Microsoft PowerPoint - 28- protists revised.pdf - NSD Main

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• Kelps, or giant seaweeds– Live in deep parts of the oceanAlternation of Generations• The most complex life cycles include analternation of generations– The alternation of multicellular haploid anddiploid formsFigure 28.19Copyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsCopyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsCercozoans and radiolarians have threadlikepseudopodia• A newly recognized clade, Cercozoa– Contains a diversity of species that are amongthe organisms referred to as amoebas• Amoebas were formerly defined as protists– That move and feed by means of pseudopodia• Cercozoans are distinguished from most otheramoebas– By their threadlike pseudopodiaCopyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsForaminiferans (Forams)• Foraminiferans, or forams– Are named for their porous, generallymultichambered shells, called testsFigure 28.22Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings20 µm• Pseudopodia extend through the pores in thetestRadiolarians• Radiolarians are marine protists– made of silica– That phagocytose microorganisms with theirpseudopodiaCopyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsCopyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings6
Amoebozoans have lobe-shaped pseudopodia• Amoebozoans– Are amoeba that have lobe-shaped, ratherthan threadlike, pseudopodiaGymnamoebas• Gymnamoebas– Are common unicellular amoebozoans in soilas well as freshwater and marineenvironments– Include gymnamoebas, entamoebas, andslime moldsCopyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsCopyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings• Most gymnamoebas are heterotrophic– And actively seek and consume bacteria andother protistsEntamoebas• Entamoebas– Are parasites of vertebrates and someinvertebrates40 µmPseudopodia• Entamoeba histolytica– Causes amebic dysentery in humansFigure 28.24Copyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsCopyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsSlime Molds• Slime molds, or mycetozoans– Were once thought to be fungi• Molecular systematicsPlasmodial Slime Molds• Many species of plasmodial slime molds– Are brightly pigmented, usually yellow ororange4 cm– Places slime molds in the clade AmoebozoaFigure 28.25Copyright © 2005 Pearson Education, Inc. publishing as Benjamin CummingsCopyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings7
Page 1 and 2: Chapter 28ProtistsBelong to the div
Page 3 and 4: Kinetoplastids• Kinetoplastids- H
Page 5: 3 µmDiatoms• Most oomycetes- Are

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