Knowledge (XXG)

Hurdia

Source πŸ“

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convexly curved. Podomeres 2 to 6 bore long downward pointing spines (ventral spines) with forward-curving tips. These ventral spines themselves bore up to 9 equally spaced forward-facing spines dubbed auxiliary spines, with podomeres 7 and 8 bearing shorter, smooth forward curving spines. The frontal appenages were used to bring food to its ring-shaped mouth (oral cone), in which four large plates are present, with inner rows of spines inside the main cone. Like other hurdiids,
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reached up to just 8.1 cm (3.2 in) long. Its head bore a pair of frontal appendages. These frontal appendages had 9 or more rarely 10 or 11 segments/podomeres, which were approximately rectangular and decreased in size towards the end of the appendage. The upper surface of the appendage was
430: 615:. Walcott's original specimens consisted only of H-elements of the frontal carapace, which he interpreted as being the carapace of an unidentified type of crustacean. P-elements of the carapace were described as a separate genus, 1001: 1231:
D. Collins, in North American Paleontological Convention, Chicago, Abstracts with Programs, S. Lidgard, P. R. Crane, Eds. (The Paleontological Society, Special Publication 6, Chicago, IL, 1992), p. 66,
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was also a specimen of the species. He presented his ideas in informal articles, and it was not until 2009, after three years of painstaking research, that the complete organism was reconstructed.
395:: a central component known as the H-element and two lateral components known as P-elements. Originally, it is estimated that body flaps ran along the sides of the organisms, from which large 1747: 1840: 418: 1181:
Collins, Desmond (1996). "The "Evolution" of Anomalocaris and Its Classification in the Arthropod Class Dinocarida (nov.) and Order Radiodonta (nov.)".
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is either suggested to have used its frontal appendages to sift small prey from sediment, or to have used them as a trap to capture larger
1896: 1080:"A new middle Cambrian radiodont from North China: Implications for morphological disparity and spatial distribution of hurdiids" 675: 463: 451: 1881: 1268: 1142:
Daley, Allison C.; Budd, Graham E.; Caron, Jean-Bernard (2013). "Morphology and systematics of the anomalocaridid arthropod
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Caron, Jean-Bernard; Jackson, Donald A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale".
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Pates, Stephen; Daley, Allison C.; Edgecombe, Gregory D.; Cong, Peiyun; Lieberman, Bruce S. (2021). Zhang, Xi‐Guang (ed.).
771:"Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah" 1886: 822:
Daley, A. C.; Budd, G. E.; Caron, J. B.; Edgecombe, G. D.; Collins, D. (2009). "The Burgess Shale anomalocaridid
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Walcott, Charles D. (1912-03-13). "Middle Cambrian Branchiopoda, Malacostraca, Trilobita, and Merostomata".
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were based on different parts of the same animal, and recognized that a specimen previously assigned to
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Interpretations of placements (A based on articulated specimens, B based on speculation from
1712: 1590: 1549: 1507: 1309: 1198: 1155: 1091: 1052: 1013: 969: 953: 898: 843: 783: 734: 716: 878: 1496: 528: 30: 942:"Three-dimensional modelling, disparity and ecology of the first Cambrian apex predators" 1305: 1194: 1040: 894: 879:"Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps" 839: 712: 1482: 974: 941: 739: 696: 1875: 1693: 1565: 1558: 1466: 1428: 1218: 926: 863: 663: 536: 516: 68: 1329: 1167: 803: 1805: 1721: 1700: 1679: 1644: 1637: 1606: 1599: 1516: 1474: 631: 611: 532: 524: 501: 438: 401: 249: 194: 1159: 1095: 787: 515:
had cosmopolitan distribution; two described species has been recovered from the
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Period. Fossils have been found in North America, China and the Czech Republic.
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De Vivo, Giacinto; Lautenschlager, Stephan; Vinther, Jakob (2021-07-28).
