Acoel flatworms: earliest extant bilaterian Metazoans, not members of Platyhelminthes.
Ruiz-Trillo I; Riutort M; Littlewood DT; Herniou EA; Baguña J; Science (New York, N.Y.), 1999, vol. 283, issue 5409, p 1919, ISSN 00368075. ISBN 00368075.

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