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Holomastigotoides

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lining that has been suggested to be a microtubule organizing centre for the axostyle. The size of parabasal fibers decreases as they extend further past the apex, to the point where they cannot be observed in the mid-region or base of the cell. Parabasal fibers are densely concentrated in the cell's apex, and axostyles closely associated with the parabasal fibers also accumulate in this location. The fibrous ribbon is a long sheet that looks like an accordion, and connects all the basal bodies in an individual flagellar band. An individual fibrous ribbon is as long as the length of an individual flagellar body. KI fibers are named for their distinctive shape, and specifically link basal bodies in triplets. KI fibers can change shape, which also changes the distance between basal bodies and regulates how close or far they are from each other. The fibrous ribbon and KI fiber are thought to have a role in controlling cell shape by moving the flagellar bands. They also play roles in regulating the direction a Holomastigotoides cell moves in, coordinating the beating of flagella, and assisting in accommodating large pieces of wood during phagocytosis.
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the cortical cytoplasm extend along the entire length of the flagellar bands. Some axostyles follow the spiral arrangement of the flagellar bands and regulate the positions of the Golgi bodies and endoplasmic reticulum in the cell. Notably, flagellar bands 4 and 5 are specialized, and possess extensions into the cytoplasm that contain the poles of the cell's extra-nuclear mitotic spindle.
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are more difficult to distinguish. As basal bodies become more widely spaced further away from the cell apex, the fiber types are also easier to distinguish. Basal bodies transition into flagella distally, and the transition point is indicated by a transition plate. An axosome is found between the transition plate and the central microtubules of an individual flagellum.
509:, telophase has been observed in greater detail. Telophase occurs via the separation and coiling of flagellar band. While this flagellar band coils, it pulls a daughter nucleus to the basal end of the cell. The number of flagellar bands in a daughter cell is determined by duplication of basal bodies at the end of cell division. 504:
has been observed to reproduce through asexual division. During cell division, the nucleus and chromosomes elongate longitudinally. A constriction forms in the middle of the nucleus until two daughter nuclei are produced, effectively splitting the chromosomes in half so that each daughter nucleus has
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can easily be distinguished due to size, as one will be shorter than the other. As the chromosomes replicate, they uncoil and appear to extend in length. After replication, the sister chromatids re-coil and shorten before separating and pairing with their homologues. Chromosomes have been observed to
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Axostyles can be located along the entire length of a flagellar band. They can extend from the cytoplasm to the cell base and surround the nucleus. They can also be found in the cortical cytoplasm, which is the cytoplasm that falls between the plasma membrane and flagellar basal bodies. Axostyles in
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cells with energy. The hydrogenosomes are located either between the plasma membrane and flagellar basal bodies or dispersed throughout the cytoplasm. They are thought to accumulate near the basal bodies to support high energy demands of the flagella, and have been observed to divide independently.
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also possesses parabasal bodies, as is characteristic of parabasalids. The parabasal bodies consist of a Golgi body and a parabasal fiber, and are closely associated with the basal bodies of the flagella. Golgi bodies have been observed to overlap with parabasal fibers near the base of the nucleus.
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its characteristic, highly flagellated appearance. The basal bodies of a flagellar band are linked by a fiber system that consists of three different fiber types. Each flagellar band is associated with an axostyle, endoplasmic reticulum, and Golgi bodies. The high density of external flagella helps
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is attributed to the arrangement of its flagellar bands in a spiral formation around the cell. The flagellar bands originate from the anterior apex of the cell and spiral posteriorly in progressively larger spirals, wrapping around the circumference of the cell. An individual flagellar band is made
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is unique in that it remains in the cell during most of the cell cycle, along with the flagella. Spindle poles are present to maintain spindle microtubules while the mitotic spindle is present. This is possible because cytoplasmic microtubules and mitotic microtubules have different origins in the
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Near the anterior apex of the cell, the basal bodies are arranged tightly together within the flagellar bands, to such an extent that some basal bodies will overlap with each other. The fiber system associated with the basal bodies is also compressed in this apical region, and thus the fiber types
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cells, there is a high concentration of centrin at the apex of the cell associated with the parabasal fibers, the flagellar bands, and the mitotic spindle. As these are sites where changes in cell shape and movement are initiated, this implies a possible role of centrin in controlling cell shape,
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The basal bodies of a flagellar band are linked by a fiber system, which consists of the parabasal fiber, fibrous ribbon, and KI fiber. The parabasal fiber provides a surface for microtubule formation, and there is one parabasal fiber for each flagellar band. The parabasal fiber possesses a dark
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insert into the nuclear envelope at the points of contact with the spindle poles. The nucleus maintains its characteristic position at the cell's apex through contact between kinetochores and spindle poles and apical parabasal fibers. In many other eukaryotic cells, most of the cytoplasmic
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has two forms: haploid and diploid. In the haploid form, it possesses two chromosomes. In the diploid form, it possesses four chromosomes. Forms with greater ploidies have also been observed, and ploidies can vary between individuals belonging to the same species of Holomastigotoides.
