02_Feb18_slides - 3/14/2011...

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3/14/2011 1 Learning Objectives Identify diagnostic characteristics of “sponges”, Cnidaria, and Lophotrochozoa and explain the phylogenetic positions of these groups Identify major groupings within the “sponges”, Cnidaria, and Lophotrochozoa; describe distinguishing features among groups, where on Earth these organisms are typically found and how they make a living When presented with an organism belonging to one of the above groups, or when presented with a description of the organism, correctly diagnose the group to which it belongs ANCESTRAL PROTIST C Calcarea and Silicea Eum Cnidaria Lophotrochozoa Invertebrates are not necessarily soft: they may have hard exoskeletons or endoskeletons Common ancestor of all animals etazoa Bilateria Ecdysozoa Deuterostomia Calcarea and Silicea Which of the groups below contains vertebrates? A. Lophotrochozoa B. Ecdyozoa C. Deuterostomia D. None of them ANCESTRAL PROTIST Common ancestor of all animals Eumetazoa Cnidaria Lophotrochozoa Ecdysozoa Deuterostomia Calcarea and Silicea “sponges” Cnidaria Lophotrochozoa Ecdysozoa Deuterostomia Sponges are sedentary animals that live in water Not accurate Osculum
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3/14/2011 2 Water flow Spongocoel Osculum Choanocyte Flagellum Collar Food particles in mucus Choanocyte Phagocytosis of Choanocytes drive water flow Pore Epidermis Water flow Mesohyl Amoebocyte food particles Spicules and collagen (spongin) Amoebocytes
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02_Feb18_slides - 3/14/2011...

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