So from the wiki

The monophyly of Xenacoelomorpha soon became established, but its position as either a basal bilaterian clade or a deuterostome remained unresolved until 2016, when two new studies, with increased gene and taxon sampling, again placed Xenoturbella as the sister group of Acoelomorpha within Xenacoelomorpha, and placed Xenacoelomorpha as sister to Nephrozoa (Protostomia plus Deuterostomia), and therefore the basalmost bilaterian phylum<

Seems like “where on the tree of life” is “the first bilaterals” which makes sense. They seem very worm-like in bodyplan. Shit from the Pre-Cambrian can look pretty alien and have shaky relationships to more derived species.

Has no organs

Looks inside…

…organs.

“existing for no clear reason”

So like every other life form we know of?

Would.

No clear reason? It’s because the thing can successfully make more of itself before dying. That’s literally it.

See also: ticks

It’s disturbing to me that so many people search for what something is used for or what’s the value or right to life a creature has. The point of life is to live. If you are successful you maybe make a child or split into a copy of yourself when you get enough food.

Purpose is something you accept for yourself. Imposing it on others is diabolically evil when they don’t have a thing to do with your clade. And still, it would be the case that a person would look at an animal and say “what’s the point of you?”