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is located in the anterior apex of the cell, and is associated with a mitotic spindle located outside of the nucleus. This mitotic spindle is persistent throughout most of the cell cycle, which is unusual for eukaryotic cells and characteristic of
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lives in hindguts of lower termites, where it feeds on wood and assists the termite in wood digestion. This allows the termite to access and use nutrients found in wood that they would not have been able to digest otherwise.
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Jasso-Selles, Daniel E.; De Martini, Francesca; Velenovsky, Joseph F.; Mee, Evan D.; Montoya, Samantha J.; Hileman, Jonathon T.; Garcia, Mikaela D.; Su, Nan-Yao; Chouvenc, Thomas; Gile, Gillian H. (November 2020).
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has been observed to change cell shape and direction of movement constantly. Intracellular calcium ion concentration affects centrin, which in turn can change flagellar band structure and basal body orientation.
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In the cytoplasm, food vacuoles are distributed widely and contain ingested wood. Ingested wood particles and glycogen have also been observed to be freely distributed throughout the cytoplasm.
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cell. The microtubules used for the cytoskeleton and mitosis are separate, and thus the cytoskeleton does not need to be disassembled for cell division to be initiated in
959:"The parabasalid symbiont community of Heterotermes aureus: Molecular and morphological characterization of four new species and reestablishment of the genus Cononympha" 834:
Gile, Gillian H.; James, Erick R.; Tai, Vera; Harper, James T.; Merrell, Trevor L.; Boscaro, Vittorio; HusnĂ­k, Filip; Scheffrahn, Rudolf H.; Keeling, Patrick J. (2018).
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Jasso-Selles, Daniel E.; De Martini, Francesca; Freeman, Katalina D.; Garcia, Mikaela D.; Merrell, Trevor L.; Scheffrahn, Rudolf H.; Gile, Gillian H. (October 2017).
895:"The Complete Protist Symbiont Communities of Coptotermes formosanus and Coptotermes gestroi : Morphological and Molecular Characterization of Five New Species" 1296: 768:"Morphology and molecular phylogeny of Pseudotrichonympha hertwigi and Pseudotrichonympha paulistana (Trichonymphea, parabasalia) from neotropical rhinotermitids" 1309: 345:
prevent pieces of ingested wood in the termite hindgut from contacting and damaging cell surfaces. The number of flagellar bands varies based on the species of
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Golgi bodies can be found on the interior side of flagellar bands, spaced evenly. Endoplasmic reticulum elements can be found between Golgi and basal bodies.
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is the high density of flagella on the cell surface, with some reports of up to 10 000 flagella on a single cell. The organization of the flagella in
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have terminal centromeres. Crossing over has been observed, possibly to prevent complete segregation or no segregation of the chromatids.
1038: 836:"New Species of Spirotrichonympha from Reticulitermes and the Relationships Among Genera in Spirotrichonymphea (Parabasalia)" 505:
the same chromosomes. Chromosome division has been observed to occur in a longitudinal direction, rather than transverse. In
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can be transferred from termite to termite by way of feeding on anal secretions of other termites during juvenile stages.
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Saldarriaga, Juan F.; Gile, Gillian H.; James, Erick R.; Horák, Ales; Scheffrahn, Rudolf H.; Keeling, Patrick J. (2011).
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has notably been studied to observe the mechanisms of chromosomal pairing and segregation in haploid and diploid cells.
