110:
498:
boundary (COBWG). The authors of the study recommended a reevaluation of the Green Point GSSP section, as well as possible redefinitions of the associated horizons using other
313:. It can be readily distinguished from other conodonts existing during the same age by the sideward orientation of the major teeth-like projections (denticulate processes).
486:
575:
416:
516:
511:
731:
448:
638:
476:
and related denticulate groups still require extensive taxonomic clarification. In 2011, a study discovered that the FAD of
741:
736:
109:
541:
303:
had ramiform (branching) array of elements (apparatus). It is believed that the ramiform apparatus in
597:
Robert S. Nicoll; James F. Miller; Godfrey S. Nowlan; John E. Repetski; Raymond L. Ethington (1999).
351:
Robert S. Nicoll, James F. Miller, Godfrey S. Nowlan, John E. Repetski, and
Raymond L. Ethington.
726:
596:
440:
404:
309:
217:
665:
560:
8:
598:
690:
Fredrik
Terfelt; Gabriella Bagnoli; Svend Stouge (2011). "Re-evaluation of the conodont
104:
707:
459:
276:
703:
618:
556:
466:
408:
334:
539:
348:
341:
337:
288:
253:
180:
480:
in the GSSP section in Green Point may not actually be the earliest species of
344:
167:
720:
455:
400:
329:
272:
264:
193:
63:
689:
484:
to appear as was earlier believed. Its true FAD lies above another species,
499:
284:
452:
368:
269:
38:
32:
623:
542:"Global Stratotype Section and Point for base of the Ordovician System"
495:
463:
420:
396:
280:
83:
48:
121:
88:
491:
388:
384:
256:
154:
141:
78:
73:
58:
53:
43:
249:
93:
68:
576:"Hierarchical Classification of the Superclass Conodontomorphi"
412:
376:
360:
131:
694:
and implications for the base of the
Ordovician System GSSP".
540:
Roger A. Cooper; Godfrey S. Nowlan; S. Henry
Williams (2001).
428:
424:
392:
380:
325:
260:
666:"The Subcomission on Cambrian Stratigraphy: the Status Quo"
372:
663:
236:
Nicoll, Miller, Nowlan, Repetski & Ethington, 1999
603:Nicoll, Miller, Nowlan, Repetski and Ethington and
307:evolved from the coniform (cone-like) apparatus of
718:
347:(Cavidonti). It was first described in 1999 by
599:"Designation of holotypes for new species of
573:
622:
517:Great Ordovician Biodiversification Event
535:
533:
531:
657:
451:, Canada is defined as the base of the
719:
683:
449:Green Point, Newfoundland and Labrador
664:John H. Shergold; Gerd Geyer (2003).
590:
528:
512:Cambrian–Ordovician extinction event
567:
13:
631:
574:Jack R. Holt (December 24, 2009).
434:
14:
753:
299:Like other members of the genus,
708:10.1111/j.1502-3931.2011.00275.x
108:
36:
561:10.18814/epiiugs/2001/v24i1/005
354:
333:. It belongs to the cordylodan
294:
1:
732:Fossil taxa described in 1999
611:Journal of Micropalaeontology
522:
367:have been described from the
490:, and is not present at the
462:) and the beginning of the
7:
505:
316:
10:
758:
487:Iapetognathus preaengensis
478:Iapetognathus fluctivagus
445:Iapetognathus fluctivagus
365:Iapetognathus fluctivagus
322:Iapetognathus fluctivagus
305:Iapetognathus fluctivagus
301:Iapetognathus fluctivagus
245:Iapetognathus fluctivagus
230:Iapetognathus fluctivagus
223:
216:
105:Scientific classification
103:
25:Iapetognathus fluctivagus
23:
742:Early Ordovician animals
578:. Susquehanna University
324:is classified under the
268:. It existed during the
645:. Paleobiology Database
16:Species of jawless fish
441:first appearance datum
310:Iapetonudus ibexensis
283:. It is an important
737:Ordovician conodonts
624:10.1144/jm.18.2.124
472:However, the genus
209:I. fluctivagus
460:million years ago
447:in the cliffs of
277:million years ago
259:belonging to the
241:
240:
749:
712:
711:
687:
681:
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661:
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409:British Columbia
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113:
112:
98:
35:
29:Temporal range:
21:
20:
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435:Biostratigraphy
357:
349:paleontologists
338:Cordylodontidae
319:
297:
289:biostratigraphy
252:of denticulate
237:
234:
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190:
181:Cordylodontidae
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61:
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31:
30:
27:
17:
12:
11:
5:
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745:
744:
739:
734:
729:
727:Proconodontida
714:
713:
702:(2): 227–237.
