Alistipes finegoldii is a bacterium from the genus of Alistipes which has been isolated from appendix tissue from a human from Helsinki in Finland. The species is named in honor of Sydney M. Finegold. A. finegoldii is a gram negative straight rod shaped bacterium commonly found in the human gut biome that grows anaerobically. The general size ranges from 0.8 to 2 micrometers in length with rounded ends.