kingdom+protista

ZOOLOGY NOTES—KINGDOM PROTISTA SUBKINGDOM PROTOZOA INTERESTING FACTS ABOUT PROTOZOANS: Over 64,000 species have been named Their skeletons form huge ocean soil deposits CHARACTERISTICS OF THE SEVEN PROTOZOAN PHYLA · Unicellular organisms; some live in colonies · Mostly microscopic · All symmetries (Asymmetrical, radial, bilateral) are present in the group · No ‘germ layer’ is present during development · No organs or tissues; organelles are specialized; some have more than one nucleus · Organisms can be free-living, mutualistic (both partners benefit), commensalistic (one partner benefits, the other is not affected), or parasitic (one partner benefits, the other is harmed) · Some with a simple endoskeleton or exoskeleton; most are naked, with no skeleton · Locomotion (movement) by pseudopodia, flagella, or cilia; some are sessile (attached to a substrate) · Nutrition is of all types: Autotrophic (manufactures its own nutrients by photosynthesis), heterotrophic (depends on other plants or animals for food), saprozoic (uses nutrients dissolved in the surrounding medium—soil, water, etc.) · Aquatic or terrestrial · Reproduce asexually by fission, budding, or formation of cysts; sexually by conjugation or by syngamy (union of male and female gametes to form a zygote)