1257: 448:. An extranuclear matrix surrounds the nuclear envelope, except at the points where it contacts the mitotic spindle. 1314: 349:. The posterior base of Holomastigotoides cells are not flagellated, and contain vesicles that are likely used for 247: 173:, in Brazil. After initial discovery, Giovanni Battista Grassi and Anna Foa reclassified Hartmann's “male” form of 579:
strictly co-speciated with its host termites, and other mechanisms are likely involved in the phenomena observed.
226: 470:. The persistence of the extra-nuclear mitotic spindle and presence of MPM-2, a mitotic protein, indicates that 240: 219: 212: 340:
up of many basal bodies arranged in a single row, and a single flagellum emerges from each basal body, giving
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Cleveland, Lemuel R. (1960). "Pairing and segregation in haploids and diploids of Holomastigotoides".
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branches separately from other genera in the Rhinotermitidae, implying the ancestral condition of
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has been ancestrally present in this group of termites. This is supported by the observation of
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cells. They are responsible for producing ATP when converting pyruvate to acetate, providing
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microtubules are dissociated to form the mitotic spindle. However, this is not the case in
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outside its nucleus during the majority of its cell cycle. As a symbiont of termites,
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in 1911, thus establishing the first use of the genus. The original host species of
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may have speciated alongside its host termites. However, the presence of multiple
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is a protein found in the cytoskeleton of eukaryotic cells, and plays a role in
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described by Hartmann was later invalidated due to lack of description, and
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was first described by Max Hartmann in 1910. Hartmann mistakenly identified
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within a single host species or a result of possible co-speciation between
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to reside in an individual host termite species. This may be a result of
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10.1002/(SICI)1097-0169(1997)36:4<377::AID-CM7>3.0.CO;2-2
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Cleveland, Lemuel R. (1947). "The origin and evolution of meiosis".
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is able to ingest wood and aid its host in digestion. In return,
1208: 1070:"The Whole Life Cycle of Chromosomes and Their Coiling Systems" 1023:"Centrin and the cytoskeleton of the protist Holomastigotoides" 278:
species have been found in multiple termite genera, including
686:"Ultrastructure of the Parabasalid Protist Holomastigotoides" 143:
is supplied with a stable habitat and steady supply of food.
127:. It is characterized by its dense, organized arrangement of 331:
is a cone-shaped cell. One of the most notable features of
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species in host species eliminates the possibility that
