BIOL 152 1st Edition Lecture 13 Outline of Last Lecture Animal Body Plans Outline of Current Lecture Animal Classes and Phylogeny Current Lecture Invertebrates Metazoa Porifera Multicellular lack true tissues asymmetrical Suspension feeders Specialized cells Sequential hermaphrodites produce sperm and egg Flagellated swimming larvae o Choanocytes phagocytosis o Amoebocytes spicules Eumatoza Cnidaria Diploblastic radial symmetry Gastro vascular cavity one opening Two body plans o Sessile poly hydras anemones corals mouth up o Floating medusa jellies mouth down hydrostatic skeleton Carnivores o Tentacles with cnidocytes i e nematocysts o Medusae have hydrostatic skeleton Non centralized nervous system nerve net Three groups of Cnidarians Cubozoa Schyphozoa Anthozoa Ctenophora These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Diploblastic radial symmetry Largest animals known to use cilia for locomotion Variety of feeding mechanisms using sticky tentacles beating cilia or ingesting whole Large portion of ocean s planktonic biomass Lophotrochozoa Named for two distinct traits that occur in some phyla Lophophore feeding structure with ciliated tentacles around the mouth Trochophore larvae has a ring of cilia around its middle used for locomotion Rotifers Marine FW and damp soils Pseudocoelom and hydrostatic skeleton Suspension feeders that use a crown of cilia to draw water into the mouth o Alimentary canal separate mouth and anus Reproduction is often parthenogenic some species produce males that only live long enough to fertilize eggs Amazing because they have been around for a long time Platyhelminthes Flatworm Dorsoventrally flattened and aquatic Breath through the diffusion of gases and water Acoelomate Platyhelminthes Turbellaria Planarians Free living Gastro vascular cavity Centralized nervous system Asexual and sexual reproduction Ganglia consists of a simple brain Platyhelminthes Trematoda Parasitic Complex life cycle asexual and sexual stages Shistosoma mansoni uses human host for sexual reproduction then larvae infect snails where asexual reproduction occurs Platyhelminthes Cestoda Parasitic i e tapeworms Scolex Lack gastro vascular cavity Proglottids Lophophorates Complex cilia around mouth Alimentary canal True coelom Sessile often colonial o Ectoproct and Brachiopod Annelida Segmentation True coelom Hermaphrodites Class Oligochaetae earthworms o o o Cerebral ganglia Ventral nerve cord Closed circulatory system Class Polychaetae Christmas tree worm Class Hirudinea leeches Mollusca True coelom Many have a trochophore larvae Suspension feeders ingest plants or animals Chitons Gastropoda and Cephalopoda 3 main body parts Muscular foot visceral mass mantle radula Mollusca Gastropoda Snails and slugs Largest class of mollusks Mollusca Bivalvia Two hinged shells made of calcium carbonate Mollusca Cephalopod No shells Closed circulatory system Predators large brains and eyes with sophisticated lenses
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