Species of alga
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Miaohephyton is a carbonaceous compression fossil of a thalloid organism that has been interpreted as a brown alga.
Its Neoproterozoic age ( 550) is incompatible with molecular clocks that estimate the divergence of the brown algae around  million years ago, leading to suggestions that its "brown algal" features are the result of convergence.
The organism grew both by apical growth (leading to bifurcation) and intercalary growth (increasing the distances between nodes). Some specimens are smooth, whereas others bear rounded structures that are interpreted as conceptacles.
References.
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