Zoology 10th Edition by Stephen Miller,John Harley

Exercise 14

According to the most recent classification of protists, there are six supergroups. The four protozoaon supergroups and several common examples within each are discussed in this chapter. These include the Excavata that possess a cytostome and a posterior flagellum. Examples include Giardia, Trichomonas, Euglena, and Trypanosomes. Members of the Amoebozoa possess pseudopodia and examples include Amoeba, Naegleria, and Entamoeba. Forminiferans and radiolarians are common marine Rhizaria that possess filopodia. Difflugia is a representative example of the Rhizaria. The Chromalveolata are a very diverse supergroup of protists protozoans. They are all united in the common feature of having a plastid origin. The Alveolata is a large supergroup that includes the dinoflagellates and ciliates. Members of the Apicomplexa are all parasites and include the malaria causing Plasmodium. Many Apicomplexans have a three-part life cycle involving schizogony, gametogony, and sporogony.
Why would it be very difficult to find a poison to fight the malaria-causing protists Plasmodium?