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Aspidella is a disc-shaped fossil sometimes found densely packed in great numbers. It is probably the same as fossils named Cyclomedusa or Ediacaria. Aspidella fossils have been interpreted as mollusks, jellyfish, fungi, and non-biotic sedimentary structures. It is possible that the name has been applied to more than one kind of organism. Some of them are likely organs called holdfasts, that attach an animal to a surface (Tarhan et al., 2015). Others may be fossils of colonies of algae or bacteria (Gerdes et al., 2007). Aspidella has been found in Canada, the United States, Mexico, Argentina, Norway, the United Kingdom, Russia, Kazakhstan, India, Namibia, and Australia. This specimen is from the Precambrian rocks of Russia.

References:

Gerdes, G. and Grazhdankin, D., 2007. Ediacaran microbial colonies, Lethaia, 40(3), pp. 201–210. doi:10.1111/j.1502-3931.2007.00025.x.

Tarhan, L.G. et al., 2015. Taphonomy and morphology of the Ediacara form genus Aspidella, Precambrian Research, 257, pp. 124–136. doi:10.1016/j.precamres.2014.11.026.