[Relationship between growth rate and longevity in Tribolium castaneum and Drosophila melanogaster]

In Tribolium and Drosophila preimaginal growth rate and imaginal life-span are directly, but inversely related: the lower the growth rate, the shorter the life-span in Tribolium, the longer in Drosophila. These conflicting results, which give ground to the developmental theory of ageing, may be due to the biology of the species and to the experimental approaches.