BIOL 152 1st Edition Lecture 13Outline of Last Lecture - Animal Body Plans Outline of Current Lecture - Animal Classes and Phylogeny Current Lecture- InvertebratesMetazoaPorifera:- Multicellular, lack true tissues, asymmetrical- Suspension feeders- Specialized cells- Sequential hermaphrodites – produce sperm and egg - Flagellated swimming larvaeo Choanocytes – phagocytosis o Amoebocytes – spiculesEumatozaCnidaria:- 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 biomassLophotrochozoaNamed 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 locomotionRotifers:- Marine, FW and damp soils- Pseudocoelom and hydrostatic skeleton- Suspension feeders that use a crown of cilia to draw water into the moutho 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- AcoelomatePlatyhelminthes: 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 occursPlatyhelminthes: Cestoda- Parasitic (i.e. tapeworms)- Scolex- Lack gastro vascular cavity- ProglottidsLophophorates: - Complex cilia around mouth- Alimentary canal - True coelom - Sessile, often colonialo Ectoproct and BrachiopodAnnelida: - Segmentation- True coelom- HermaphroditesClass Oligochaetae – earthwormso Cerebral gangliao Ventral nerve cordo Closed circulatory systemClass Polychaetae – Christmas tree wormClass Hirudinea – leechesMollusca: - 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 - radulaMollusca: Gastropoda - Snails and slugs- Largest class of mollusks Mollusca: Bivalvia- Two hinged shells, made of calcium carbonateMollusca: Cephalopod - No shells - Closed circulatory system- Predators – large brains and eyes with sophisticated
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