i want find out the relationship between the ones that was found in oily polluted areas with the one of thee protozoan that i have in our lab that i used for bio-remediation studies.
it seems to me that I understand what you want. Special key for this type of species does'nt exist. The question is the very poor studied, but practical importance is high. Many years ago I was arranged for such problem in Russian Sybiria, as there oil wells smtms had destroying environment for several years. But in this area biological purification mainly not effective due to low temperature over the year.
You should try to identify your species even to Phylum, or better give us some photos. RG is inhabited with a lot of perfect taxonomist. If not me, somebody will help you, but you should precise your question.