EVOLUTION OF THE PENIS WORM

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EVOLUTION OF THE PENIS WORM
22 March 2007 - University of Bristol

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.

In one instance this has exposed the internal anatomy of the mouth and anus of a close relative of the living penis worm. Another case has revealed a unique pattern for making embryonic worm segments, not seen in any animals living today.

Phil Donoghue, from the University of Bristol, said: “Because of their tiny size and precarious preservation, embryos are the rarest of all fossils. They are just gelatinous balls of cells that rot away within hours. But these fossils are the most precious of all because they contain information about the evolutionary changes that have occurred in embryos over the past 500 million years.”

This work has enabled the reinterpretation of previous data on fossilised arthropod embryos, showing that they are similar to those found in modern arthropods (insects and crustaceans). This suggests that arthropod evolutionary history must be pushed further back in time than previously thought.

Using SRXTM at the Swiss Light Source of the Paul Scherrer Institute in Switzerland, the team obtained complete three-dimensional images of the fossilised embryos at sub-micrometre resolution. The scans from these experiments are then manipulated in a computer to reconstruct the internal anatomy of the fossil embryos, unlocking the finest details of their preserved anatomy and revealing their hidden secrets.

The present study demonstrates the feasibility of the method for a variety of questions concerning developmental processes in early fossil animals.

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The University College of Bristol opened in 1876, after six years of discussions and controversy, in a bid to bring university culture to the provinces. It was the first college in the country to admit men and women on an equal footing.

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2003 saw the completion of the Dorothy Hodgkin building, named after the University’s fifth Chancellor. The £18 million building is dedicated to research in neuroendocrinology. 2003 also saw the opening of the University’s £5 million Centre for Sport, Exercise and Health.

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