Temporal range: 558–555 mya
Dickinsonia species 2.png
Scientific classification

Dickinsonia is an early type of pre-Cambrian life. They were very different from current organisms. They are considered to be one of the early forms of multicellular organisms. Their bodies were shaped like discs. Based on the fossils, they were between four millimeteers an 1.4m in size.[1] They were only a few millimetres thick. Their body was segmented: there is a large central furrow, and smaller ones around the body of the organism. Their body was symmetric. Mostly based on the shape and size of the fossils found, they have been classified into different species.

The Dickinsonia species probably did not move around the ocean on their own: they used ocean currents to float around. Possibly they had a way to attach to the ocean floor. Their feeding probably resembled that of the placozoa.[2]

Problems with classification

They were also compared to modern-day Cnidarians, Polychaetes, and Turbellaria. Because of the prominent central part, they were also seen as Chordates. Because of their feeding habit, they were classified as similar ot the Placozoa.[2] It was suggested, that they lived in symbiosis with organisms doing photosynthesis, and were possibly comparable to modern-day Lichen; if the mechanism worked the same as in modern-day lichens, they would be fungi.[3]

Dickinsonia are animals

A study published in 2018, has shown Dickinsonia were animals.[4]

"The fossils contained almost exclusively cholesteroids, a marker found only in animals... Thus, Dickinsonia were basal animals. This supports the idea that the Ediacaran biota may have been a precursor to the explosion of animal forms later seen in the Cambrian, about 500 million years ago".[4]

Very little cholesterol was found outside the specimen in the surrounding rock. The Ediacara biota (571 million to 541 million years ago) is the first complex organisms in the geological record large enough to be seen without magnification.[5]

Other Languages
العربية: ديكينسونيا
català: Dickinsonia
Cebuano: Dickinsonia
čeština: Dickinsonia
Deutsch: Dickinsonia
Ελληνικά: Ντικινσόνια
English: Dickinsonia
español: Dickinsonia
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italiano: Dickinsonia
Limburgs: Dickinsonia
magyar: Dickinsonia
Nederlands: Dickinsonia
русский: Дикинсонии
svenska: Dickinsonia
українська: Дикінсонія
Tiếng Việt: Dickinsonia
Winaray: Dickinsonia