Gromia sphaerica
Gromia sphaerica | |
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Close-up of Gromia in place. Note the particles of sand and muck stuck to the surface. | |
Scientific classification | |
Domain: | Eukaryota |
Clade: | Diaphoretickes |
Clade: | SAR |
Phylum: | Endomyxa |
Class: | Gromiidea |
Order: | Gromiida |
Family: | Gromiidae |
Genus: | Gromia |
Species: | G. sphaerica
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Binomial name | |
Gromia sphaerica Gooday, Bowser, Bett & Smith 2000
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Gromia sphaerica is a large spherical
seafloor, and it is mostly filled with stercomata (waste pellets).[2]
In 2008, 30-millimeter (1.2-inch) specimens were found off the coast of
single-celled organisms were incapable of making these kinds of trails, and their cause was previously a source of speculation. The mud trails made by the Bahamian Gromia appear to match prehistoric mud trails from the Precambrian, including 1.8 billion year-old fossil trails in the Stirling formation in Australia.[3][4][5][6] Because the tracks of Gromia resemble the 1.8 billion year old traces that were believed to represent the traces of complex bilaterian
worms, said tracks could have been a result of similarly giant single-celled organisms instead of complex animals.
Description
Gromia sphaerica mainly resembled a grape in size and in body appearance. When the sediment was removed from one of the specimens, it showed that the skin was similar to that of a grapes skin, but much softer when touched.[7]
Tracks
The tracks that G. sphaerica makes on the muddy sea floor are similar to the tracks of animals from the Ediacaran period. In some of the photos, the tracks can be seen as being curved.[8]
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Multiple individuals of Gromia sphaerica on the slope of Exuma Valley, together with a shrimp for scale. The shrimp is about 10 cm long and maintains a horizontal position. Inset: details of individual traces.
References
- .
- doi:10.1016/S0967-0645(99)00100-9. Archived from the originalon 2012-05-31. Retrieved 2008-11-20 – via Centre National de la Recherche Scientifique.
- S2CID 8819675. Retrieved 2008-12-05.
- ^ Reilly, Michael (2008-11-20). "Single-celled giant upends early evolution". NBC News. Retrieved 2008-12-05.
- ^ "Discovery of Giant Roaming Deep Sea Protist Provides New Perspective on Animal Evolution". University of Texas at Austin College of Natural Sciences. 2008-11-20. Retrieved 2019-07-21.
- ^ "Rolling 'Sea Grape' Rocks The Fossil Record". ScienceDaily. 2008-12-04. Retrieved 2018-07-24.
- ^ "Sinh vật đơn bào thay đổi cách nhìn về tiến hóa - KhoaHoc.tv".
- ^ "Figure 1. Tracks of the Bahamian Gromia sphaerica (A) Gently sloping".