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spend most of their cell cycle in a suspended stage of
166:, which he observed living in a species of termite, 1217: 586:to form a monophyletic group with species found in 1074:Transactions of the American Philosophical Society 684:Lingle, Wilma L.; Salisbury, Jeffrey L. (1995). 8: 262:is an obligate symbiont of lower termites. 1205: 131:on the cell surface and the presence of a 20: 1175:"Memoirs: Observations on Trichonymphids" 1093: 543:and other genera in the Rhinotermitidae. 299:. It is possible for multiple species of 189:was subsequently named the type host for 1021:Lingle, W. L.; Salisbury, J. L. (1997). 599: 900:The Journal of Eukaryotic Microbiology 841:The Journal of Eukaryotic Microbiology 773:The Journal of Eukaryotic Microbiology 691:The Journal of Eukaryotic Microbiology 200:The following species are recognized: 162:as the female form of the parabasalid 1168: 1166: 1016: 1014: 1012: 679: 677: 675: 673: 671: 669: 667: 665: 663: 661: 659: 657: 655: 653: 651: 649: 647: 645: 643: 641: 639: 637: 635: 633: 631: 629: 627: 625: 623: 7: 1010: 1008: 1006: 1004: 1002: 1000: 998: 996: 994: 992: 952: 950: 948: 946: 887: 885: 883: 881: 879: 829: 827: 825: 823: 821: 819: 761: 759: 737: 735: 733: 731: 729: 621: 619: 617: 615: 613: 611: 609: 607: 605: 603: 402:direction of movement, and mitosis. 1173:Mackinnon, Doris L. (1926-04-01). 1027:Cell Motility and the Cytoskeleton 704:10.1111/j.1550-7408.1995.tb05895.x 14: 963:European Journal of Protistology 786:10.1111/j.1550-7408.2011.00575.x 35: 457:cells. The mitotic spindle of 422:, hydrogenosomes are found in 123:found in the hindgut of lower 1: 482:Chromosomes and cell division 357:Basal bodies and fiber system 193:as it is the only species of 16:Genus of flagellated protists 1141:10.1126/science.105.2724.287 582:There is strong support for 529:group, which suggests that 435:Nucleus and mitotic spindle 1372: 975:10.1016/j.ejop.2017.09.001 191:Holomastigotoides hertwigi 1187:10.1242/jcs.s2-70.278.173 1068:Cleveland, L. R. (1949). 745:Archiv fĂĽr Protistenkunde 324:Cell surface and flagella 105: 100: 32:Scientific classification 30: 23: 1181:. s2-70 (278): 173–191. 1179:Journal of Cell Science 1095:2027/coo.31924001826647 567:, which suggests that 540:Prorhinotermes simplex 557:Coptotermes testaceus 187:Coptotermes testaceus 164:Trichonympha hertwigi 1133:1947Sci...105..287C 493:The chromosomes of 255:Habitat and ecology 79:Holomastigotoididae 69:Spirotrichonymphida 197:native to Brazil. 1338: 1337: 1323:Open Tree of Life 1263:Holomastigotoides 1249:Holomastigotoides 1219:Holomastigotoides 1211:Taxon identifiers 1127:(2724): 287–289. 913:10.1111/jeu.12815 854:10.1111/jeu.12447 584:Holomastigotoides 577:Holomastigotoides 573:Holomastigotoides 569:Holomastigotoides 561:Holomastigotoides 553:Holomastigotoides 549:Holomastigotoides 535:Holomastigotoides 531:Holomastigotoides 519:Holomastigotoides 507:Holomastigotoides 502:Holomastigotoides 495:Holomastigotoides 487:Holomastigotoides 472:Holomastigotoides 468:Holomastigotoides 464:Holomastigotoides 459:Holomastigotoides 455:Holomastigotoides 446:Holomastigotoides 441:Holomastigotoides 428:Holomastigotoides 424:Holomastigotoides 404:Holomastigotoides 399:Holomastigotoides 366:Holomastigotoides 347:Holomastigotoides 342:Holomastigotoides 337:Holomastigotoides 333:Holomastigotoides 329:Holomastigotoides 313:Holomastigotoides 309:Holomastigotoides 301:Holomastigotoides 276:Holomastigotoides 274:Since discovery, 269:Holomastigotoides 