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New genetic analysis forces re-draw of insect family tree

The family tree covering almost half the animal species on the planet has been re-drawn following a genetic analysis which has revealed new relationships between four major groups of insects.

Scientists have found that flies and moths are most closely related to beetles and more distantly related to bees and wasps, contrary to previous theory.

The findings are published in the special Honey Bee Genome issue of the journal Genome Research which coincides with Nature's publication of the honey bee genome sequence (also Thursday 26 October 2006).

The results are based on an analysis of the same 185 genes found in the genomes of eight different insect families, which together represent 45 per cent of all known animal species.

This enabled the international group of scientists to work out the evolutionary relationships between the insects based on changes and mutations within those genes.

Previously scientists had assumed that flies and moths were most closely related to bees and wasps, with beetles more distantly related to these groups.

This new family arrangement also brings the different species of social insects, such as termites and bees, closer together - suggesting that the ability of insects to cooperate in social groupings may have evolved just once, rather than independently in several different species.

"About half of all animal species belong to just four groups of insects but, surprisingly, we never knew for sure how they are related to each other," said Dr Martin Lercher from the University of Bath, who lead the research.

"While there was never unequivocal evidence for it, scientists believed for a long time that, based on morphology, flies and moths were most closely related to bees, with beetles more distantly related to these three groups.

"By comparing genetic information from 185 genes that were sequenced in species from all of these groups, we found
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Source:University of Bath


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