So far I have caenorhabditis elegans (worm) which has a lifespan of about 20 days, and drosophila melanogaster (fruit fly) which lives to about 30 days. I would like to find something that lives as short as possible but is as closely related to higher eukaryotes as possible. Can you name an organism that lives naturally to less than 10 days?? This would be much better for the experiment that I am trying to run in the near future. Thanks!