601:. It is possible that Walcott had described a specimen the year prior as 392: 391:
bore a large frontal carapace protruding from its head composed of three
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Daley, Allison C.; Budd, Graham E.; Caron, Jean-Bernard (October 2013).
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D. Collins (1999). "Dinocarids: the first monster predators on earth".
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reached between 18.3–30.5 cm (7.2–12.0 in) in length, while
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had both ventral and dorsal flaps, and gills were on trunk segments.
171: 1761: 1002:"Hurdiid radiodontans from the middle Cambrian (Series 3) of Utah" 396: 353: 1819: 1765: 1377: 1000:
Pates, Stephen; Daley, Allison C.; Lieberman, Bruce S. (2018).
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Van Roy, Peter; Daley, Allison C.; Briggs, Derek E. G. (2015).
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Fossil fragments reveal 500-million-year-old monster predator
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was one of the largest organisms in the Cambrian oceans,
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from the Middle Cambrian of British Columbia and Utah".
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Proceedings of the Royal Society B: Biological Sciences
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and its significance for early euarthropod evolution".
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Sun, Zhixin; Zeng, Han; Zhao, Fangchen (2020-11-15).
327: 315: 290: 279: 256: 1774: 1711: 1616: 1589: 1548: 1506: 1450: 695:Lerosey-Aubril, Rudy; Pates, Stephen (2018-09-14). 769: 1246:. Vol. 32. Royal Ontario Museum. p. 25. 1084:Palaeogeography, Palaeoclimatology, Palaeoecology 666:, where they comprise 0.13% of the community. 643:in the group. He subsequently recognized that 559:of the Czech Republic (which is identified as 442:) of the frontal appendages and mouthparts of 1389: 1115: 1113: 527:in Utah, USA. Unnamed species are known from 8: 1269:New animal discovered by Canadian researcher 1137: 1135: 363:that lived 505 million years ago during the 817: 815: 813: 635:and its close relatives, and included both 1762: 1622: 1458: 1447: 1396: 1382: 1374: 629:erected the taxon Radiodonta to encompass 519:in British Columbia, Canada. In addition, 130: 109: 20: 973: 738: 720: 563:in some papers), and unnamed fossil from 687: 424:Movement range of the frontal appendage 414: 1122:Smithsonian Miscellaneous Collections 589:, with two species, the type species 7: 1281:Scientists identify T-Rex of the sea 995: 993: 763: 761: 399:were suspended. However, anatomy of 1148:Journal of Systematic Palaeontology 776:Journal of Systematic Palaeontology 1358:. Virtual Museum of Canada. 2011. 