Eukaryotes. Major groups eukaryotes covered in a Micro courseProtozoaFungiAlgaeHelminths (we\'ll save these till later)We\'ll cover the medical importance of all of these groups in later lectures!. Classification of Eukaryotic Organisms. Figure 12.4. Protozoa. Diverse group defined by three characteristicsEukaryoticUnicellularLack a cell wallWith exception of apicomplexans (much more about these guys later!), they are motile by means of cilia, flagella, and/or pseudopodia.