La --posible- evidencia más antígua de músculos, Haootia quadriformis.1
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1 Liu, Alexander G.; Jack J. Matthews; Latha R. Menon; Duncan McIlroy and Martin D. Brasier. 2014. Haootia quadriformis n. gen., n. sp., interpreted as a muscular cnidarian impression from the Late Ediacaran period (approx. 560 Ma). Procceedings of The Royal Society B: Biological Sciences, 281(1793): 20141202 doi:10.1098/rspb.2014.1202.
