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fossils are remarkably well conserved within the
Burgess Shale, despite jellyfish being approximately 95% water. The Royal Ontario Museum has publicized the identification of the Burgessomedusa phasmiformis as the earliest documented swimming jellyfish in the fossil archive. This breakthrough was
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is likely to have swum using a rowing propulsion, with jet propulsion being unlikely due to a lack of structures restricting the opening. Its association with benthic species suggests that it spent at least some of its time close to the ocean floor. It was likely an active predator based on the
340:, occupy approximately 45% of the height of the umbrella. These gonads are situated at the corners of the umbrella, though internally they are positioned at a midpoint between the edge of the umbrella and the manubrium.
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The genus exhibits a cuboidal bell-shaped umbrella, where the width spans around 40% of the umbrella's vertical dimension. More than 90 tentacles resembling fingers are distributed along the edge of the
438:, relies on ancient remains found in the Burgess Shale's Raymond Quarry. Researchers found 182 fossils that were mainly unearthed during the late 1980s and 1990s under the supervision of
570:"Species New to Science: [Paleontology β’ 2023] Burgessomedusa phasmiformis β’ A Macroscopic Free-swimming Medusa (Cnidaria: Medusozoa) from the middle Cambrian Burgess Shale"
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396:), making it the oldest known free-living medusa stage known. Other supposed free-living medusa fossils from the Cambrian, such as those from the
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extends to a length equivalent to up to two-thirds of the umbrella's size. The reproductive structures, elongated and egg-shaped
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shape of the umbrella. The authors stated that the species name was an oblique reference to the ghosts in the video game
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and reached a length of 20 cm. It is considered as the oldest unambiguous free-swimming medusa (commonly known as
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showcased in the
Burgess Shale division of the Willner Madge Gallery, Dawn of Life since its inauguration in 2021.
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cavity is positioned at the highest point of the umbrella, taking up roughly 30% of the total body area.
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644:"Paleontologists Identify Oldest Known Species of Free-Swimming Jellyfish | Sci.News"
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ROM visitors have the opportunity to observe some of the fossils belonging to
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506:"A macroscopic free-swimming medusa from the middle Cambrian Burgess Shale"
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595:"Oldest adult jellyfish fossil ever found is over 500 million years old"
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284:" pertains to the geographical area Burgess Shale, and the Latin word
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Moon, Justin; Caron, Jean-Bernard; Moysiuk, Joseph (2023-08-09).
264:), if potential older records from other fossil sites represent
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Proceedings of the Royal
Society B: Biological Sciences
325:, extending to about 15% of the umbrella's height. The
619:"A 505-million-year-old jellyfish has been discovered"
442:, the former Curator of Invertebrate Palaeontology in
410:of China are considered doubtful, and possibly
352:similar shape of its bell with that of living
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669:"Burgessomedusa phasmiformis - GKToday"
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296:is from the combination of the Greek "
453:officially documented in the journal
248:. The genus was characterized by the
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455:Proceedings of the Royal Society B
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434:This research, which identifies
648:Sci.News: Breaking Science News
474:Paleobiota of the Burgess Shale
288:relates to the taxonomic group
252:-like body with about 90 short
194:Moon, Caron & Moysiuk, 2023
174:Moon, Caron & Moysiuk, 2023
430:, where the fossils were found
380:of box jellyfish (Cubozoa) or
332:The central part known as the
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709:Fossil taxa described in 2023
368:relationships indicates that
719:Prehistoric cnidarian genera
724:Fossils of British Columbia
462:Burgessomedusa phasmiformis
245:Burgessomedusa phasmiformis
189:Burgessomedusa phasmiformis
112:Burgessomedusa phasmiformis
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704:Cambrian genus extinctions
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120:Scientific classification
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16:Genus of animals (fossil)
714:Cambrian invertebrates
574:Species New to Science
522:10.1098/rspb.2022.2490
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426:Raymond Quarry in the
699:Burgess Shale fossils
568:Pskhun (2023-08-04).
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444:Royal Ontario Museum
114:specimen ROMIP65784
258:predatory lifestyle
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300:" and the Latin "
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360:Classification
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403:Yunannoascus
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294:phasmiformis
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181:Type species
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412:ctenophores
372:belongs to
323:oral cavity
276:Genus is a
266:ctenophores
219:macroscopic
150:Subphylum:
693:Categories
678:2023-08-10
654:2023-08-10
629:2023-08-09
604:2023-08-10
593:Ly, Chen.
579:2023-08-10
480:References
388:including
378:stem group
316:Morphology
225:cnidarians
729:Medusozoa
530:0962-8452
418:Discovery
414:instead.
406:from the
394:Scyphozoa
390:Staurozoa
382:Acraspeda
374:Medusozoa
334:manubrium
290:Medusozoa
272:Etymology
268:instead.
262:jellyfish
254:tentacles
212:monotypic
155:Medusozoa
126:Kingdom:
548:37528711
539:10394413
516:(2004).
468:See also
278:compound
229:Cambrian
143:Cnidaria
138:Phylum:
131:Animalia
344:Ecology
327:stomach
310:Pac-Man
306:ghostly
282:Burgess
208:extinct
162:Genus:
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338:gonads
298:phasma
286:medusa
238:. The
236:Canada
206:is an
386:taxon
302:forma
215:genus
544:PMID
526:ISSN
250:bell
37:Preκ
534:PMC
518:doi
514:290
384:(a
242:is
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