fuzzynecromancer asked:
bogleech answered:
basically as visually-oriented beings we judge everything based first on surface aesthetic but organisms are really more defined by the microscopic level so we keep being surprised.
I NEVER get over the fact that jellyfish, or at least some sot of cnidarian, evolved into basically a skin disease at some point.
Myxozoa or “slime animals” are single-celled organisms that grow in the tissues of fish, causing tissue death or serious deformities in the host until they grow into a visible “plasmodium,” just like a slime mold.
They were once thought to be protozoa, but genetic sequencing proved they were cnidarian animals just like jellyfish, sea anemones and corals.
Their drifting “spore” phase even has a microscopic harpoon-like structure derived from what were the stinging cells of their ancestral jellies.

Here’s a bunch of them!
Now what’s even MORE absurd is when genetic sequencing proved a type of parasitic “worm” to be a myxozoan.

So this “worm” is back to being a multi-celled animal that can slither around on its own and has a body symmetry completely unrelated to that of any other cnidarians.
Some sort of jellyfish over millions of years evolved back down to a single-celled form, and then one of those single-celled organisms re-evolved a more animal-like body again, completely and totally different but still genetically a cnidarian! Still equipped with the harpoon cell, too!

















