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Chapter 23

Chapter 23. Animals: The Invertebrates. Characteristics of Animals. Multicellular . Cells are usually arranged in organs or organ systems Heterotrophs Require oxygen to perform aerobic respiration. Most are motile at some point in the life cycle

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Chapter 23

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  1. Chapter 23 Animals: The Invertebrates

  2. Characteristics of Animals • Multicellular. Cells are usually arranged in organs or organ systems • Heterotrophs • Require oxygen to perform aerobic respiration

  3. Most are motile at some point in the life cycle • Life cycle includes some sort of embryonic development • Mostly reproduce sexually (some asexually)

  4. Radial Symmetry • No clear front or rear • Body parts are arranged around a central axis

  5. Bilateral Symmetry • Organism is the same on either side of one plane of symmetry • Has a true front and rear

  6. Phylum Porifera - Sponges • Animals with no symmetry, no tissues or organs. • Range in size from tiny (like a fingernail) to large enough to sit in • Engulf particles to feed (phagocytosis) • Can reproduce sexually with a larva or asexually by fragmentation

  7. Sponges

  8. Phylum Cnidaria • Jellyfish, sea anemones, coral • All are aquatic – most are ocean dwelling • Have tissues • Have nematocysts – “stinging darts” • Reproduce sexually • Have a nerve net for stimulation

  9. Jellyfish, Corals, Hydra

  10. Phylum Platyhelminthes - Flatworms • Turbellarians, Flukes, and Tapeworms • Have a simple digestive system – absorb food from a host • Body is flattened • Most are hermaphrodites, but will reproduce sexually with another flatworm

  11. Flatworms Sea slugs

  12. Phylum Nematoda - Roundworms • Thrive nearly everywhere • Have a complete digestive system • Have a partial body cavity where reproductive organs are found • Most are free-living, with few parasitic species

  13. Roundworms Ancyclostoma duodenale (hookworm)

  14. Phylum Annelida – Segmented Worms • Segmented worms – segments are repeating body sections • Many have setae (small hair like bristles) to help them move through soil • Have a complete gut, rudimentary brain (with nerve cord), and circulatory system

  15. Earthworms and Leeches

  16. Phylum Mollusca • Octopus, squid, clams, scallops, snails, slugs, oysters • Most have a hard shell with a soft body • Have well developed organ systems • Have a brain

  17. Octopus, Squid, Snail, Oyster

  18. Phylum Arthropoda(I accidently left this off – add it!) • Insects, crustaceans, arachnids • Hardened exoskeletons • Jointed appendages • Respiratory Structures • Sensory Structures • Division of labor

  19. Class Arachnida

  20. Class Insecta

  21. Class Crustacea

  22. Phylum Echinodermata • Sea urchins, star fish • Have spines or plates of calcium carbonate • Well developed skeleton • No brain, but nervous system is present • Water vascular system to deliver water to tube feet for movement

  23. Sea Stars, Sea Urchins Class Asteroidea

  24. Phylum Chordata • Includes some invertebrates and ALL vertebrates • Subphylum Vertebrata – all vertebrates are in this subphylum

  25. Works Cited • http://www.okc.cc.ok.us/biologylabs/Documents/Animals/Symmetry.htm • http://trc.ucdavis.edu/biosci10v/bis10v/week9/sponge.gif • http://www.okc.cc.ok.us/biologylabs/Images/Animal_Images/Sponge_copy.JPG • http://www.aloha.com/~lifeguards/jellie75.jpg • http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20102/Bio%20102%20lectures/animal%20diversity/lower%20invertebrates/hydra_l.s._X_40.jpg • http://www.seaslugforum.net/images/flatworm.jpg • http://waynesword.palomar.edu/images/taworm4b.jpg • http://images.google.com/imgres?imgurl=http://biology.nebrwesleyan.edu/Courses/Labs/Biology_of_Animals/ZooLab10/Ancylostoma_male_10X.jpg&imgrefurl • http://www.biology.iastate.edu/Courses/201L/Annelida/42%20whole%20worm.JPG • http://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Leech_blutegel.jpg/300px-Leech_blutegel.jpg • http://www.sheppardsoftware.com/images/animalpics/mollusk1.jpg • http://webpages.charter.net/teefile/biognomen/photo/Mollusca.jpeg • http://www.bioquip.com/prod_images/5389L-001-Class%20Insecta%20front.jpg • http://www.troutnut.com/im_regspec/picture_1170_small.jpg • http://www.insectzoo.msstate.edu/Images/7812793b.jpg • http://webpages.charter.net/teefile/biognomen/photo/scorpion.jpeg • http://www.emporia.edu/biosci/invert/lab6/limulusad.jpg • http://www.earthlife.net/inverts/images/echinoderms/arbacia.jpg • http://www.museums.org.za/bio/images/mb/mb0556m.jpg • http://3.bp.blogspot.com/_3tLvZgf7WyA/SkqCO0e_L1I/AAAAAAAAAgo/8fUbEjGyTuU/s400/roach8.jpg

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