Protozoan

characteristics of protozoans

1. Kingdom Protista PROTOZOANS Animal-like Protists

2. General Characteristics Single-celled or unicellular organisms; Size = microscopic (3 to 1,000 microns). No germ layers, tissues, or organs; However, specialized intracellular "organelles" are present

3. General Characteristics Locomotion by pseudopodia, flagella, or cilia. Symmetry = all types (bilateral, radial, or asymmetrical) Free living, commensal , parasitic, or mutualistic Mostly naked, but few have simple protective exoskeletons (tests). Ex. = Arcella

4. 4 Animal-like protists classified by the structure used for movement: 1) Cilia - 2) Flagellum(a) - Coordinated movement between individual cilia Back and forth wave motion tiny beating hair-like structures whip-like tail(s) All heterotrophs

5. 5 3) Pseudopodia - Animal-like protists projection of cytoplasm that sticks out like a foot (“false foot”) 4) Sessile - No locomotion (_________) movement

6. General Characteristics Nutrition = heterotrophic, parasitic Reproduction: asexual = longitudinal and transverse binary fission, budding, Reproduction: sexual - conjugation

7. Amoeba Contractile Vacuole Nucleus Food Vacuole Phagocytosis Pseudopod Hyaline Cap

8. Figure 11.05 Amoeba hunting food

9. Left: live  Amoeba proteus  (100 x). Right: fixed, stained  Amoeba  with diatoms, nucleus (stained dark pink).

10. Arcella Test Pseudopod Side View

11. Trypanasoma Trypanosoma organism Red Blood Cells

12. Paramecium

13. Binary Fission – Asexual Reproduction

14. Conjugation – sexual reproduction

15. Vorticella

16. Stentor