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The Ediacaran (/ ˌ iː d i ˈ æ k ər ə n /; formerly Vendian) biota is a taxonomic period classification that consists of all life forms that were present on Earth during the Ediacaran Period (c. 635–538.8 Mya). These were enigmatic tubular and frond-shaped, mostly sessile, organisms.
The fossil record from the Ediacaran Period is sparse, as more easily fossilized hard-shelled animals had yet to evolve. The Ediacaran biota include the oldest definite multicellular organisms (with specialized tissues), the most common types of which resemble segmented worms, fronds, disks, or immobile bags. Auroralumina was a cnidarian. [33] [34]
This is a list of all described Ediacaran genera, including the Ediacaran biota. It contains 247 genera. Valid genus; Junior synonym; Vague status; Rejected as valid ...
The Nama assemblage was the last of the Ediacaran biotic assemblages. Following the Avalon and White Sea assemblages, it spanned from c. 550 Ma to c. 539 Ma, coinciding with the Terminal Ediacaran biozone. [3] The assemblage was characterized by a faunal turnover, with the decline of the preexisting White Sea biota.
The last Ediacaran association is that of Nama (550–541 Ma, Namibia), where a decrease in biodiversity is observed, as a preamble to the massive extinction of the Ediacaran biota. Before the end of the Ediacaran period, proarticulates and trilobozoans would have already become extinct; and the last vendobionts disappear with the arrival of ...
The holotype fossil of Vendoconularia was found from the Ust’-Pinega Formation, in the White Sea of Russia in 1997, and formally described in 2002. [1]The generic name Vendoconularia derives from Vendian, the Russian name for the Ediacaran; and the genus name conularia, due to its similar appearance to Conulariids.
Dickinsonia is a genus of extinct organism, most likely an animal, that lived during the late Ediacaran period in what is now Australia, China, Russia, and Ukraine. It is one of the best known members of the Ediacaran biota. The individual Dickinsonia typically resembles a bilaterally symmetrical ribbed oval.
Ernietta is an extinct genus of Ediacaran organisms with an infaunal lifestyle. [2] Fossil preservations and modeling indicate this organism was sessile and “sack”-shaped. It survived partly buried in substrate, with an upturned bell-shaped frill exposed above the sediment-water interface. [ 3 ]