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Nassellaria

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surrounding a latticed shell. These three skeleton types can be mixed and matched to create seven skeleton categories in nassellarians. Even the simplest classifications of nassellarian morphology is complicated because of the wide variety of morphologies in the nassellarian order even when compared with their sister group, the spumellarians. The innate nature of the nassellarian geometry lends itself to diversity, which may be one of the factors leading to the rapid diversification of the nassellarians in comparison to the spumellarians during the
31: 222:. These organisms are unicellular eukaryotic heterotrophic plankton typically with a siliceous cone-shaped skeleton. The most common group of radiolarians are the polycystine radiolarians, which are divided into two subgroups: the spumellarians and the nassellarians. Both spumellarians and nassellarians are common 295:
are connected by a web of rhizopodia throughout the extracapsulum. Fusules connect the intracapsulum (central capsule) to the extracapsulum. Axopodia and additional fusules extend out of the basal opening and through the pores in the skeleton. These will act as feeding apparatuses for the nassellarian.
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that extend out of the basal aperture and is surrounded by shorter terminal projections which form a terminal cone around the axial projection. The feeding in segmented Nassellarians is done in three phases: 1) extension, 2) capture, and 3) retraction. The geometry of nasselarians is quite beneficial
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at a central point. The three spicules are arranged in a single plane so that they are 120 degrees apart from each other. This is typically referred to as a “tripod” structure. The second skeleton type common in nassellarians is the aforementioned conical, porous skeleton. The third type is of a ring
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Many nassellarians are segmented, meaning there are circular skeletal divisions that exist equatorially along the skeletal cone. These divisions are called strictures. The strictures divide the organism into segments, typically giving it a more bulbous shape. Some nassellarians also exhibit spines
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end is usually in the shape of a hollow circle, giving the skeleton a conical look. Surrounding the central capsule, but still inside of the skeleton, is the extracapsulum. This material is primarily alveoli, gas-filled bubble-like structures that regulate the buoyancy of the organism. The alveoli
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and are important in stratigraphical dating, as the oldest radiolarians are Precambrian in age. The nassellarians appear in the fossil record much later than their other polycystine relatives, the spumellarians. spumellarians can be seen as far back as the Precambrian, whereas nassellarians do not
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A second variety of nassellarians feed without using an axial projection at all. These organisms instead form a wide terminal cone, which they cast out behind them from the basal aperture like a fishing net. The three phases of feeding used by segmented nassellarians are also evident in these
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compared to non symbiont-bearing calcareous organisms. If fossil evidence can be gathered for isotopic ratio analysis, the time window for appearance of algal symbionts with nassellarians and/or spumellarians should be able to be restricted in geologic time.
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species, but the evolution and timing of this symbiosis is currently unknown, as the symbiotic algae do not leave behind hard skeletons to fossilize. It may be possible to answer this question using isotopic analysis, as algal symbionts preferentially uptake
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Nassellarians have been and continue to be some of the most remarkable and aesthetically interesting protists both alive and in the fossil record. They occupy an important role ecologically and have done so since the
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for the dinoflagellate, while the dinoflagellate provides the nassellarian with a mucous membrane useful for hunting and protection against harmful invaders. There is evidence from small subunit ribosomal
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for this feeding mechanism, as food passes through the basal aperture, which is much larger than the pores in the rest of the skeleton, which is how most spumellarians must transport food.
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period, during which nassellarian fauna experienced a sharp increase in diversity. Nassellarian and spumellarian diversities have been relatively similar since the
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analysis of these dinoflagellate symbionts that dinoflagellate symbiosis with radiolarians evolved independently of other dinoflagellate symbioses (e.g.
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of the Nassellarian order as described by Anderson and Boltovsky et al. is of an egg-shaped central capsule (the part of the cell containing one or more
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nassellarians. These “fishing net” nassellarians are much easier to see feeding in the wild and present quite a spectacular sight.
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from the apical end or along the lateral sides of the cone. Spines along the basal aperture of the organism are called feet.