469:Size comparison of the two species 14: 1746: 474: 462: 450: 429: 417: 148: 1362:from the original on 2020-11-12 676:Paleobiota of the Burgess Shale 1: 1902:Fossil taxa described in 1912 622:In 1996, then-curator of the 1356:Burgess Shale Fossil Gallery 1160:10.1080/14772019.2012.732723 1096:10.1016/j.palaeo.2020.109947 788:10.1080/14772019.2012.732723 541:Huangshandongia yichangensis 320:Huangshandongia yichangensis 662:are known from the Greater 597:. The genus name refers to 570:could represent species of 457:Morphology of the oral cone 16:Extinct genus of radiodonts 1918: 1897:Cambrian genus extinctions 1314:10.2110/palo.2003.P05-070R 722:10.1038/s41467-018-06229-7 504:(seafloor dwelling) prey. 298:Chlupach and Kordule, 2002 1744: 1625: 1461: 1446: 1411: 1203:10.1017/S0022336000023362 335:Shicheng and Zhilin, 1990 323:Shicheng and Zhilin, 1990 312: 305: 276: 271: 255: 248: 145:Scientific classification 143: 138: 129: 117: 108: 23: 658:Sixty-nine specimens of 593:and a referred species, 1183:Journal of Paleontology 1045:Papers in Palaeontology 1006:Journal of Paleontology 848:10.1126/science.1169514 523:is also known from the 139:Disarticulated fossils 958:10.1098/rspb.2021.1176 1882:Burgess Shale fossils 1854:Paleobiology Database 701:Nature Communications 585:was named in 1912 by 551:in Hubei, China, and 549:Shuijingtuo Formation 624:Royal Ontario Museum 553:Proboscicaris hospes 535:in Nevada, USA, and 1887:Cambrian arthropods 1729:Pseudoangustidontus 1306:2006Palai..21..451C 1195:1996JPal...70..280C 1018:10.1017/jpa.2017.11 903:10.1038/nature14256 895:2015Natur.522...77V 840:2009Sci...323.1597D 834:(5921): 1597–1600. 713:2018NatCo...9.3774L 952:(1955): 20211176. 627:Desmond H. Collins 568:Fezouata Formation 118:Reconstruction of 1869: 1868: 1768:Taxon identifiers 1759: 1758: 1755: 1754: 1742: 1741: 1738: 1737: 1057:10.1002/spp2.1277 578:Taxonomic history 545:Liantuoia inflata 531:in Hubei, China, 484:frontal appendage 342: 341: 336: 332:Liantuoia inflata 324: 299: 287: 244: 1909: 1862: 1861: 1849: 1848: 1836: 1835: 1823: 1822: 1810: 1809: 1808: 1795: 1794: 1793: 1763: 1750: 1713:Aegirocassisinae 1623: 1591:Tamisiocarididae 1550:Amplectobeluidae 1508:Anomalocarididae 1459: 1448: 1398: 1391: 1384: 1375: 1370: 1368: 1367: 1334: 1333: 1289: 1283: 1278: 1272: 1266: 1260: 1254: 1248: 1247: 1239: 1233: 1229: 1223: 1222: 1178: 1172: 1171: 1139: 1130: 1129: 1117: 1108: 1107: 1075: 1069: 1068: 1036: 1030: 1029: 997: 988: 987: 977: 937: 931: 930: 874: 868: 867: 819: 808: 807: 773: 765: 756: 752: 742: 724: 692: 478: 466: 454: 433: 421: 334: 329: 322: 317: 297: 292: 285: 281: 258: 239: 232: 219: 206: 193: 153: 152: 134: 113: 103: 40: 29:Temporal range: 21: 1917: 1916: 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412: 411: 384:H. triangulata 372: 369: 340: 339: 338: 337: 325: 310: 309: 303: 302: 301: 300: 288: 283:H. triangulata 274: 273: 272:Other species 269: 268: 265: 253: 252: 246: 245: 228: 224: 223: 215: 211: 210: 202: 198: 197: 189: 185: 184: 