Kingdom Protista: Algae and Heterotrophic Protists Chapter 15
Heterotrophic Phyla Oomycota- water molds. Myxomycota- plasmodial slime molds. Dictyosteliomycota- cellular slime molds.
Oomycota- water molds Characteristics Unicellular, coenocytic and filamentous. Saprophytic and parasitic. Food reserve- glycogen. Eukaryotic nucleus. Zoospores- 1 tinsel and 1 whiplash. Cell wall cellulose/cellulose-like. Habitat- marine, freshwater, terrestrial. 700 species. Examples- Saprolegnia and Phytophthora.
Phytophthora- sudden oak disease, Ireland potato famine, crop destruction.
Myxomycota- plasmodial slime molds Characteristics Streaming protoplasm. Saprophytic and engulf bacteria, yeast, fungal spores. Food reserve- glycogen. Eukaryotic nucleus. Gametes- 2 unequal, apical, whiplash. No cell wall. Habitat- terrestrial. 700 species. Example- Physarum.
Dictyosteliomycota- cellular slime molds Characteristics Amoeba-like cells that form slugs. Engulf bacteria. Food reserve- glycogen. Eukaryotic nucleus. Flagella- none. Cell wall cellulose. Habitat- terrestrial. 50 species. Examples- Dictyostelium.
Dictyostelium- cellular slime mold
Dictyostelium
Photosynthetic Phyla (the algae) Myzozoa- dinoflagellates. Euglenozoa- euglenoids. Cryptophyta- cryptomonads. Haptophyta- haptophytes. Chlorophyta- green algae. Rhodophyta- red algae. Heterokontophyta- heterokont algae. Phaeophyceae- brown algae. Chrysophyceae- golden-brown algae. Bacillariophyceae- diatoms.
Myzozoa- dinoflagellates Characteristics Unicellular, colonal. Chlorophylls A and C, peridinin. Food reserve- starch in cytoplasm. Thylakoids in 3. Mesokaryotic nucleus. Flagella- 1 transverse and 1 longitudinal. Cell wall with cellulose in thecal plates. Habitat- marine and freshwater. 4,000 species. Examples- Ceratium, Peridinium, Dinophysis, Alexandrium, Pfiesteria.
Pfiesteria piscicida
Euglenozoa
Euglenozoa- euglenoids Characteristics Unicellular. Chlorophylls A and B, carotenoids. Food reserve- paramylon in cytoplasm. Thylakoids 2-3. Mesokaryotic nucleus. 2 unequal flagella, long one with hairs. No cell wall, proteinaceous pellicle. Eyespot. Habitat- marine and freshwater; puddles, ditches, ponds, streams, lakes, rivers. 1,000 species. Example- Euglena.