Disclaimer: Supplementary materials have been peer-reviewed but not copyedited.

ede12002-sup-0001-VideoS1.avi6144KVideo_S1–S3. Time-lapse videos of cleavage until the 64-cell stage in two embryos of Phoronis muelleri.
ede12002-sup-0002-VideoS2.avi3693KVideo_S1. Cleavage in an embryo seen from vegetal with focus on the vegetal pole.

Video_S2. Cleavage of the same embryo as in Video_S1, but from third cleavage onwards the focus of the video is on the four most animal blastomeres.

Video_S3. Cleavage in an embryo seen from animal from the three-cell up to the compacted 64-cell stage.

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