More hints for Mystery Micrograph#2

As stated previously about the very obscure micrograph in question:
Hint #1: predation
Hint #2: protist
Scale: thing is ~5-10um long

More hints:
Hint #3: parasitism
Hint #4: I have a fetish for complex cell structure
Hint #5: multicellular forms exist in this group

Come on, guess something!

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New hint #6: chromalveolate
Last hint: hyphal stramenopile (this should be easy-ish now!)