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There exist three basic types of nassellarian skeletons. The first is formed from the connection of three elongate
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Nassellarians feed on other plankton such as small algae, bacteria, diatoms, and small zooplankton.
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events and a rise in both spumellarian and nassellarian diversity during the
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Boltovskoy, Demetrio; Anderson, O. Roger; Correa, Nancy M. (2017).
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Symbioses between algae and radiolarians is observed frequently in
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radiolarian fossil history is dominated by Spumellaria until the
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out of the basal opening. The axial projection is a very long
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Nassellarian feeding is mainly done through extension of
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Springer, Cham. pp. 731–763. 713: 711: 709: 691: 689: 687: 685: 683: 681: 679: 677: 675: 673: 14: 805:Matsuoka, Atsushi (2007-09-01). 613:, with drops in diversity after 514: 500: 486: 472: 458: 444: 430: 413: 399: 382: 365: 350: 333: 319: 305: 16:Order of single-celled organisms 757:Molecular Biology and Evolution 1: 660:"Radiolaria.org > Miocene" 811:Swiss Journal of Geosciences 728:10.1007/978-3-319-28149-0_19 214:Nassellaria is an order of 2152: 231:begin to appear until the 1898: 1659: 1552: 1535: 1407: 1295: 1227: 1195: 1170: 1105: 997: 881: 824:10.1007/s00015-007-1228-y 550:Many nassellarians house 290:end of the skeleton. The 142: 135: 39:Scientific classification 37: 28: 23: 720:Handbook of the Protists 698:Anderson, O. R. (1983). 452:Lychnocanium ventricosum 438:Lithochytris pyramidalis 327:Anthocyrtis grossularia 202:belonging to the class 2090:Paleobiology Database 313:Anthocyrtium hispidum 1911:organization type: 637:become enriched in 522:Theocotylissa ficus 466:Podocyrtis princeps 2131:Radiolarian orders 1545:    1541:    508:Podocyrtis papalis 494:Podocyrtis papalis 2118: 2117: 2077:Open Tree of Life 1955:Taxon identifiers 1946: 1945: 1929:heliozoan amoebae 1921:amoeboflagellates 1885:Labyrinthomyxidae 1859: 1858: 1855: 1854: 1851: 1850: 1847: 1846: 1804:Globigerinitoidea 1655: 1654: 1651: 1650: 1531: 1530: 1527: 1526: 1490: 1489: 1403: 1402: 1399: 1398: 1395: 1394: 1391: 1390: 1387: 1386: 1383: 1382: 1379: 1378: 1314:Phaeogymnocellida 1291: 1290: 1287: 1286: 1223: 1222: 1210:Paracercomonadida 1166: 1165: 1101: 1100: 407:Eusyringium sipho 193: 192: 2143: 2111: 2110: 2098: 2097: 2085: 2084: 2072: 2071: 2062: 2061: 2049: 2048: 2036: 2035: 2023: 2022: 2010: 2009: 1997: 1996: 1995: 1982: 1981: 1980: 1950: 1738:Silicoloculinida 1672: 1668: 1661: 1565: 1561: 1554: 1550: 1546: 1537: 1517:Plasmodiophorida 1427: 1420: 1416: 1409: 1297: 1274:Thaumatomonadida 1262: 1229: 1193: 1183: 1179: 1172: 1125: 1118: 1114: 1107: 1022: 1012: 1008: 999: 910: 890: 867: 860: 853: 844: 837: 836: 826: 802: 791: 790: 772: 763:(9): 1192–1197. 