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Topic: Cyclomedusa

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In the News (Sun 21 Apr 19)

  Cyclomedusa - Wikipedia, the free encyclopedia
Cyclomedusa is an ancient circular fossil with a circular bump in the middle and having as many as 5 circular growth ridges around it.
Cyclomedusa was originally thought to be a jellyfish, but some specimens seem to be distorted to accommodate adjacent specimens on the substrate, probably indicating a benthic (bottom-dwelling) creature.
Cyclomedusa is known from Neoproterozoic beds in Ediacara (Australia), Finnmark(Norway), Charnwood Forest (England), Olenek (Russia), North China, Newfoundland, Northwest Canada, Podolia (Ukraine), The Ural Mountains (Russia), the White Sea (Russia), and Sonora (Mexico).
en.wikipedia.org /wiki/Cyclomedusa   (299 words)

Cyclomedusa is the most common element in the Ediacaran fauna, and was originally considered to be a fossil medusa or jellyfish.
However, there were great difficulties in explaining how so many jellyfish managed to get covered by sand when they normally live in the water column and not on the bottom.
Just to show that they are, in fact, holdfasts, this specimen has the stem still attached.
members.tripod.com /~Cambrian/Cyclomedusa   (267 words)

 Cyclomedusa from the White Sea Region of Russia   (Site not responding. Last check: 2007-10-30)
Cyclomedusa from the White Sea Region of Russia
Cyclomedusa is probably the most common and widespread Vendian fossil.
Formerly thought to represent a planktonic (floating) jellyfish of some sort, Cyclomedusa is now considered by some to have been a benthic (bottom-dwelling) polyp, somewhat like a sea anemone.
www.ucmp.berkeley.edu /vendian/cyclomedusa.html   (101 words)

Being originally assigned to fossilized jellyfishes, the Ediacaran discoidal fossils have subsequently been re-interpreted as moulds of unidentified benthic organisms and holdfasts of frondose objects.
However, morphology and preservation of some of the discoidal structures, including Ediacaria and Cyclomedusa, allows their alternative interpretation as being impressions of bacterial and fungal colonies.
Apart from similar discoidal shape, such interpretation is also supported by a common array of observed organizational patterns (concentric rings, radial structures, central dome or crater), which in microbial colonies are produced under conditions of nutrient deprivation.
gsa.confex.com /gsa/2001AM/finalprogram/abstract_21602.htm   (332 words)

 Disk-form Fossils of Canada   (Site not responding. Last check: 2007-10-30)
It is the largest ediacaran disk-fossil that has been found in Canada to date.
These three Cyclomedusa fossils show convincing evidence that the disk-form fossils from Canada represent either cup-shaped animals or bulb-shaped "frond holdfasts" that lived on the bottom of the sea.
It can be seen that where the three come together, there is a flattened "triple-junction" of mutual growth-interference.
geol.queensu.ca /museum/exhibits/ediac/disks.html   (169 words)

He hypothesized that the Ediacaran Fauna were actually the predecessors of future fauna.
Disk shapes such as this Cyclomedusa, one of the most common and wide spread Ediacaran fossil, were thought to be a Jelly fish (image thanks to www.surving.com).
Frond shaped fossils such as this Pteridinium were thought to be ancestors of the sea pens, a relative of sea anemones (image thanks to www.shef.ac.uk).
www.earth.rochester.edu /ees207/Goldberg/sgoldberg2.html   (668 words)

 Arkarua   (Site not responding. Last check: 2007-10-30)
The name "Arkarua" comes from a mythical giant snake of the Aboriginal peoples who live where the fossil was discovered — the Flinders Ranges of south Australia, near Adelaide.
Arkarua occurs alongside Dickinsonia, Tribrachidium, Cyclomedusa, and other familiar Ediacaran animals as well as many new and as yet undescribed species.
The image of Arkarua shown above was taken from the holotype specimen.
www.ucmp.berkeley.edu /vendian/arkarua.html   (265 words)

 A Time & A Place for Gene Transfer
The oldest multicellular animal fossils were a weird and wonderful collection, first discovered in the Ediacara Hills of the Flinders Mountains in south Australia (slide 5).
Dickinsonia, like a corrugated pita loaf, Spriggina, with crescent-shaped head and a segmented body, Cyclomedusa, now thought to be the stalk of a sedentary jelly-fish, Tribrachidium, with three loopy arms, and Parvancorina, a heart-shaped beast with a gut that branches into two.
The fossils date to 600 million years before present, in the late preCambrian era, and animals like these are thought to have originated a billion years ago.
www.indsp.org /MaeWanHo.php   (2602 words)

 Precambrian HSU NHM
The museum has a number of representative fossil casts of White Sea specimens courtesy of M. Fedonkin (Paleontological Institute, Moscow) and the University of California Museum of Paleontology:
Cyclomedusa represents one of the earliest forms of medusa.
It was a sedentary form, which may have evolved by a flattening of a polyp resulting in a concentric body plan.
www.humboldt.edu /~natmus/lifeThroughTime/PreCam.web   (3087 words)

 Ediacaran Fossils of Canada   (Site not responding. Last check: 2007-10-30)
The Mackenzie Mountains, NWT, has the thickest continuous section of rock (2.5 kilometres) containing Ediacaran fossils in the world.
In addition to the myriad of disk-form fossils (like Ediacaria and Cyclomedusa), recent discoveries in Canadian rocks include the tentacled sea anemone-like creature Hiemalora, the segmented-form Windermeria, and the frond-like "spindles" of The Mistaken Point Fossil Assemblage of Newfoundland.
Cutting-edge research on Precambrian life is being done in Canada, notably at Queen's University and the University of Montreal.
geol.queensu.ca /museum/exhibits/ediac/ediac.html   (491 words)

 Jim Force, Ph.D. - Dissertation, Chapter 3
At one of the Precambrian exhibits showing an Australian Cyclomedusa, Martin explained to Jerry, Sam, and me how this creature attached itself to the substrate and formed as a fossil.
He pointed out that the Cyclomedusa on display was positioned upside down.
He attributed this to one author who made this error, which was in turn copied not only here but elsewhere.
www.jimforce.ca /dissertation_3.html   (14427 words)

 A Fungal Analog for Newfoundland Ediacaran Fossils? -- Peterson et al. 43 (1): 127 -- Integrative and Comparative ...
Arrows are pointing at much smaller specimens of Aspidella growing on top of the larger specimen suggesting that at least some Aspidella specimens are the result of sexual propagation from the water column.
B, Cyclomedusa on bed sole from the Rawnsley Quartzite, South Australia.
Note stretching of discoidal holdfast by stalk at upper left, and the three-dimensional preservation of the stalk, which is preserved on at least two layers
icb.oxfordjournals.org /cgi/content/full/43/1/127   (5738 words)

 sciforums.com - The first question, and all other questions
In order to formulate a question, one must have some pre-existing knowledge of the environment.
The first question was asked by a Cyclomedusa 550 million years ago.
The question had something to do with food.
www.sciforums.com /showthread.php?p=558650   (2312 words)

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