Which species have the shortest lifespans

Which organisms have the shortest lifespans? Do any research on the web, and you’ll constantly be told that the mayfly has the shortest lifespan of any organism. Is this true though? Join me as we find out which organisms REALLY have the shortest lifespans (Spoiler, it’s not the mayfly).
Picture Credits
Housefly
pixabay.com/photos/housefly-fly-insect-macro-26597…
Rat
Dunpharlain [CC BY-SA (creativecommons.org/licenses/by-sa/4.0)]
commons.wikimedia.org/wiki/File:Brown_Rat_(Rattus_…
Mayfly
pixabay.com/photos/mayfly-insect-fly-art-wing-spri…
Gambel’s quail
Mike's Birds from Riverside, CA, US [CC BY-SA (creativecommons.org/licenses/by-sa/2.0)]
commons.wikimedia.org/wiki/File:Gambel%27s_Quail_(…
Common shrew
Soricida [CC BY-SA (creativecommons.org/licenses/by-sa/3.0)]
commons.wikimedia.org/wiki/File:Sorex-araneus.jpg
Coral reef pygmy goby
commons.wikimedia.org/wiki/File:Evsig_u3.jpg
Randall, J.E. [CC BY (creativecommons.org/licenses/by/3.0)]
Gastrotrich
Nebarnix [CC BY-SA (creativecommons.org/licenses/by-sa/3.0/)]
commons.wikimedia.org/wiki/File:Gastrotrich.jpg
Labord’s chameleon
Christopher Raxworthy [Public domain]
commons.wikimedia.org/wiki/File:FurciferLabordi.jp…
creativecommons.org/licenses/by-sa/4.0/deed.en
creativecommons.org/licenses/by-sa/2.0/deed.en
creativecommons.org/licenses/by-sa/3.0/deed.en