More about existential threats. Turns out Radiolarians and Acantharians right here on earth are very distantly related to Akquidores. Fortunately, our local varieties have enough trouble getting along with each other they don't pose much of a threat, at least so far.
Hell, Radiolarians can't even get along with themselves. They come in 2 toxic-to-each-other flavors: Spumellarians and Nassellarians. Naselars are nasty to the Spumelers who fume and spume right back. Just thank the cosmic muffin they don't have laptops.
Without the virulent evil, our home grown versions are quite similar to their off world cousins. If you think all this a bit much, could be, but fact is stranger than fiction - just checkout Radiolaira.org
The oceans are full of them and have been for hundreds of millions of years! That's life...