wow, thanks so much!!! I didn't think this spider would ever be identified, because there are so many spiders and insects in Papua that have never been described. It is so cool that you found out what kind it is!
SukanyaDatta, thanks for your suggestion, but I dont think this is the one: the flower petals of this spotting are way thicker than the ones of Eichornia crassipes. also, they lack the distinct, brigt yellow/orange spot.