The Bloop: Ellu Talks About Ocean Life (bizarre-looking animal)
Also weird: based on fossils, thought it was upside-down at first; the spines were thought to be its legs and the legs just tentacles. Some other researchers thought it an appendage of a larger animal.
It is described as part of Lobopodia, a taxa that is actually just an informal group for 'worms what with feet'
see also: tardigrades!