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Marine worms a bit like you and me
William Atkins
Saturday, 12 February 2011 01:17
Page 1 of 2
Research into two groups of marine worms has found that they have 'evolved backwards' and that they evolved from the same ancestors as humans.
Xenotrubella, which contains the two species Xenoturbella bocki and Xenoturbella westbladi, does not have a brain nor an excretory system or gut. The researchers found some of them in the mud of a fjord in Sweden
The genus Acoelomorpha is found in marine waters swimming and crawling around algae and various sediment grains. The researchers found one species living inside the throat of a sea cucumber.
The research by this international team of scientists is found in the journal Nature under the title 'Acoelomorph flatworms are deuterostomes related to Xenoturbella' (volume 470, pages 255-258, doi: 10.1038/nature09676).
According to the ScienceDaily.com story Simple Marine Worms Distantly Related to Humans, 'Two groups of lowly marine worms are related to complex species including vertebrates (such as humans) and starfish'¦.'
And, 'Previously thought to be an evolutionary link between simple animals such as jellyfish and the rest of animal life -- the worms' surprising promotion implies that they have not always been as simple as they now appear.'
Page two concludes.
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