682:
673:Geologica Acta
656:
630:
589:
566:
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521:
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345:Proconodontida
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168:Proconodontida
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149:
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28:
15:
9:
6:
4:
3:
2:
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738:
735:
733:
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728:
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724:
722:
709:
705:
701:
697:
693:
692:Iapetognathus
686:
678:
674:
667:
660:
644:
642:
641:Iapetognathus
634:
625:
620:
616:
612:
608:
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605:Iapetognathus
602:
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577:
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562:
558:
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527:
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510:
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500:index fossils
497:
493:
489:
488:
483:
482:Iapetognathus
479:
475:
474:Iapetognathus
470:
468:
465:
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454:
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432:
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401:United States
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382:
378:
374:
370:
366:
362:
352:
350:
346:
343:
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336:
332:
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330:Iapetognathus
327:
323:
314:
312:
311:
306:
302:
292:
290:
286:
282:
278:
274:
271:
267:
266:
265:Iapetognathus
262:
258:
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247:
246:
233:
231:
222:
219:
218:Binomial name
215:
211:
210:
204:
201:
200:
197:
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195:Iapetognathus
189:
186:
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182:
176:
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55:
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45:
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34:
26:
22:
19:
699:
695:
691:
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672:
659:
649:November 30,
647:. Retrieved
640:
633:
617:(124): 124.
614:
610:
604:
600:
592:
582:November 30,
580:. Retrieved
569:
555:(1): 19–28.
552:
548:
485:
481:
477:
473:
471:
444:
438:
427:province of
405:Newfoundland
364:
358:
355:Distribution
328:
321:
320:
308:
304:
300:
298:
285:index fossil
263:
244:
243:
242:
229:
224:
208:
207:
194:
24:
18:
601:Iapetonudus
453:Tremadocian
403:; western
369:Tremadocian
295:Description
270:Tremadocian
33:Tremadocian
721:Categories
523:References
496:Ordovician
464:Ordovician
423:; and the
421:Kazakhstan
397:New Mexico
281:Ordovician
254:cordylodan
679:(1): 5–9.
443:(FAD) of
417:Bartyrbay
279:) of the
257:conodonts
202:Species:
155:Conodonta
128:Kingdom:
122:Eukaryota
607:Landing"
549:Episodes
506:See also
492:Cambrian
389:Oklahoma
385:Colorado
317:Taxonomy
174:Family:
142:Chordata
138:Phylum:
132:Animalia
118:Domain:
696:Lethaia
458:(485.4
399:of the
361:fossils
340:of the
275:(485.4
250:species
227:†
206:†
187:Genus:
161:Order:
148:Class:
467:Period
413:Canada
395:, and
377:Nevada
335:family
669:(PDF)
545:(PDF)
429:China
425:Hebei
393:Texas
381:Idaho
342:order
326:genus
261:genus
248:is a
651:2012
584:2012
439:The
407:and
373:Utah
359:The
39:PreꞒ
704:doi
619:doi
557:doi
456:Age
419:of
411:of
371:of
363:of
287:in
273:Age
723::
700:45
698:.
675:.
671:.
615:18
613:.
609:.
553:24
551:.
547:.
530:^
502:.
469:.
431:.
415:;
391:,
387:,
383:,
379:,
375:,
291:.
89:Pg
710:.
706::
677:1
653:.
643:"
639:"
627:.
621::
586:.
563:.
559::
494:–
191:†
178:†
165:†
152:†
94:N
84:K
79:J
74:T
69:P
64:C
59:D
54:S
49:O
44:Ꞓ
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