Sponges are believed by many researchers to be the earliest living animal group, but there is conflicting evidence for the timing of their origin. A molecular fossil discovery supports the contention that sponges appeared very early, but starkly contradicts the body fossil record.
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Botting, J.P., Nettersheim, B.J. Searching for sponge origins. Nat Ecol Evol 2, 1685–1686 (2018). https://doi.org/10.1038/s41559-018-0702-4
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DOI: https://doi.org/10.1038/s41559-018-0702-4
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