1. Stramenopiles, red algae, green algae and amoeboids

2. STRAMENOPILES
All have numerous fine, hair-like projections on the flagellae.
Photosynthetic organisms have chloroplasts housed within a double membrane with cytoplasm + ‘nucleus’
Diatoms
Golden algae
Brown algae
Water moulds

3. Diatoms Diatoms have a siliceous case like a Petri-dish
Some rocks are formed almost entirely of fossil diatoms (diatomite or diatomaceous earth). These deposits are mined commercially as abrasives and for filtering.

4. Golden Algae
golden algae are common in fresh water. Some species are colorless, but the vast majority are photosynthetic.
They are particularly important in lakes, where they may be the primary source of food for zooplankton.
They are named for their yellow and brown carotene and Xanthophyll accessory pigments.

5. Brown Algae The largest and most complex algae Eaten as a human food
Used as fertiliser
Produce agar, a gelling agent

6. Water Moulds Cellulose cell wall Diploid nuclei
Free-swimming spores bear two dissimilar flagella, one with fine, hair-like projections
Important pathogens
root rotting fungi,
seedling dampening mould,
blister rusts, white rusts
downy mildews
Phytophthora infestans - late blight

7. RHODOPHYTA - the Red Algae
No flagellated stages in the life cycle.
Phycoerthyrin gives the red colour
Larger specimens are eaten (Dilisk = Porphyra)

8. Green algae
The most ‘plant-like’ of all ‘protists’ with cellulose cell walls, chlorophylls a and b, carotene accessory pigments, alternation of generation.
Charaphytes are particularly close
Vary from unicells to complex multicellular structures

9. Alternation of generation
A life cycle where there is both a multicellular haploid (gametophyte) and diploid (sporophyte) phase to the life cycle
Diploid sporophyte 2N
Fusion
Meiosis
Spores N
Gametes
Haploid gametophyte

10. Amoeboid protists
Slime moulds

11. Slime moulds
Long classified as part of the Fungi, slime "molds" are now known to be quite unrelated to the fungi.
When conditions become unfavorable, these slime molds aggregate together and form sporangia often on the tips of stalks
There are three groups of slime molds.
Cellular
Acellular
Slime nets (now put into the Stramenopiles)

12. Cellular slime moulds
Cellular slime molds (e.g. Dictyostelium) spend most of their lives as separate single-celled amoeboid protists, but upon the release of a chemical signal, the individual cells aggregate into a great swarm.
Haploid

13. Haplontic life cycle
A life cycle where there is only a multicellular haploid (gametophyte) phase to the live cycle
Immediate spore production 2N
Fusion
Meiosis
Spores N
Gametes
Haploid gametophyte

14. Acellular slime moulds
Plasmodial slime molds, like Physarum shown here, are basically enormous single cells with thousands of nuclei (coenocytic).
Diploid

15. Diplontic life cycle
A life cycle where there is only a multicellular diploid (sporophyte) phase to the live cycle and the haploid (gametophyte) phase is unicellular
Diploid sporophyte 2N
Fusion
Meiosis N
Gametes

16. Amoeboids Form pseudopodia to engulf their prey 3 subgroups
Rhizopods / Amoebas - flowing cytoplasm
Actinopods (Heliozoans and Radiolarians) - slender pseudopodia
Foraminiferans - calcareous shells

17. Entamoeba histolytica (amoebiasis/amoebic dysentery)
Humans are infected by ingesting cysts, most often via food or water contaminated with human fecal material

18. Actinopods
Have slender, flexible pseudopodia extruded through the cell wall.

19. Foramenifera Stiff pseudopodia extruded through the cell wall.
Can form sybioses with photosynthetic protists.