585 Million Years Ago";citation_pages=906-906;citation_volume=339;citation_year=2013;citation_issue=6122;citation_issn=0036-8075;citation_pmid=23430638;citation_doi=10.1126/science.1230339" /> 585 Million Years Ago";citation_pages=906-906;citation_volume=339;citation_year=2013;citation_issue=6122;citation_issn=0036-8075;citation_pmid=23430639;citation_doi=10.1126/science.1230677" /> Haootia quadriformis n. gen., n. sp., interpreted as a muscular cnidarian impression from the Late Ediacaran period (approx. 560 Ma) | Proceedings of the Royal Society of London B: Biological Sciences