264:Holomastigotoides 260:Holomastigotoides 183:Holomastigotoides 179:Holomastigotoides 160:Holomastigotoides 156:Holomastigotoides 145:Holomastigotoides 141:Holomastigotoides 137:Holomastigotoides 116:Holomastigotoides 112: 111: 96: 90:Holomastigotoides 25:Holomastigotoides 1363: 1331: 1330: 1318: 1317: 1305: 1304: 1292: 1291: 1279: 1278: 1266: 1265: 1253: 1252: 1251: 1238: 1237: 1236: 1206: 1199: 1198: 1170: 1161: 1160: 1114: 1108: 1107: 1097: 1065: 1059: 1058: 1018: 987: 986: 954: 941: 940: 889: 874: 873: 831: 814: 813: 763: 754: 753: 739: 724: 723: 681: 559:branch with two 94: 40: 39: 21: 1371: 1370: 1366: 1365: 1364: 1362: 1361: 1360: 1341: 1340: 1339: 1334: 1326: 1321: 1313: 1308: 1300: 1295: 1287: 1282: 1274: 1269: 1261: 1256: 1247: 1246: 1241: 1232: 1231: 1226: 1213: 1203: 1202: 1172: 1171: 1164: 1116: 1115: 1111: 1086:10.2307/1005635 1067: 1066: 1062: 1020: 1019: 990: 969:(Pt A): 48–63. 956: 955: 944: 891: 890: 877: 833: 832: 817: 765: 764: 757: 741: 740: 727: 683: 682: 601: 596: 523:Rhinotermitidae 517:The species of 515: 484: 439:The nucleus of 437: 413: 388: 379: 359: 326: 321: 315:and its hosts. 296:Anacanthotermes 257: 153: 133:mitotic spindle 93: 34: 17: 12: 11: 5: 1369: 1367: 1359: 1358: 1353: 1343: 1342: 1336: 1335: 1333: 1332: 1319: 1306: 1293: 1280: 1267: 1254: 1239: 1223: 1221: 1215: 1214: 1209: 1201: 1200: 1162: 1109: 1060: 1033:(4): 377–390. 988: 942: 907:(6): 626–641. 875: 848:(2): 159–169. 815: 780:(6): 487–496. 755: 725: 698:(5): 490–505. 598: 597: 595: 592: 514: 511: 483: 480: 436: 433: 412: 409: 387: 384: 378: 375: 358: 355: 325: 322: 320: 317: 286:Prorhinotermes 256: 253: 252: 251: 248:H. oxyrhynchus 244: 237: 230: 223: 216: 209: 152: 149: 119:is a genus of 110: 109: 103: 102: 98: 97: 86: 82: 81: 76: 72: 71: 66: 62: 61: 56: 52: 51: 46: 42: 41: 28: 27: 15: 13: 10: 9: 6: 4: 3: 2: 1368: 1357: 1354: 1352: 1349: 1348: 1346: 1329: 1324: 1320: 1316: 1311: 1307: 1303: 1298: 1294: 1290: 1285: 1281: 1277: 1272: 1268: 1264: 1259: 1255: 1250: 1244: 1240: 1235: 1229: 1225: 1224: 1222: 1220: 1216: 1212: 1207: 1196: 1192: 1188: 1184: 1180: 1176: 1169: 1167: 1163: 1158: 1154: 1150: 1146: 1142: 1138: 1134: 1130: 1126: 1122: 1121: 1113: 1110: 1105: 1101: 1096: 1091: 1087: 1083: 1079: 1075: 1071: 1064: 1061: 1056: 1052: 1048: 1044: 1040: 1036: 1032: 1028: 1024: 1017: 1015: 1013: 1011: 1009: 1007: 1005: 1003: 1001: 999: 997: 995: 993: 989: 984: 980: 976: 972: 968: 964: 960: 953: 951: 949: 947: 943: 938: 934: 930: 926: 922: 918: 914: 910: 906: 902: 901: 896: 888: 886: 884: 882: 880: 876: 871: 867: 863: 859: 855: 851: 847: 843: 842: 837: 830: 828: 826: 824: 822: 820: 816: 811: 807: 803: 799: 795: 791: 787: 783: 779: 775: 774: 769: 762: 760: 756: 752:(2): 163–172. 751: 747: 746: 738: 736: 734: 732: 730: 726: 721: 717: 713: 709: 705: 701: 697: 693: 692: 687: 680: 678: 676: 674: 672: 670: 668: 666: 664: 662: 660: 658: 656: 654: 652: 650: 648: 646: 644: 642: 640: 638: 636: 634: 632: 630: 628: 626: 624: 622: 620: 618: 616: 614: 612: 610: 608: 606: 604: 600: 593: 591: 589: 585: 580: 578: 574: 570: 566: 565:C. formosanus 562: 558: 554: 550: 546: 542: 541: 536: 532: 528: 524: 521:found in the 520: 512: 510: 508: 503: 499: 496: 491: 488: 481: 479: 477: 473: 469: 465: 460: 456: 451: 447: 442: 434: 432: 429: 425: 421: 416: 410: 408: 405: 400: 396: 395:cell division 392: 385: 383: 376: 374: 370: 367: 363: 356: 354: 352: 348: 343: 338: 334: 330: 323: 318: 316: 314: 310: 306: 302: 298: 297: 292: 291: 287: 283: 280:Coptotermes, 277: 272: 270: 265: 