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nester12 - Chapter 12 The Eukaryotic Members of the...

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Chapter 12: The Eukaryotic Members of the Microbial World
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Important Point:
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Three-Domain Classification These are the Eukaryotes. All but plants will be considered in this chapter.
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Algae “Algae” are not found in the three-domain classification scheme. This is because “Algae” is not a legitimate taxonomic category. “…we will use the term algae to describe the photosynthetic members” of domain Eucarya formerly assigned to kingdom Protista. Algae are aquatic (and moist terrestrial) oxygenic phototrophs. There are both unicellular and macroscopic (and everything in between) algae. The algae Gymnodinium breve and Gonyaulax spp. produce toxins that can and have harmed humans, e.g., paralytic shellfish poisoning.
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The Green Columns are Algae Note that the algae are all over the place. It apparently is relatively simple for a eukaryote to become photosynthetic (i.e., acquisition of photosynthesis is a product of convergent evolution).
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The Red Columns are Protozoa Note that the protozoa are also somewhat dispersed. The diversity of protozoa reflects that fact that the more primitive and therefore older eukaryotes presumably were unicellular.
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Protozoa “Protozoa” are not found in the three-domain classification scheme. This is because “Protozoa” is not a legitimate taxonomic category. “…we will use the term [protozoa] to describe the [non-] photosynthetic [and unicellular] members” of domain Eucarya formerly assigned to kingdom Protista.
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