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New genetic analysis forces re-draw of insect family tree

that in fact flies and moths are most closely related to beetles, and more distantly related to bees.

"This sheds new light on a large number of evolutionary questions, as a correct understanding of the evolutionary relationships is fundamental to any interpretation of similarities or differences among species.

"For example, social colonies are common among bees and wasps and their relatives, ants, as well as among more distantly related insects, such as termites and aphids.

"That beetles don't show this tendency, known as eusociality, has been interpreted as a sign that eusociality has evolved several times independently.

"Now that we know that bees, wasps and ants are in fact the closest relatives to the more distantly related (or 'basal') species, it appears more likely that the genetic basis for eusociality may have evolved only once, and was lost in the common ancestor of beetles, moths, and flies."

The researchers used the genomes of six different insects from the holometabolous group of insects (insects which undergo complete metamorphosis): fruit fly (Drosophila melanogaster), mosquito (Anopheles gambiae), silk moth (Bombyx mori), flour beetle (Tribolium castaneum), honey bee (Apis mellifera) and sibling parasitic wasp species (Nasonia vitripennis and Nasonia giraulti).

These insects represent the four major orders of holometabolous insects, beetles (Coleoptera), moths (Lepidoptera), flies (Diptera) and bees and wasps (Hymenoptera), which together represent 45 per cent of the animal species on earth.

They also included one orthopteran (the grasshopper Locusta migratoria) and one hemipteran (the pea aphid Acyrthosiphon pisum), both of which are uncontested out-groups to the holometabolous insects.
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Source:University of Bath


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