Evolution of a penis worm

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Cleavage-stage embryos from the Lower Cambrian Southern China comparing biological detail with non-biological (diagenetic) artefacts.
Cleavage-stage embryos from the Lower Cambrian, Southern China, comparing biological detail with non-biological (diagenetic) artefacts.

The detailed images of embryos more than 500 million years old have been revealed by an international team of scientists, led by the University of Bristol. Writing in the journal Nature, Dr Phil Donoghue and colleagues reveal the various developmental stages of fossilised embryos, from the first splitting of cells to pre-hatching, using synchrotron-radiation X-ray tomographic microscopy (SRXTM).


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