179: 175: 174: 169: 165: 164: 159: 155: 154: 141: 140: 136: 135: 127: 126: 124:H. triangulata 115: 114: 106: 105: 97: 92: 87: 82: 77: 72: 67: 62: 57: 52: 47: 42: 41: 28: 15: 13: 10: 9: 6: 4: 3: 2: 1914: 1903: 1900: 1898: 1895: 1893: 1890: 1888: 1885: 1883: 1880: 1879: 1877: 1860: 1855: 1851: 1847: 1842: 1838: 1834: 1829: 1825: 1821: 1816: 1812: 1807: 1801: 1797: 1792: 1786: 1782: 1781: 1779: 1777: 1773: 1769: 1764: 1749: 1731: 1730: 1726: 1724: 1723: 1719: 1718: 1716: 1714: 1710: 1703: 1702: 1698: 1696: 1695: 1694:Ursulinacaris 1691: 1689: 1688: 1684: 1682: 1681: 1677: 1675: 1674: 1670: 1668: 1667: 1663: 1661: 1660: 1656: 1654: 1653: 1649: 1647: 1646: 1642: 1640: 1639: 1635: 1633: 1632: 1628: 1627: 1624: 1621: 1619: 1615: 1609: 1608: 1604: 1602: 1601: 1597: 1596: 1594: 1592: 1588: 1582: 1581: 1577: 1575: 1574: 1570: 1568: 1567: 1566:Guanshancaris 1563: 1561: 1560: 1559:Amplectobelua 1556: 1555: 1553: 1551: 1547: 1541: 1540: 1536: 1534: 1533: 1529: 1526: 1525: 1521: 1519: 1518: 1514: 1513: 1511: 1509: 1505: 1499: 1498: 1494: 1492: 1491: 1487: 1485: 1484: 1480: 1477: 1476: 1472: 1469: 1468: 1467:Caryosyntrips 1464: 1463: 1460: 1457: 1454: 1449: 1445: 1439: 1436: 1432: 1430: 1429:Panarthropoda 1426: 1424: 1421:Superphylum: 1420: 1418: 1414: 1413: 1410: 1406: 1399: 1394: 1392: 1387: 1385: 1380: 1379: 1376: 1361: 1357: 1353: 1351: 1345: 1344: 1340: 1331: 1327: 1323: 1319: 1315: 1311: 1307: 1303: 1300:(5): 451–65. 1299: 1295: 1288: 1285: 1282: 1277: 1274: 1270: 1265: 1262: 1258: 1253: 1250: 1245: 1238: 1235: 1228: 1225: 1220: 1216: 1212: 1208: 1204: 1200: 1196: 1192: 1188: 1184: 1177: 1174: 1169: 1165: 1161: 1157: 1153: 1149: 1145: 1138: 1136: 1132: 1127: 1123: 1116: 1114: 1110: 1105: 1101: 1097: 1093: 1089: 1085: 1081: 1074: 1071: 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Retrieved 1355: 1349: 1297: 1293: 1287: 1276: 1264: 1252: 1243: 1237: 1227: 1186: 1182: 1176: 1151: 1147: 1143: 1125: 1121: 1087: 1083: 1073: 1048: 1044: 1034: 1009: 1005: 949: 945: 935: 886: 882: 872: 831: 827: 823: 779: 775: 704: 700: 690: 659: 657: 652: 648: 644: 640: 636: 632:Anomalocaris 630: 621: 616: 612:nomen dubium 610: 606: 602: 594: 590: 582: 581: 571: 560: 552: 544: 540: 533:Pioche Shale 525:Spence Shale 520: 512: 511: 508:Distribution 497: 496: 481: 443: 439:Cambroraster 437: 406: 402:Aegirocassis 400: 388: 383: 379: 375: 374: 345: 344: 343: 331: 319: 294: 282: 260: 259: 250:Type species 234: 233: 195:Dinocaridida 123: 119: 31:Mid Cambrian 24: 18: 1800:Wikispecies 1687:Titanokorys 1631:Buccaspinea 1580:Ramskoeldia 1532:Lenisicaris 1490:Laminacaris 707:(1): 3774. 619:, in 1962. 591:H. victoria 521:H. victoria 380:H. victoria 371:Description 120:H. victoria 1892:Radiodonta 1876:Categories 1453:Radiodonta 1438:Arthropoda 1435:Stem-group 1405:Radiodonta 1366:2023-01-21 1090:: 109947. 