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The idea proposed initially by Lynn Margulis of how eukaryotes came to exist was that a large anaerobic bacterium engulfed a smaller aerobic bacterium. The aerobic bacterium was capable of converting the energy in reduced carbon compounds to ATP at a much higher rate than anaerobic bacterium. So the larger bacterium got the benefit of much more energy for each molecule (sugar, typically) that it "ate." The smaller bacterium got the benefit of protection from predators. This was a mutually beneficial relationship and not parasitism.

And I don't think that endosymbiosis (mitochondrion/chloroplasts/protonuclei) leads to necessarily a separate species initially, but only because it is incredibly hard to define "species" in the absence of sexual reproduction. Essentially, each separate bacterium (and there are something like 5x10^30 bacteria in the world) forms its own "species," as there is reproductive isolation between each bacterium.

Also, maybe you would like to define "eukaryote", because I am not entirely sure why you think that you are not a eukaryote.

nah it's not thqat hard- yep- there's plenty of bacteria- they are all the same 'kind' something like 200 hummingbirds- but 'all' are hummingbirds regardless of the amount of micro-evolutiojn that goes on- they remain the same 'kind' (People often try to discount the noah ark story by claiming "You couldn't fit all the species on the ark'- but Noah didn't have to- just all the 'kinds' on the ark was sufficient, and YES there wqas plenty of room) Lynn had to admit in the end that it was nothing but simbiotic relationship because the facts were exposed- this is something the textbooks won't tell you but if you search, you will find the obscure resports on this- this is one of those reports I've lost and wish I remembered where it was- it won't be easy because when you google eukoroytes/simbiosis, you'll get a ton of evo articles all claiming the same thing- that it proves evo- but there are several reports that showed she had to admit it wasn't in the end buried within those articles.