We have a 2019 thread on a marine animal that doesn't have a permanent anus:
The Spontaneous Anus: First Animal On-Demand Anal Opening Discovered
https://forums.forteana.org/index.php?threads/the-spontaneous-anus-first-animal-on-demand-anal-opening-discovered.65530/
Here are some additional...
You've probably heard the well-worn quip "Opinions are like assholes - everybody's got one."
It's now been discovered that at least one ctenophore - the warty comb jelly or sea walnut - doesn't have one - at least not a permanent one.
SOURCE...
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