748: 742: 741: 715: 704: 703: 695: 668: 667: 656: 518: 504: 490: 480:Podocyrtis mitra 476: 462: 448: 434: 417: 403: 386: 369: 354: 337: 323: 309: 218:under the class 146:Archiphormididae 33: 21: 2151: 2150: 2146: 2145: 2144: 2142: 2141: 2140: 2121: 2120: 2119: 2114: 2106: 2101: 2093: 2088: 2080: 2075: 2067: 2065: 2057: 2052: 2044: 2039: 2031: 2026: 2018: 2013: 2005: 2000: 1991: 1990: 1985: 1976: 1975: 1970: 1957: 1947: 1942: 1925:testate amoebae 1894: 1843: 1808: 1787:Globotruncanida 1747: 1708: 1664: 1647: 1614: 1610:Symphyacanthida 1581: 1557: 1540: 1523: 1486: 1462:Claustrosporida 1448: 1412: 1375: 1283: 1260: 1219: 1175: 1162: 1144: 1110: 1097: 1074: 1041: 1002: 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1757: 1755: 1749: 1748: 1746: 1745: 1740: 1735: 1730: 1725: 1718: 1716: 1710: 1709: 1707: 1706: 1699: 1693: 1691:Xenophyophorea 1688: 1681: 1679: 1669: 1657: 1656: 1653: 1652: 1649: 1648: 1646: 1645: 1640: 1635: 1630: 1624: 1622: 1616: 1615: 1613: 1612: 1607: 1602: 1600:Chaunocanthida 1597: 1595:Arthracanthida 1591: 1589: 1583: 1582: 1580: 1579: 1573: 1571: 1562: 1547: 1533: 1532: 1529: 1528: 1525: 1524: 1522: 1521: 1520: 1519: 1514: 1504: 1498: 1496: 1492: 1491: 1488: 1487: 1485: 1484: 1479: 1474: 1469: 1464: 1458: 1456: 1450: 1449: 1447: 1446: 1441: 1435: 1433: 1424: 1417: 1405: 1404: 1401: 1400: 1397: 1396: 1393: 1392: 1389: 1388: 1385: 1384: 1381: 1380: 1377: 1376: 1374: 1373: 1371:Ventricleftida 1368: 1363: 1362: 1361: 1356: 1351: 1343: 1342: 1341: 1336: 1331: 1326: 1324:Phaeosphaerida 1321: 1316: 1305: 1303: 1293: 1292: 1289: 1288: 1285: 1284: 1282: 1281: 1276: 1270: 1268: 1259: 1258: 1253: 1248: 1246:Spongomonadida 1243: 1237: 1235: 1225: 1224: 1221: 1220: 1218: 1217: 1212: 1207: 1202: 1200:Glissomonadida 1196: 1190: 1180: 1168: 1167: 1164: 1163: 1161: 1160: 1154: 1152: 1146: 1145: 1143: 1142: 1137: 1131: 1129: 1122: 1115: 1103: 1102: 1099: 1098: 1096: 1095: 1090: 1088:Chlorarachnida 1084: 1082: 1076: 1075: 1073: 1072: 1067: 1062: 1060:Desmothoracida 1057: 1051: 1049: 1043: 1042: 1040: 1039: 1034: 1028: 1026: 1019: 1016:Reticulofilosa 1009: 995: 994: 991: 990: 989: 988: 987: 986: 983:Mesomycetozoea 980: 975: 965: 955: 954: 953: 948: 943: 938: 933: 932: 931: 919:Diaphoretickes 916: 911: 906: 901: 896: 891: 883: 882: 879: 878: 876:classification 872: 870: 869: 862: 855: 847: 839: 838: 817:(2): 273–279. 