absorbing nutrients from their environs Because of the ability to convert from an autotrophic to heterotrophic life style these organisms are also called mixotrophs This change in nutritional mode exemplifies why the traditional classification of protists as animal like plant like or fungus like may be unreliable Euglena are bi flagellated note the two basal bodies in the diagram below with one flagellum being longer and hence more visible than the other The surface of Euglena is covered by a pellicle which consists of the plasma membrane along with ridges and grooves 33 Photoreceptor Lament Eyespor stigma Nucleolus Euglena Cytology 34 Flagellum Nucleus Polysaccharide storage Mitochondrion Chloroplast Pyrenoid Pellicle Examine both prepared slides and living cultures of Euglena if available in the laboratory Living culture media will require a drop of detergent to slow the organism for viewing These slides must be then washed after viewing with soapy water as the Protoslo may be very viscous The chemical functions by setting up a carbohydrate matrix in which organisms become imprisoned Euglena sp Q What is the mode of movement for these organisms Q How do they obtain nutrients energy d Trypanosoma Trypansomes are parasitic heterotrophs and produce diseases such as African sleeping sickness carried by the tsetse fly and Chagas disease carried by the assassin bug in South America The life cycle of Trypanosoma brucei the species that causes African sleeping sickness is shown in the following diagram