261: 254: 250: 249: 245: 243: 242: 238: 236: 235: 231: 229: 228: 224: 222: 221: 217: 215: 214: 210: 208: 207: 203: 202: 201: 198: 196: 192: 188: 184: 180: 176: 172: 170: 165: 161: 157: 150: 148: 146: 142: 138: 134: 130: 126: 122: 118: 117: 108: 104: 99: 95:Hartmann 1910 92: 91: 87: 84: 83: 80: 77: 74: 73: 70: 67: 64: 63: 60: 57: 54: 53: 50: 47: 44: 43: 38: 33: 29: 26: 22: 19: 1218: 1178: 1124: 1118: 1112: 1077: 1073: 1063: 1030: 1026: 966: 962: 904: 898: 845: 839: 777: 771: 749: 743: 695: 689: 587: 583: 581: 576: 572: 568: 564: 560: 556: 552: 548: 544: 538: 534: 530: 527:monophyletic 518: 516: 506: 501: 500: 494: 492: 486: 485: 471: 467: 463: 458: 454: 450:Kinetochores 445: 440: 438: 427: 423: 420:mitochondria 417: 414: 403: 398: 389: 386:Cytoskeleton 380: 371: 365: 364: 360: 351:phagocytosis 346: 341: 336: 332: 328: 327: 312: 308: 300: 294: 290:Psammotermes 282:Heterotermes 279: 275: 273: 268: 263: 259: 258: 246: 239: 232: 227:H. hartmanni 225: 218: 211: 204: 199: 194: 190: 186: 182: 178: 174: 167: 163: 159: 155: 154: 144: 140: 136: 121:parabasalids 115: 114: 113: 106: 89: 88: 24: 18: 1243:Wikispecies 1080:(1): 1–97. 588:Coptotermes 563:species in 555:species in 418:Instead of 241:H. mirabile 220:H. bigfooti 213:H. batututi 195:Coptotermes 175:T. hertwigi 169:Coptotermes 1351:Metamonads 1345:Categories 594:References 545:P. simplex 319:Morphology 305:speciation 59:Metamonada 1356:Symbiosis 1234:Q25373728 1195:1477-9137 1047:0886-1544 937:220284193 921:1066-5234 794:1550-7408 712:1066-5234 411:Cytoplasm 377:Axostyles 353:of wood. 206:H. aureus 107:See text 49:Eukaryota 1228:Wikidata 1149:17835147 983:28942092 929:32603489 862:28710832 810:40726800 802:21895839 720:83951229 513:Taxonomy 476:prophase 234:H. minor 151:Taxonomy 129:flagella 125:termites 101:Species 75:Family: 55:Phylum: 45:Domain: 1328:1065469 1302:1120203 1289:4893330 1157:2026926 1129:Bibcode 1120:Science 1104:1005635 1055:9096959 870:3684172 525:form a 391:Centrin 85:Genus: 65:Order: 1315:104085 1193:  1155:  1147:  1102:  1053:  1045:  981:  935:  927:  919:  868:  860:  808:  800:  792:  718:  710:  551:. Two 293:, and 1297:IRMNG 1153:S2CID 1100:JSTOR 933:S2CID 866:S2CID 806:S2CID 716:S2CID 397:. In 1310:NCBI 1284:GBIF 1276:4XZQ 1191:ISSN 1145:PMID 1051:PMID 1043:ISSN 979:PMID 925:PMID 917:ISSN 858:PMID 798:PMID 790:ISSN 708:ISSN 1271:CoL 1258:AFD 1183:doi 1137:doi 1125:105 1090:hdl 1082:doi 1035:doi 971:doi 909:doi 850:doi 782:doi 750:105 700:doi 537:in 307:of 177:to 171:sp. 1347:: 1325:: 1312:: 1299:: 1286:: 1273:: 1260:: 1245:: 1230:: 1189:. 1177:. 1165:^ 1151:. 1143:. 1135:. 1123:. 1098:. 1088:. 1078:39 1076:. 1072:. 1049:. 1041:. 1031:36 1029:. 1025:. 991:^ 977:. 967:61 965:. 961:. 945:^ 931:. 923:. 915:. 905:67 903:. 897:. 878:^ 864:. 856:. 846:65 844:. 838:. 818:^ 804:. 796:. 788:. 778:58 776:. 770:. 758:^ 748:. 728:^ 714:. 706:. 696:42 694:. 688:. 602:^ 590:. 478:. 288:, 284:, 1197:. 1185:: 1159:. 1139:: 1131:: 1106:. 1092:: 1084:: 1057:. 1037:: 985:. 973:: 939:. 911:: 872:. 852:: 812:. 784:: 722:. 702::

Index

Scientific classification
Edit this classification
Eukaryota
Metamonada
Spirotrichonymphida
Holomastigotoididae
Holomastigotoides
parabasalids
termites
flagella
mitotic spindle
Coptotermes
H. aureus
H. batututi
H. bigfooti
H. hartmanni
H. minor
H. mirabile
H. oxyrhynchus
Heterotermes
Prorhinotermes
Psammotermes
Anacanthotermes
speciation
phagocytosis
Centrin
cell division
mitochondria
Kinetochores
prophase

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