Lab 6

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Lab 6

• Various Protista

2
Dictyosteliomycota

• Common name Cellular slime molds
• Synonyms Acrasiomycota (in part)
• Mode of nutrition Heterotrophic ingestive
• Habitat Terrestrial moist decaying vegetation
• Growth habit Unicellular myxamoebae (ingestive
  cells), multicellular dispersal structure
• Cell wall None in myxamoebae, cellulose in
  sporangium

3
Dictyosteliomycota

• Undulipodia (flagella) None
• Food storage Glycogen
• Clonal reproduction Mitosis of myxamoebae
  production of aplanospores for dispersal
• Sexual reproduction Rare and poorly known
• Representative genera Dictyostelium
• Recognized by slugs, individual (not grouped)
  stalked sporangia

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Dictyostelium
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Myxomycota

• Common name Plasmodial slime molds
• Synonyms Mycetozoa
• Mode of nutrition Heterotrophic ingestive
• Habitat Terrestrial moist decaying vegetation
• Growth habit Multinucleate single-cell
  plasmodium
• Cell wall None
• Undulipodia (flagella) One or two whiplash on
  aquatic haploid uninucleate cells otherwise none

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Myxomycota

• Food storage Glycogen
• Clonal reproduction None
• Sexual reproduction Diploid phase resembles
  diploid dominant haploid phase resembles
  unicellular
• Representative genera Arcyria, Dictydium,
  Physarum, Stemonitis
• Recognized by Plasmodium meiosporangia often
  clustered.

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D Physarum plasmodium
Myxomycota
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D Stemonitis
Myxomycota
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A Stemonitis
Myxomycota
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D Arcyria
Myxomycota
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D Arcyria
Myxomycota
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D Dictydium
Myxomycota
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A Dictydium
Myxomycota
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D Lamproderma
Myxomycota
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D Lamproderma
Myxomycota
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D Physarum
Myxomycota
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A Lycogala
Myxomycota
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Euglenophyta

• Common name Euglenas
• Synonyms None
• Mode of nutrition Autotrophic green
  chloroplasts (secondary), or heterotrophic by
  ingestion
• Habitat Freshwater
• Growth habit Unicellular
• Cell wall None (a proteinaceous pellicle beneath
  the plasma membrane provides stiffness)

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Euglenophyta

• Undulipodia (flagella) Whiplash one long for
  swimming, one short, confined to the vacuole
• Food storage Paramylon
• Clonal reproduction Mitosis by unicells
• Sexual reproduction None known
• Representative genera Euglena, Phacus
• Recognized by Green but no cell wall, eyespot
  often prominent

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U Euglena
Euglenophyta
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D Euglena
Euglenophyta
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Dinophyta

• Common name Dinoflagellates
• Synonyms Pyrrhophyta
• Mode of nutrition Autotrophic brown
  chloroplasts (secondary), or heterotrophic by
  ingestion
• Habitat Marine, freshwater
• Growth habit Unicellular
• Cell wall Cellulose or none

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Dinophyta

• Undulipodia (flagella) Ordinarily two
  whiplash, one in equatorial groove and one in
  longitudinal groove
• Food storage Chrysolaminarin
• Clonal reproduction Mitosis by unicells
• Sexual reproduction Poorly known in many
  species, some with complex sexual cycles
• Representative genera Ceratium, Gonyaulax,
  Noctiluca, Peridinium, Pfiesteria
• Recognized by Grooves for flagella

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A Peridinium
Dinophyta
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A Noctiluca
Dinophyta
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A Ceratium
Dinophyta
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Rhodophyta

• Common name Red algae
• Synonyms None
• Mode of nutrition Autotrophic red chloroplasts
• Habitat Marine, freshwater
• Growth habit Multicellular filamentous or
  plectenchyma multicellular crusts and films,
  rarely unicellular.
• Cell wall Cellulose, galactans such as agar and
  carrageenan

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Rhodophyta

• Undulipodia (flagella) None (no basal bodies)
• Food storage Floridean starch
• Clonal reproduction aplanospores
• Sexual reproduction Isomorphic alternation of
  generations with interpolated carposporophyte
  phase, oogamous
• Representative genera Chondrus, Corallina,
  Polysiphonia, Porphyra
• Recognized by Red plants no flagella
  cystocarps tetraspores

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A Polysiphonia tetrasporophyte
Rhodophyta
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A Polysiphonia male gametophyte
Rhodophyta
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A Polysiphonia cystocarp
Rhodophyta
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D Polysiphonia
Rhodophyta
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D Various red algae
Rhodophyta
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D carrageenan
Rhodophyta
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D agar
Rhodophyta
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D nori
Rhodophyta