There will be more species in creature phase. But once you get to space phase only 9 species per planet i believe. I guess this is for 2 reasons, firstly the amount of ram/processor power it would use to have more creatures per planet as you fly round them would probably cause slow down. And secondly its because of the sim/micro management part of spore that your meant to be able to manage the ecosystems, so they had to set up some sort of easy way for you to do this. having a set number of species is an easy step for them to do.
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