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Sorry, I was too fast in my reply and mixed the "Chaetos" - The pics of Chaetostomella show the same individual.
There were lots of Chaetorellias of both sexes active on Centaurea, and they hopped on and off each other, so misunderstandings came easily!
As to the biological meaning of "predator" (I am a biologist, too), argue with the ecologists, they use the term seed-predator commonly. Compare http://en.wikiped..._predation. But this is not a matter of this forum.
Thanks again, Sundew