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410:. The fossil measures 56×37 mm in diameter. It indicates it is a soft-bodied animal having an appearance of a smooth discoidal structure connected by a relatively short stem to a quadrate body comprising numerous and regularly aligned linear fibres. The fibres, which are similar in pattern to parallelly arranged
405:
is uniquely different from any other
Ediacaran fossil so far discovered in that it consists of bundles of fibres that have been identified as muscles. The entire body is in a broadly four-fold symmetrical arrangement. Thus the overall body organisation conforms to the key features of modern
288:
in 2014. It is the first
Ediacaran organism discovered to show fossils of muscle fibres. Structural examination of the muscles and morphology indicate that the animal is a cnidarian, though, which
414:, extend laterally across the body, linking adjacent corners. The fibres extend beyond each corner to form an elongate branch, which is divided into smaller
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558:"The Palaeobiology of Two Crown Group Cnidarians: Haootia quadriformis and Mamsetia manunis gen. et sp. nov. from the Ediacaran of Newfoundland, Canada"
771:
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McIlroy, D.; Pasinetti, G.; Pérez-Pinedo, D.; McKean, C.; Dufour, S. C.; Matthews, J. J.; Menon, L. R.; Nicholls, R.; Taylor, R. S. (September 2024).
687:
348:
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343:, remains on the north shore of Back Cove, roughly 1.8 km NNW of Melrose town. A second, incomplete specimen was also discovered in the
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509:"Haootia quadriformis n. gen., n. sp., interpreted as a muscular cnidarian impression from the Late Ediacaran period (approx. 560 Ma)"
674:
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418:. Smaller branches also arise from the lateral margins of the quadrate body, and also form dichotomously branched fibres.
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in 2008. However, the specimen was not allowed to be removed according to provincial law in
Newfoundland, so that only a
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451:"Animals first flex their muscles: Earliest fossil evidence for animals with muscles"
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Liu, A. G.; Matthews, J. J.; Menon, L. R.; McIlroy, D.; Brasier, M. D. (2014).
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A Latin dictionary founded on
Andrews' edition of Freund's Latin dictionary.
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of the body. The proper word in classical Latin for "fourfold" is actually
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was made. The cast (plastotype) is maintained in the collections of the
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560-Million-Year-Old Fossil
Provides Earliest Evidence of Muscles
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belongs to was undetermined until a 2024 study found it to be a
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Newfoundland fossil is earliest evidence of muscled animals
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Proceedings of the Royal
Society B: Biological Sciences
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394:is the proper word in classical Latin for "form".
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323:in Newfoundland. It was originally unearthed by
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280:tissue in an animal. Discovered in 2008 from
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632:Newfoundland fossil is oldest with muscles
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772:Paleontology in Newfoundland and Labrador
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483:. University Of Cambridge. 27 August 2014
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599:Lewis, C.T. & Short, C. (1879).
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477:"Animals first flex their muscles"
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762:Enigmatic prehistoric animal taxa
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374:is said to be derived from Latin
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767:Fossil taxa described in 2014
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742:Prehistoric cnidarian genera
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284:in eastern Canada, it was
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131:Scientific classification
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603:Oxford: Clarendon Press.
428:List of Ediacaran genera
125:Artist's reconstruction
351:, Bonavista Peninsula.
525:10.1098/rspb.2014.1202
384:quadrilateral symmetry
714:Paleobiology Database
575:10.3390/life14091096
416:dichotomous branches
403:Haootia quadriformis
358:is derived from the
329:University of Oxford
307:The first fossil of
254:Haootia quadriformis
235:Haootia quadriformis
214:H. quadriformis
345:Trepassey Formation
321:Bonavista Peninsula
269:is identified as a
519:(1793): 20141202.
313:Fermeuse Formation
303:Discovery and name
286:formally described
757:Fossils of Canada
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701:Open Tree of Life
643:Taxon identifiers
481:PressReleasePoint
354:The generic name
325:Martin D. Brasier
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568:(9): 1096.
398:Description
366:, meaning "
349:Burnt Point
736:Categories
434:References
408:cnidarians
388:quadruplex
297:staurozoan
666:Q18164962
584:2075-1729
487:31 August
461:31 August
317:Back Cove
271:cnidarian
207:Species:
178:Staurozoa
154:Kingdom:
148:Eukaryota
36:560
660:Wikidata
543:25165764
422:See also
390:, while
341:holotype
168:Cnidaria
164:Phylum:
158:Animalia
144:Domain:
706:6372046
693:1481611
680:8629357
651:Haootia
534:4173675
360:Beothuk
356:Haootia
327:of the
309:Haootia
232:†
211:†
192:Haootia
184:Genus:
174:Class:
105:↓
25:Haootia
719:304123
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380:formis
376:quadri
278:muscle
257:is an
245:, 2014
243:et al.
201:, 2014
199:et al.
688:IRMNG
392:forma
368:demon
364:Haoot
362:word
290:class
274:polyp
675:GBIF
580:ISSN
562:Life
539:PMID
489:2014
463:2014
241:Liu
197:Liu
44:PreꞒ
570:doi
529:PMC
521:doi
517:281
347:of
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38:Ma
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188:†
99:N
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79:T
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69:C
64:D
59:S
54:O
49:Ꞓ
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