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Alienum is an extinct genus of animal of uncertain affinity from the late Ediacaran. Estimated to be about 541 million years old, the type species, Alienum velamenus demonstrates some anatomical characters reminiscent of vetulicolians, while predating the first undisputed member of this clade by 20 million years. It was described in 2024 based on a specimen from the Dengying Formation of South China.
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