Take a look at the video here: https://webspace.utexas.edu/lhc58/protist_slideshow/

Whoa. Those are bizarre.

How serendipitous – last night, while looking at that bizarre squid with elbows, I was thinking that the ocean really is the last frontier of weirdness. Space may be "the final frontier" in terms of what's available for exploration, but in terms of things that make you say "wowww.... bizarre! and cool!" I think the ocean's got it.

From another clip- A single-celled ball about the size of a grape may provide an explanation for one of the mysteries of fossil history.
Writing in Current Biology, researchers say the creature leaves tracks on the seabed which mirror fossilised tracks left up to 1.8 billion years ago.
Many palaeontologists believe only multi-celled organisms could have made these tracks.
This has been difficult to confirm as no multi-cellular fossils of such an age have ever been found.
Seems they've been around for a while.

thanks for that tabsey