Dickinsonia

Dickinsonia is a genus in the family Dickinsoniidae. It comprises bilaterally symmetric ovoids, with multiple isomers. These isomers are filled with fluid at a higher pressure than the surrounding water, somewhat like an airbed.

Preserved Dickinsonia fossils are found in the White Sea and Edicaran assemblage.

Species
The following species are part of the Dickinsonia genus :
 * Dickinsonia costata
 * Dickinsonia tenuis
 * Dickinsonia lissa
 * Dickinsonia menneri
 * Dickinsonia rex

Mode of Life
Members of Dickinsonia live on the seafloor, unattached but also not moving. They feed by absorbing nutrients from the seawater.

Time Period
Members of Dickinsonia lived between 558 and 555 million years ago, in the Ediacaran 3 Age of the Ediacaran Period.