LEC 25 - BIS2C Winter 2009 (Ward) Lecture 25. Introduction...

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BIS2C Winter 2009 (Ward) Lecture 25. Introduction to Metazoa (animals) Today’s lecture (23 February) recap: eukaryote tree metazoan features major lineages of animals Wednesday’s lectures sponges Cnidaria
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From: Lane & Archbold. 2008. Trends Ecol. Evol. 23:268-275
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Which of the following statements is false ? 1. Fungi and animals are sister taxa 2. Fungi are more closely related to animals than to plants. 3. The closest living relatives of animals are the choanoflagellate protists 4. Metazoans are a monophyletic group
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Major eukaryote lineages
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Land plants Major eukaryote lineages
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Land plants Fungi Major eukaryote lineages
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Metazoa Land plants Fungi Major eukaryote lineages
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Which of the following features characterizes opisthokonts as a group? 1. Haplontic life cycle 2. Reduction of dikaryon stage 3. Flagellum, when present, single and posterior 4. Multicellularity
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Choanoflagellates small group of aquatic heterotrophic eukaryotes ca. 140 species, some unicellular, others colonial cell similar in structure to sponge choanocytes
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Choanoflagellates cell ovoid, with a collar of microvilli (tentacles) surrounding the single flagellum movement of flagellum (1) locomotion and (2) feeding (bacteria trapped on collar)
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Choanoflagellates cell ovoid, with a collar of microvilli (tentacles) surrounding the single flagellum movement of flagellum (1) locomotion and (2) feeding (bacteria trapped on collar)
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Choanoflagellates cell ovoid, with a collar of microvilli (tentacles) surrounding the single flagellum movement of flagellum (1) locomotion and (2) feeding (bacteria trapped on collar)
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Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates and sponges)
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Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates and sponges) 2. Structure of mitochondria
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Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates and sponges) 2. Structure of mitochondria 3. DNA sequence data
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Black dot: PP 1.0; red dot: PP 1.0, ML BS 100%
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LEC 25 - BIS2C Winter 2009 (Ward) Lecture 25. Introduction...

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