Pathogen-Eating Detritis
With the rise of pathogens which were abundant on and around many of the dead things that the three-kernel detriti ate, inevitably a population split off to consume these specifically, as they were in great abundance. Trikaryopathogenvorous spp. are distinguished from their ancestor in that they eat living pathogens instead of dead organic matter. As eating pathogens inevitably exposes them to pathogens, they have developed markers on their organelles to identify foreign material; these are not individual-specific, but do mutate regularly to prevent easy mimicry. They have heightened chemoreceptive capabilities specifically to locate sick life-forms, and some will even intentionally enter the digestive tracts of infected fauna to feast on the pathogens within. Like their ancestor, they have 3 nuclei.