792: 743: 736: 705: 669: 664:radiolaria.org 650: 649: 647: 644: 598: 597:Fossil History 595: 563:carbon dioxide 552:dinoflagellate 547: 544: 527: 526: 520: 513: 511: 506: 499: 497: 492: 485: 483: 478: 471: 469: 464: 457: 455: 450: 443: 441: 436: 429: 426: 425: 419: 412: 410: 405: 398: 396: 388: 381: 379: 371: 364: 362: 356: 349: 347: 339: 332: 330: 325: 318: 316: 311: 304: 301: 300: 256: 253: 211: 208: 191: 190: 189: 188: 186:Trissocyclidae 183: 178: 173: 168: 163: 158: 156:Cannobotryidae 153: 151:Artostrobiidae 148: 140: 139: 133: 132: 126: 120: 118: 114: 113: 108: 106: 102: 101: 96: 94: 90: 89: 84: 82: 78: 77: 72: 70: 66: 65: 60: 58: 54: 53: 48: 46: 42: 41: 35: 34: 26: 25: 15: 13: 10: 9: 6: 4: 3: 2: 2148: 2137: 2134: 2132: 2129: 2128: 2126: 2109: 2104: 2100: 2096: 2091: 2087: 2083: 2078: 2074: 2070: 2064: 2060: 2055: 2051: 2047: 2042: 2038: 2034: 2029: 2025: 2021: 2016: 2012: 2008: 2003: 1999: 1994: 1988: 1984: 1979: 1973: 1969: 1968: 1966: 1964: 1960: 1956: 1951: 1938: 1934: 1930: 1926: 1922: 1918: 1914: 1910: 1907: 1905: 1901: 1900: 1897: 1891: 1888: 1886: 1883: 1881: 1878: 1876: 1875: 1871: 1870: 1868: 1866: 1862: 1840: 1837: 1835: 1834: 1830: 1828: 1825: 1823: 1820: 1819: 1817: 1815: 1811: 1805: 1802: 1800: 1796: 1794: 1790: 1788: 1784: 1782: 1781:Globigerinida 1779: 1777: 1774: 1772: 1769: 1767: 1764: 1762: 1759: 1758: 1756: 1754: 1753:Globothalamea 1750: 1744: 1741: 1739: 1736: 1734: 1731: 1729: 1726: 1724: 1720: 1719: 1717: 1715: 1711: 1705: 1704: 1700: 1697: 1694: 1692: 1689: 1686: 1683: 1682: 1680: 1677: 1673: 1670: 1667: 1662: 1658: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1626: 1625: 1623: 1621: 1617: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1592: 1590: 1588: 1584: 1578: 1575: 1574: 1572: 1570: 1569:Sticholonchea 1566: 1563: 1560: 1555: 1551: 1548: 1544: 1538: 1534: 1518: 1515: 1513: 1510: 1509: 1508: 1505: 1503: 1500: 1499: 1497: 1493: 1483: 1480: 1478: 1475: 1473: 1470: 1468: 1465: 1463: 1460: 1459: 1457: 1455: 1451: 1445: 1442: 1440: 1437: 1436: 1434: 1432: 1428: 1425: 1421: 1418: 1415: 1410: 1406: 1372: 1369: 1367: 1366:Tectofilosida 1364: 1360: 1357: 1355: 1352: 1350: 1347: 1346: 1344: 1340: 1339:Phaeoconchida 1337: 1335: 1332: 1330: 1327: 1325: 1322: 1320: 1317: 1315: 1312: 1311: 1310: 1307: 1306: 1304: 1302: 1298: 1294: 1280: 1277: 1275: 1272: 1271: 1269: 1267: 1266:Silicofilosea 1263: 1257: 1254: 1252: 1249: 1247: 1244: 1242: 1239: 1238: 1236: 1234: 1230: 1226: 1216: 1215:Cercomonadida 1213: 1211: 1208: 1206: 1203: 1201: 1198: 1197: 1194: 1191: 1188: 1184: 1181: 1178: 1173: 1169: 1159: 1156: 1155: 1153: 1151: 1147: 1141: 1140:Metromonadida 1138: 1136: 1133: 1132: 1130: 1126: 1123: 1119: 1116: 1113: 1108: 1104: 1094: 1091: 1089: 1086: 1085: 1083: 1081: 1080:Chlorarachnea 