Phylum Myxomycota Phylum Acrasiomycota Phylum Oomycota

Presentation on theme: "Phylum Myxomycota Phylum Acrasiomycota Phylum Oomycota"— Presentation transcript:

1 Phylum Myxomycota Phylum Acrasiomycota Phylum Oomycota
FUNGUS-LIKE PROTISTS Phylum Myxomycota Phylum Acrasiomycota Phylum Oomycota

2 CHARACTERISTICS why fungus-like? with centrioles
appearance mode of nutrition with centrioles no chitin in cell walls non-photosynthetic 2-stage life cycle spore-bearing mold-like stage free-living amoeba-like stage Stemonitis fusca Comatricha typhoides

3 Dominant state near rich sources of food
(phagocytic) Fruiting body Spore-bearing structure Cells aggregate into a slimy mass when food is scarce and moves to a better location

4 SLIME MOLDS Phylum Acrasiomycota Phylum Myxomycota
Cellular slime molds Phylum Myxomycota Acellular slime molds

5 Phylum Myxomycota Acellular or plasmodial slime molds
plasmodium large cytoplasmic mass (multinucleate) feeding stage unfavorable conditions: “fruiting” sporangia spring up from plasmodium meiosis  haploid spores flagellated gametes →diploid zygote (sexual reproduction) →*diploid amoeboid cells e.g. Physarum

6 http://home. sandiego. edu/~gmorse/2009BIOL221/Study_guide2/plasmodial

7 Physarum polycephalum

8 Comatricha typhoides

9 Lycolaga epinendrum “wolf’s milk”

10 Stemonitis splendens “chocolate tube slime”

11 Arcyris denudata “carnival candy slime”

12 Brefeldia maxima “tapioca slime”

13 Tubifera ferruginosa “red raspberry slime”

14 http://xkcd. com/877/ , http://www. uknature. co. uk/F. septica
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15 Phylum Acrasiomycota cellular slime molds
pseudoplasmodium separated by cell membranes cell aggregation slug-like form migrates to form fruiting body spores by mitosis e.g. Dictyostelium discoideum

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17 Phylum Oomycota water molds/downy mildew
cellulosic cell wall live on organic matter in water, plant parasites on land hyphae  finely-branched single-celled filaments coenocytic/aseptate  no walls between cells motile spores Phytophthora infestans 

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19 Significance decomposers food source of other organisms
parasites of plants (grapes, tomatoes, potatoes) and animals used to plan routes (shortest distance) rich areas for biological study