TAILIEUCHUNG - Lecture Biology (7th edition) - Chapter 33: Invertebrates

This chapter describe how a sponge feeds and digests its food, list the characteristics of the phylum Cnidaria that distinguish it from other animal phyla, list the four classes of Cnidaria and distinguish among them based on life cycle morphology, list the characteristics of Platyhelminthes and distinguish among the four classes, describe the features of molluscs and distinguish among the four classes,. | Chapter 33 Invertebrates Overview: Life Without a Backbone Invertebrates Are animals that lack a backbone Account for 95% of known animal species Figure A review of animal phylogeny Ancestral colonial choanoflagellate Eumetazoa Bilateria Deuterostomia Porifera Cnidaria Other bilaterians (including Nematoda, Arthropoda, Mollusca, and Annelida) Echinodermata Chordata Figure Exploring invertebrate diversity PORIFERA (5,500 species) A sponge CNIDARIA (10,000 species) A jelly PLACOZOA (1 species) KINORHYNCHA (150 species) mm A placozoan (LM) A kinorhynch (LM) 250 µm PLATYHELMINTHES (20,000 species) ROTIFERA (1,800 species) A marine flatworm A rotifer (LM) ECTOPROCTA (4,500 species) PHORONIDA (20 species) Ectoprocts Phoronids Figure Exploring invertebrate diversity BRACHIOPODA (335 species) NEMERTEA (900 species) A brachiopod A ribbon worm ACANTHOCEPHALA (1,100 species) CTENOPHORA (100 species) An acanthocephalan A ctenophore, or comb jelly MOLLUSCA (93,000 species) ANNELIDA (16,500 species) An octopus A marine annelid LORICIFERA (10 species) PRIAPULA (16 species) 5 mm 50 µm A loriciferan (LM) A priapulan Figure Exploring invertebrate diversity NEMATODA (25,000 species) ARTHROPODA (1,000,000 + species) A roundworm A scorpion (an arachnid) CYCLIOPHORA (1 species) TARDIGRADA (800 species) 100 µm 100 µm A cycliophoran (colorized SEM) Tardigrades (colorized SEM) ONYCHOPHORA (110 species) HEMICHORDATA (85 species) An onychophoran An acorn worm ECHINODERMATA (7,000 species) CHORDATA (52,000 species) A sea urchin A tunicate Figure Sponges are sessile and have a porous body and choanocytes Sponges, phylum Porifera Live in both fresh and marine waters Lack true tissues and organs Sponges are suspension feeders Capturing food particles suspended in the water that passes through their body Azure vase sponge (Callyspongia plicifera) Osculum Spicules Water flow Flagellum Collar Food particles in mucus Choanocyte Phagocytosis of food particles Amoebocyte .

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• Campbells Biology
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• Biological sciences
• Biological organization
• Systems biology
• Animal phylogeny
• Restoration ecology
• Conservation biology
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• The chemical context of life
• Water molecules
• The molecular diversity of life
• Function of macromolecules
• Membrane structure
• Metabolism transforms matter
• Cellular respiration
• Chemical energy of food
• Cell communication
• The cell cycle
• Sexual life cycles
• The gene idea
• Locating genes
• The molecular basis of inheritance
• Genetic information
• Microbial model systems
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• Darwin’s theory
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