1077: 1071: 1068: 1066: 1065:Leucodictyida 1063: 1061: 1058: 1056: 1053: 1052: 1050: 1048: 1044: 1038: 1035: 1033: 1030: 1029: 1027: 1023: 1020: 1017: 1013: 1010: 1006: 1000: 996: 984: 981: 979: 976: 974: 971: 970: 969: 966: 964: 961: 960: 959: 956: 952: 949: 947: 946:Stramenopiles 944: 942: 939: 937: 934: 930: 927: 926: 925: 922: 921: 920: 917: 915: 912: 909:(major groups 907: 905: 902: 900: 897: 895: 892: 889: 885: 884: 880: 875: 868: 863: 861: 856: 854: 849: 848: 845: 834: 830: 825: 820: 816: 812: 808: 801: 799: 797: 793: 788: 784: 780: 776: 771: 766: 762: 758: 754: 747: 744: 739: 737:9783319281476 733: 729: 725: 721: 714: 712: 710: 706: 701: 694: 692: 690: 688: 686: 684: 682: 680: 678: 676: 674: 670: 665: 661: 655: 652: 645: 643: 640: 636: 632: 627: 622: 620: 616: 612: 608: 607:Carboniferous 604: 596: 594: 591: 587: 584: 580: 575: 573: 569: 564: 560: 556: 553: 545: 543: 539: 537: 532: 523: 517: 512: 509: 503: 498: 495: 489: 484: 481: 475: 470: 467: 461: 456: 453: 447: 442: 439: 433: 428: 422: 416: 411: 408: 402: 397: 393: 392: 385: 380: 376: 375: 368: 363: 359: 353: 348: 344: 343: 336: 331: 328: 322: 317: 314: 308: 303: 298: 297: 296: 293: 289: 285: 281: 277: 273: 269: 265: 262: 254: 252: 250: 246: 240: 238: 234: 233:Carboniferous 229: 225: 221: 217: 209: 207: 205: 201: 197: 187: 184: 182: 179: 177: 174: 172: 169: 167: 164: 162: 161:Carpocaniidae 159: 157: 154: 152: 149: 147: 144: 143: 141: 138: 134: 129: 123: 119: 116: 115: 111: 107: 104: 103: 99: 95: 92: 91: 87: 83: 80: 79: 75: 71: 68: 67: 63: 59: 56: 55: 51: 47: 44: 43: 40: 36: 32: 27: 22: 19: 1962: 1904:paraphyletic 1874:Lapot gusevi 1872: 1864: 1833:Heterogromia 1831: 1822:Involutinida 1813: 1761:Textulariida 1743:Ammodiscidae 1733:Spirillinida 1714:Tubothalamea 1703:Reticulomyxa 1701: 1696:Astrorhizida 1685:Allogromiida 1676:Monothalamea 1666:Foraminifera 1632: 1620:Polycystinea 1605:Holocanthida 1502:Vampyrellida 1467:Haplosporida 1454:Ascetosporea 1444:Reticulosida 1349:Cryomonadida 1334:Phaeogromida 1329:Phaeocalpida 1319:Phaeocystida 1301:Thecofilosea 1256:Variglissida 1251:Marimonadida 1187:Sarcomonadea 1177:Ventrifilosa 1128:Metromonadea 1112:Monadofilosa 1055:Cryptofilida 1047:Granofilosea 1032:Aquavolonida 968:Opisthokonta 814: 810: 760: 756: 746: 719: 699: 663: 654: 635:Foraminifera 623: 600: 592: 588: 583:pseudopodium 576: 572:foraminifera 549: 540: 528: 521: 507: 493: 479: 465: 451: 437: 421:Lychnocanoma 420: 406: 389: 372: 357: 340: 326: 312: 276:mitochondria 272:Golgi bodies 258: 241: 228:microfossils 213: 210:Introduction 195: 194: 121: 110:Polycystinea 69:(unranked): 57:(unranked): 24:Nassellaria 18: 2028:iNaturalist 1993:Nassellaria 1987:Wikispecies 1963:Nassellaria 1937:fungus-like 1913:flagellates 1776:Carterinida 1771:Robertinida 