Just guess something!
Should be enough hints here:
Hint #1: predation
Hint #2: protist
Scale: thing is ~5-10um long
Hint #3: parasitism
Hint #4: I have a fetish for complex cell structure
Hint #5: multicellular forms exist in this group
Hint #6: chromalveolate
Last hint: hyphal stramenopile (this should be easy-ish now!)
Genus or cell type name would do!
Extension until tomorrow evening, where I aim to post the answer, and the Sunday Protist...
Macrocycles, flexibility and biological activity: A tortuous pairing
20 hours ago in The Curious Wavefunction