Transcript الشريحة 1
Animal Taxonomy Protists (2- Trypanosoma) Systematic Position Kingdom :Protista Phylum : Sarcomastigophora Subphylum : Mastigophora Class : Zoomastigophora Genus : : Trypanosoma Speices: gambiense Trypanosoma gambiense Trypanosoma Intermediate host: insect (African tsetse fly (Glossina )) Habitat in intermediate host: alimentary canal Definite host: human. Habitat in definite host: blood of man Causes the disease: sleeping sickness. General body form: Means of locomotion: flagellum. Feeding habits: absorbing the nutrient substances from the host. Reproduction: reproduce asexually by longitudinal binary fission. Major characteristics: long slender, undulating a whip-like flagellum. • Trypanosome infect human via bite of vector organism the African tsetse fly (Glossina ) Life cycle of Trypanosome Protists (3- Plasmodium) Systematic Position Kingdom :Protista Phylum : Apicomplexa Class : : Sporozoa Genus : : plasmodium Speices: malaria Macrogametocyte Release of merozoites Formation of Merozoites Microgametocyte plasmodium malaria Ring stage Trophzoite stage • All apicomplexans are parasites of animals and some cause serious human diseases. –The parasites are tiny infectious cells (sporozoites) with a complex of organelles specialized for penetrating اhost cells and tissues at the apex of the sporozoite cell. (hence called apicomplexans) –Most apicomplexans have life cycles with both sexual and asexual stages and often require two or more different host species for completion. Plasmodium Habitat: They live inside the cell (interacellular parasite) hidden from the host immune system. Causes the disease: malaria fever to man.- spends part of its life in mosquitoes and part in humansVector: a mosquito belonging to the genus Anopheles. The infective stage : are sporozoites Life cycle: Ring stage, Trophozoite, Merzoites stage and Release of merozoites Macrogametocyte Release of merozoites Formation of Merozoites Microgametocyte Ring stage Trophzoite stage Life cycle of Plasmodium Protists (4- Paramecium) Systematic Position Kingdom :Protista Phylum : : Ciliophora Genus: Paramecium Paramecium Means of locomotion: cilia Habitat: freshwater ponds where decaying organic matter is abundant, feeding on it and on bacteria and other microorganisms. Reproduction: asexually by transverse binary fission, and sexually by conjugation . Characteristics: the numerous cilia covering the whole surface of the body. They have two contractile vacuoles and two nuclei: a large oval macronucleus (for vegetative functions), and a small micronucleus (for reproduction). • Paramecium: has cilia along the oral groovedraw in food that are engulfed by phagocytosis, and expels accumulated water from the contractile vacuole Protists (5- Amoeba) Systematic Position Kingdom :Protista Phylum: Sarcomastigophora Subphylum: Sarcodena Genus: Amoeba Species: Amoeba Nucleus Contractile vacuole Food vacuoles Pseudopodia Ectoplasm Endoplasm • Most species are heterotrophs that actively feed on bacteria and other protists. • Other species are symbiotic, including some human parasites. • Amoeboid movement occurs by changes in microtubules and microfilaments in the cytoskeleton. • Pseudopodia activity is directed toward food. • Most species are free-living heterotrophs. • Some are important parasites. • These include Entamoeba histolytica which causes amoeboid dysentery in humans. • These organisms spread by contaminated drinking water, food, and eating utensils Amoeba Habitat: freshwater ponds. Means of locomotion: pseudopodia. Reproduction mechanism: asexually by binary fission, and under unfavourable conditions it encysts. Shape and characteristics: quite irregular in shape; the body changes its shape constantly with the formation and withdrawal of Nucleus the pseudopodia. Contractile vacuole Food vacuoles Pseudopodia Ectoplasm Endoplasm The Summary