesaurus
1276:
1249:
1238:
1228:
1218:
1210:Chindesaurus
1208:
1198:
1166:Ornithischia
1155:Ornithischia
1116:
1109:
1102:
1095:
1090:Ignotosaurus
1089:
1088:
1081:
1074:
1067:
1048:Technosaurus
1046:
1041:Soumyasaurus
1039:
1033:Pisanosaurus
1031:
1024:
1017:
1010:
1003:
991:Silesauridae
975:
964:
954:
944:
882:Venetoraptor
880:
872:
865:
858:
851:
843:
836:
829:Lagerpetidae
785:
778:
773:Spondylosoma
771:
764:
756:
749:Aphanosauria
733:
722:
679:
576:
502:, retrieved
495:
480:Bibliography
441:rhynchosaurs
433:Ignotosaurus
432:
426:
410:
404:Silesaurus,
403:
400:Ignotosaurus
399:
398:
393:
379:
360:
351:Ignotosaurus
350:
330:
317:
275:Ignotosaurus
274:
273:
272:
263:
256:
255:
246:Type species
234:
228:Ignotosaurus
227:
226:
214:Silesauridae
198:Ornithischia
188:
175:
25:Ignotosaurus
24:
18:
1650:Silesaurids
1323:Gnathovorax
1302:Caseosaurus
1104:Lutungutali
1097:Kwanasaurus
1069:Amanasaurus
1012:Asilisaurus
1005:Agnosphitys
966:Nyasasaurus
904:Pterosauria
893:Pterosauria
860:Kongonaphon
853:Ixalerpeton
803:Ornithodira
780:Teleocrater
766:Dongusuchus
735:Mambachiton
581:Archosauria
429:river basin
357:Description
1609:Categories
1486:See also:
1230:Eodromaeus
1200:Alwalkeria
1183:Saurischia
1138:Dinosauria
1118:Silesaurus
1111:Sacisaurus
1026:Lewisuchus
956:Marasuchus
946:Lagosuchus
867:Lagerpeton
838:Dromomeron
787:Yarasuchus
660:see below↓
612:Sauropsida
597:Sauropsida
572:Sauropsida
504:2019-03-29
451:References
406:Sacisaurus
394:Silesaurus
381:Silesaurus
364:acetabulum
287:silesaurid
182:Dinosauria
1565:Q16753928
1409:includes
1405:Theropoda
1394:Theropoda
1019:Gamatavus
558:Kingdom:
445:cynodonts
437:herbivore
422:preserved
327:Etymology
310:Argentina
262:Martínez
233:Martínez
200: (?)
155:Kingdom:
149:Eukaryota
1559:Wikidata
1503:Category
1240:Saltopus
1076:Diodorus
977:Saltopus
566:Chordata
564:Phylum:
560:Animalia
316:such as
207:Family:
169:Chordata
165:Phylum:
159:Animalia
145:Domain:
1579:1481788
570:Class:
368:ischium
304:in the
298:Carnian
280:extinct
220:Genus:
106:↓
31:Carnian
1592:281447
1516:Portal
390:rugose
342:σαυρος
278:is an
264:et al.
235:et al.
1574:IRMNG
1411:birds
577:Clade
418:tibia
376:femur
372:pubis
353:was.
347:ilium
337:Greek
333:Latin
283:genus
189:Clade
176:Clade
1403:see
1380:see
1294:Tawa
1251:Tawa
1164:see
902:see
637:see
610:see
409:and
370:and
266:2013
238:2013
45:PreꞒ
424:).
285:of
1611::
1589::
1576::
1561::
579::
494:,
459:^
443:,
191::
178::
95:Pg
39:Ma
1518::
1368:†
1305:?
1297:?
1289:?
1281:?
1262:†
1247:†
1243:?
1236:†
1226:†
1216:†
1206:†
1196:†
1152:†
1051:?
1036:?
993:?
988:†
973:†
969:?
962:†
952:†
942:†
877:?
848:?
817:†
761:?
746:†
731:†
727:?
720:†
534:e
527:t
520:v
414:,
339:'
321:,
296:(
253:†
224:†
211:†
195:†
100:N
90:K
85:J
80:T
75:P
70:C
65:D
60:S
55:O
50:Ꞓ
34:~
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