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. 2014 Dec 1;24(23):R1131-3.
doi: 10.1016/j.cub.2014.10.059. Epub 2014 Dec 1.

Animal evolution: stiff or squishy notochord origins?

Andreas Hejnol  1 , Christopher J Lowe  2
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Animal evolution: stiff or squishy notochord origins?

Andreas Hejnol et al. Curr Biol. .
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Abstract

The notochord is considered an evolutionary novelty and one of the defining characters of chordates. A new study of an annelid challenges this view and proposes an earlier evolutionary origin in the most recent common ancestor of chordates and annelids.

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