754:Dryad Data 682:References 599:Mount Hurd 565:Ordovician 208:Radiodonta 182:Arthropoda 122:(top) and 1659:Pahvantia 1618:Hurdiidae 1573:Lyrarapax 1423:Ecdysozoa 1415:Kingdom: 1219:131622496 1104:0031-0182 1065:2056-2799 1026:0022-3360 966:0962-8452 927:205242881 911:1476-4687 864:206517995 796:1477-2019 731:2041-1723 574:as well. 555:from the 547:from the 393:sclerites 361:radiodont 295:H. hospes 221:Hurdiidae 168:Kingdom: 162:Eukaryota 1820:11593162 1791:Q1931926 1785:Wikidata 1539:Shucaris 1524:Houcaris 1433:Phylum: 1417:Animalia 1360:Archived 1330:53646959 1322:20173022 1168:86465719 984:34284622 919:25762145 856:19299617 804:86465719 749:30218075 670:See also 365:Cambrian 307:Synonyms 214:Family: 178:Phylum: 172:Animalia 158:Domain: 1846:1371156 1833:4666719 1666:Peytoia 1427:Clade: 1302:Bibcode 1294:PALAIOS 1244:Rotunda 1211:1306391 1191:Bibcode 975:8292756 891:Bibcode 836:Bibcode 828:Science 740:6138677 709:Bibcode 653:Peytoia 607:Amiella 603:Amiella 502:benthic 493:Ecology 358:hurdiid 351:extinct 241:Walcott 227:Genus: 201:Order: 188:Class: 1806:Hurdia 1776:Hurdia 1652:Hurdia 1328:  1320:  1217:  1209:  1166:  1144:Hurdia 1102:  1063:  1024:  982:  972:  964:  925:  917:  909:  883:Nature 862:  854:  824:Hurdia 802:  794:  747:  737:  729:  660:Hurdia 649:Hurdia 637:Hurdia 583:Hurdia 572:Hurdia 513:Hurdia 498:Hurdia 482:Hurdia 444:Hurdia 407:Hurdia 389:Hurdia 376:Hurdia 349:is an 346:Hurdia 243:, 1912 235:Hurdia 25:Hurdia 1841:IRMNG 1326:S2CID 1318:JSTOR 1215:S2CID 1207:JSTOR 1164:S2CID 923:S2CID 860:S2CID 800:S2CID 609:is a 397:gills 354:genus 1859:7373 1828:GBIF 1128:(6). 1100:ISSN 1061:ISSN 1022:ISSN 980:PMID 962:ISSN 915:PMID 907:ISSN 852:PMID 792:ISSN 745:PMID 727:ISSN 647:and 639:and 543:and 44:Preκž’ 1815:EoL 1310:doi 1232:11. 1199:doi 1156:doi 1092:doi 1088:558 1053:doi 1014:doi 970:PMC 954:doi 950:288 899:doi 887:522 844:doi 832:323 784:doi 735:PMC 717:doi 356:of 1878:: 1856:: 1843:: 1830:: 1817:: 1802:: 1787:: 1354:. 1324:. 1316:. 1308:. 1298:21 1296:. 1213:. 1205:. 1197:. 1187:70 1185:. 1162:. 1152:11 1150:. 1134:^ 1126:57 1124:. 1112:^ 1098:. 1086:. 1082:. 1059:. 1047:. 1043:. 1020:. 1010:92 1008:. 1004:. 992:^ 978:. 968:. 960:. 948:. 944:. 921:. 913:. 905:. 897:. 885:. 881:. 858:. 850:. 842:. 830:. 812:^ 798:. 790:. 780:11 778:. 774:. 760:^ 743:. 733:. 725:. 715:. 703:. 699:. 94:Pg 38:Ma 33:, 1704:? 1527:? 1478:? 1470:? 1397:e 1390:t 1383:v 1369:. 1352:" 1348:" 1332:. 1312:: 1304:: 1271:. 1259:. 1221:. 1201:: 1193:: 1170:. 1158:: 1106:. 1094:: 1067:. 1055:: 1049:7 1028:. 1016:: 986:. 956:: 929:. 901:: 893:: 866:. 846:: 838:: 806:. 786:: 751:. 719:: 711:: 705:9 330:? 328:† 318:? 316:† 293:? 291:† 280:† 257:† 231:† 218:† 205:† 192:† 99:N 89:K 84:J 79:T 74:P 69:C 64:D 59:S 54:O 49:κž’

Index

Mid Cambrian
Ma
Preκž’
κž’
O
S
D
C
P
T
J
K
Pg
N


Scientific classification
Edit this classification
Eukaryota
Animalia
Arthropoda
Dinocaridida
Radiodonta
Hurdiidae
Hurdia
Walcott
Type species
Synonyms
extinct
genus

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