After reading your comment I did some research, and you're right, they don't have anuses, so they just store all their poop in their abdomens until they die, when they decompose and release that poop all at once. So there's that to look forward to.
"Mark Twain" had a posthumously published essay in which God points out that, just as one builds a boarding-house for the benefit of its boarders and not of the building, man was created for the benefit of his microbial population.