[pleurotus]

That's more a flaw of classification systems though. Because even if they comprise a distinct life form does not mean they need to have a unique species. Consider lichen, which comprise two (or more!) separate "species" which becomes a meaningless distinction when they cannot survive on their own, or even if they could, not in a form recognizable in any wayas they were when they were a part of the symbiotic system

[hughesjj]

I mean at that point what do we consider multicellular organisms? Did you see what was going on with those frog skin cells and "xenobots"? Also, our gut bacteria kinda makes us a symbiote at a larger scale.