1638:Spumellaria 1633:Nassellaria 1512:Phagomyxida 1495:Proteomyxia 1472:Mikrocytida 1070:Limnofilida 1025:Skiomonadea 579:pseudopodia 391:Eucyrtidium 358:Calocycloma 342:Artostrobus 245:Precambrian 220:Polycystina 196:Nassellaria 181:Theoperidae 166:Collozoidae 122:Nassellaria 93:Subphylum: 2125:Categories 1839:Komokiacea 1723:Fusulinida 1628:Collodaria 1587:Acantharea 1577:Taxopodida 1559:Radiolaria 1507:Phytomyxea 1482:Paramyxida 1477:Paradinida 1309:Phaeodarea 1279:Euglyphida 1233:Imbricatea 1205:Katabiidae 1093:Minorisida 700:Radiolaria 646:References 619:Quaternary 374:Calocyclas 264:morphology 255:Morphology 216:Radiolaria 204:Radiolaria 98:Radiolaria 1766:Rotaliida 1728:Miliolida 1431:Gromiidea 1423:Marimyxia 1345:Eothecia 1241:Krakenida 1158:Helkesida 1135:Metopiida 1037:Tremulida 963:Amoebozoa 941:Alveolata 929:Cryptista 904:Eukaryota 833:1661-8726 779:0737-4038 639:carbon-13 631:carbon-12 603:Paleozoic 555:symbionts 299:skeletons 280:lysosomes 226:-forming 128:Ehrenberg 50:Eukaryota 1978:Q3870511 1972:Wikidata 1908:†extinct 1827:Lagenida 1643:Orodaria 1439:Gromiida 1414:Endomyxa 1359:Matazida 1354:Ebriacea 1150:Helkesea 1121:Eoglissa 1005:Cercozoa 958:Amorphea 936:Rhizaria 924:Hacrobia 914:Excavata 899:Bacteria 874:Rhizaria 611:Mesozoic 559:ammonium 536:Cenozoic 531:spicules 261:holotype 249:protists 237:Cenozoic 200:Rhizaria 137:Families 81:Phylum: 74:Rhizaria 45:Domain: 2020:5955735 2007:2911291 1917:amoebae 1543:Retaria 973:Animals 894:Archaea 787:8896371 546:Ecology 117:Order: 105:Class: 86:Retaria 2108:235741 2082:137460 2066:NZOR: 2059:278980 2033:152402 1007:  1003:  951:Plants 888:Domain 831:  785:  777:  734:  626:extant 601:Early 288:apical 284:silica 268:nuclei 130:, 1875 2103:WoRMS 2046:10146 2041:IRMNG 978:Fungi 292:basal 224:chert 2054:NCBI 2015:GBIF 829:ISSN 783:PMID 775:ISSN 732:ISBN 561:and 259:The 2095:402 2002:EoL 819:doi 815:100 765:doi 724:doi 568:DNA 524:sp. 423:sp. 394:sp. 377:sp. 360:sp. 345:sp. 62:SAR 2127:: 2105:: 2092:: 2079:: 2056:: 2043:: 2030:: 2017:: 2004:: 1989:: 1974:: 1935:; 1931:; 1927:; 1923:; 1919:; 1915:; 827:. 813:. 809:. 795:^ 781:. 773:. 761:13 759:. 755:. 730:. 708:^ 672:^ 662:. 621:. 538:. 278:, 274:, 270:, 239:. 1939:. 1902:* 1797:† 1791:† 1785:† 1721:† 1698:* 1687:* 1678:* 1189:* 1018:* 985:) 866:e 859:t 852:v 835:. 821:: 789:. 767:: 740:. 726:: 666:.

Index


Scientific classification
Eukaryota
SAR
Rhizaria
Retaria
Radiolaria
Polycystinea
Ehrenberg
Families
Archiphormididae
Artostrobiidae
Cannobotryidae
Carpocaniidae
Collozoidae
Plagiacanthidae
Pterocorythidae
Theoperidae
Trissocyclidae
Rhizaria
Radiolaria
Radiolaria
Polycystina
chert
microfossils
Carboniferous
Cenozoic
Precambrian
protists
holotype

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