An introduction to parasitic protozoa: Form, function and life cycles BIOL 413.

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Presentation transcript:

An introduction to parasitic protozoa: Form, function and life cycles BIOL 413

Taxonomists currently recognize 7 phyla Sarcomastigophora, which includes the subphyla Sarcodina and Kinetoplastida Labyrinthomorpha, Apicomplexa, Microspora, Ascetospora, Myxozoa, Ciliophora

Of these groups, 4 are considered most important sources of human or veterinary parasites Sarcodina (Amoebas, e.g. Entamoeba histolytica) Mastigophora (Flagellates, e.g. Trypanosoma spp., Leishmania spp., Trichomonas vaginalis) Apicomplexa (possess an apical complex, e.g. Plasmodium spp., Eimeria spp., Isospora spp.) Ciliophora (ciliated protists, e.g. Balantidium coli, Ichthyophthirus multifiliis)

Distinguishing characteristics. I.: Modes of locomotion

Distinguishing characteristics. II.: Modes of reproduction

Distinguishing characteristics. III. Modes of metabolism

Examples. 1. Sarcodina

Examples. II. Mastigophora) Trichomonas vaginalisTrypanosoma spp. in blood Giardia lamblia (L) trophozoite; (R) cysts

Examples. III. Apicomplexa Plasmodium spp. life cycle Insect & human stages

Examples. IV. Ciliophora Balantidium coli trophozoiteBalantidium coli cyst Ichthyophthirus multifiliis