Test 4 Lecture Notes

Test 4 Lecture Notes - Test 4 Lecture Notes Chapter 33...

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Unformatted text preview: Test 4 Lecture Notes Chapter 33: Invertebrates Most Recent Hypothesis About Animal Phylogeny Concept 33.1: Sponges are basal animals that lack t rue tissues Porifera: Phyla Calcarea and Silicea Live in both fresh and marine waters Lack true tissues and organs Asymmetrical body Sponges Sponges are suspension feeders Filter water passing through their bodies Clicker Question Water movement through a sponge would follow what path? Pore spongocoel osculum Concept 33.2: Cnidarians are an ancient phylum of eumetazoans Cnidarians A wide range of sessile and floating forms including jellyfish, corals, and hydras Simple diploblastic, radial body plan Body plan is a sac with a central gastrovascular cavity Single opening serves as both mouth and anus Mesoglea layer between epidermis and endodermis Cnidarian Body Plans Polyp is generally sessile Medusa form moves freely in water by passive drifting of the ball Defining Feature of Cnidarians Cnidocytes Unique cells that function in defense and the capture of prey Stimulus causes the cell to evert releasing thread Some cnidocytes sting, others just entangle prey Cnidarian Diversity Clicker Question How many planes through the central axis will divide an organism with radial symmetry into roughly equal halves? Many Clicker Question Which of the following animals is responsible for more lethal attacks on humans each year? Sharks Cubozoans Snakes Killer Whales Concept 33.3: Lophotrochozoans, a clade identified by molecular data, have the widest range of animal body forms Flatworms Phylum Platyhelminthes Triploblastic development, but acoelomate Class Turbellaria Have Light-sensitive eyespots Centralized nerve net with anterior ganglia Gastrovascular cavity with 2-way pharynx Class Tremotoda Blood fluke, Schistosoma mansoni, life cycle Tapeworms Class cestoda Scolex attaches to the host Proglottids are the reproductive structures Break off after fertilization Clicker Question Spongebob is a member of which “phylum”? Porifera Clicker Question Cnidarians use _______ to immobilize or t rap prey? St raocysts Gast roderm Cnidocytes Mesoglea Rotifers Phylum rotifer Alimentary canal with separate mouth and anus Pseudocoelomate Reproduce by parthenogenesis Phylum Mollusca Class Polyplacophora A.k.a. chitons Shell has 8 plates Foot used for locomotion Radula No true head Class Gastropoda Snails and slugs Asymmetrical body usually with a coiled shell • Result of torsion, rotation of the visceral mass Foot for locomotion Radula Class Bivalvia Clams, mussels, scallops, and oysters Flattened shell with 2 valves Head reduced Paired gills No radula Mostly suspension feeders...
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This note was uploaded on 09/12/2011 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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Test 4 Lecture Notes - Test 4 Lecture Notes Chapter 33...

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