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Orbisiana
From Wikipedia, the free encyclopedia
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Orbisiana is an Ediacaran benthic organism formed out of series of agglutinated spherical or hemispherical chambers. It is believed to be a close relative of Palaeopascichnus.[citation needed]
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Description
Orbisiana occur in aggregates made up of rows arranged in sometimes branching chains.[1] 3-D analysis has shown Orbisiana to be cylindrical in shape and open at both the top and bottom ends of its structure.[2] The chains often varied in shape from straight to curved and disorganized lines of spheres with no fixed number of spheres per chain.[2] Specimens range in size but generally have diameters of 0.2–0.9 millimetres (0.0079–0.0354 in).[3] The cell membranes of the organism are often pyritized.[4] The individual chambers are agglutinating.[5]
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Diversity
Two species have been documented, O. linearis and O. simplex.[2][3][4][6][7]
It fits into the Palaeopascichnids, the other genus being Palaeopascichnus itself.[8]
Distribution
Over 100 specimens have been collected from the lower Ediacaran Lantian Formation located in Xiuning and Yixian counties of the Anhui Province, China.[2][7]
Discovery
Orbisiana was first described by B.S. Sokolov in 1976, found in the Neoproterozoic of Russia.[3][6]
Ecology
Orbisiana likely favored calm and well aerated shallow marine habitats in which it could utilize sunlight for benthic photosynthesis.[6]
See also
References
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