135:
117:
439:, which the discoverers attribute to vertical motion of the organism through sediment before its death - noting that due to differing preservation methods it is unlikely that both trace and body fossil could otherwise form simultaneously. However, this does not entirely remove the possibility that the association of
312:
The age of
Ediacara Member strata are not well-defined through radiometric dating, and are primarily estimated comparatively with other Ediacaran Biota assemblages, likely ranging between approximately 562 Ma and 542 Ma. Brazilian trace fossils associated with later bilaterians, found 30-40m above a
296:
605:
343:) in recognition of the local indigenous people who originally lived in the region where the fossils were collected. The specific name refers to Warioota Creek, the type locality.
724:
563:
714:
359:(from 1.9 to 6.7 mm in length), slightly thickening to one end. The "anterior"/"posterior" differentiation may indicate that
471:
fossils are very different from the animals that came to dominate the life on Earth in the
Cambrian and until present day.
719:
455:
This discovery is notable because while it has been long suspected that bilaterians evolved in the
Ediacaran, for example
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and appeared to show sensory and seeking behaviour, turning as it moved. It is thought to have moved by
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occurred and where widespread fossil evidence of modern bilaterian taxa appear in the fossil record.
625:
457:
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129:
681:
384:. The animal that produced such traces moved or burrowed through thin layers of well-oxygenated
539:
617:
606:"Patterns of distribution in the Ediacaran biotas: Facies versus biogeography and evolution"
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519:
271:
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that are estimated to be between 560 and 555 million years old. A representative of the
534:
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291:
698:
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Evans, Scott D.; Hughes, Ian V.; Gehling, James G.; Droser, Mary L. (23 March 2020).
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fossils have been found. These are simple imprints resembling a small grain of
297:
Proceedings of the
National Academy of Sciences of the United States of America
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87:
52:
524:
364:
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182:
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92:
36:
32:
543:
508:"Discovery of the oldest bilaterian from the Ediacaran of South Australia"
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82:
77:
62:
57:
47:
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is an early example of a wormlike, 2β7 mm-long (0.1β0.3 in)
405:
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bed radiometrically dated to 555 Ma, are thought to be younger than
258:
organism. Its fossils are found in rocks of the
Ediacara Member of
385:
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642:
300:
on 23 March 2020, describing the finding and identification of
564:"Fossil hunters find evidence of 555m-year-old human relative"
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10.1666/0094-8373(2004)030<0203:PODITE>2.0.CO;2
587:"Ancestor of all animals identified in Australian fossils"
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identified in the study was found in close proximity to
427:
match predictions for the producer of the trace fossil
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Scott D. Evans, Ian V. Hughes, James G. Gehling, and
651:
334:
512:Proceedings of the National Academy of Sciences
374:On the same sandstone bed there are numerous
8:
400:, constricting muscles against the animal's
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616:(2). Cambridge University Press: 203β221.
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20:
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16:Early bilaterian organism fossil species
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274:, roughly 15 million years before the
604:Grazhdankin, Dima (8 February 2016).
7:
419:description find that the size and
371:anatomy were found on its fossils.
329:The generic name is taken from the
14:
431:. At least one of the fossils of
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562:Davis, Nicola (23 March 2020).
412:, in a similar way to a worm.
365:bilaterally symmetrical animal
1:
725:Fossil taxa described in 2020
715:Ediacaran first appearances
467:, yet the vast majority of
408:, mouth, anus, and through-
404:, and may have possessed a
339:, also the name for nearby
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333:word for "meeting place" (
321:evolved prior to 560 Ma.
294:published a paper in the
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130:Scientific classification
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23:
525:10.1073/pnas.2001045117
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367:. No other details of
317:. It is possible that
677:Paleobiology Database
124:Artist's restoration
720:Fossils of Australia
402:hydrostatic skeleton
445:Helminthoidichnites
437:Helminthoidichnites
429:Helminthoidichnites
415:The authors of the
381:Helminthoidichnites
280:Cambrian explosion
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691:
645:Taxon identifiers
518:(14): 7845β7850.
270:lived during the
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246:
242:Evans et al, 2020
215:I. wariootia
203:
202:Evans et al, 2020
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685:
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653:Ikaria wariootia
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593:. 23 March 2020.
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272:Ediacaran period
251:Ikaria wariootia
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236:Ikaria wariootia
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29:Temporal range:
25:Ikaria wariootia
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469:Ediacaran biota
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264:Ediacaran biota
260:South Australia
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710:Ediacaran life
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292:Mary L. Droser
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392:as it sought
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376:trace fossils
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341:Wilpena Pound
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331:Adnyamathanha
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224:Binomial name
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610:Paleobiology
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568:The Guardian
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451:Significance
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416:
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379:
378:of the type
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302:I. wariootia
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196:
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24:
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705:Bilaterians
398:peristalsis
390:ocean floor
278:, when the
170:ParaHoxozoa
35:, ~560-555
699:Categories
475:References
464:Kimberella
421:morphology
394:sustenance
256:bilaterian
668:Q88471230
630:129376371
351:Over 100
325:Etymology
286:Discovery
208:Species:
183:Bilateria
153:Kingdom:
147:Eukaryota
33:Ediacaran
662:Wikidata
591:Phys.org
544:32205432
347:Features
276:Cambrian
157:Animalia
143:Domain:
535:7149385
458:Temnoxa
388:on the
233:†
212:†
189:Genus:
104:↓
682:412748
628:
542:
532:
441:Ikaria
433:Ikaria
425:Ikaria
417:Ikaria
406:coelom
369:Ikaria
363:was a
361:Ikaria
353:Ikaria
319:Ikaria
315:Ikaria
268:Ikaria
197:Ikaria
626:S2CID
443:with
336:Ikara
177:Clade
164:Clade
540:PMID
461:and
386:sand
357:rice
43:Preκ
618:doi
530:PMC
520:doi
516:117
423:of
410:gut
308:Age
701::
679::
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624:.
614:30
612:.
608:.
589:.
576:^
566:.
552:^
538:.
528:.
514:.
510:.
482:^
304:.
266:,
179::
166::
93:Pg
37:Ma
632:.
620::
570:.
546:.
522::
193:β
98:N
88:K
83:J
78:T
73:P
68:C
63:D
58:S
53:O
48:κ
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