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Arthropods

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Arthropods

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  1. Arthropods BIOL 1407

  2. Phylum Arthropoda • Cheliceriformes • Horseshoe Crabs • Arachnids: spiders, scorpions, ticks, mites • Myriapoda: millipedes and centipedes • Hexapoda: insects and springtails • Crustacea: crabs, lobsters, barnacles, etc.

  3. Cheliceriformes: Horseshoe Crabs

  4. Cheliceriformes: Arachnids

  5. Cheliceriformes: Arachnids Video: Click on “Trapdoor Spider” and “An Amazing Web” http://www.bbc.co.uk/sn/tvradio/programmes/lifeintheundergrowth/video.shtml

  6. Myriapods Millipede Centipede

  7. Hexapods: Insects Photo Credit for Caterpillar: UNK Student, Vieques 2008 Videos: Click on “Titan Beetle”, “Moth and Lantern Bug”, “Feather-Legged Bug”, “Bot Flies”, “Giant Asiatic Honeybees”, and “Mangrove Ants”. http://www.bbc.co.uk/sn/tvradio/programmes/lifeintheundergrowth/video.shtml

  8. Hexapods: Springtails Photo Credit: Sarefo, 2005 Wikimedia Commons Video: Click on “Dancing Springtails” http://www.bbc.co.uk/sn/tvradio/programmes/lifeintheundergrowth/video.shtml

  9. Crustaceans Photo Credit for Spiny Lobster: UNK Student, 2008, Vieques

  10. Crustaceans Photo Credit for Artermia: Betsy Maxim, 2008

  11. Characteristics of Arthropods • Bilateral symmetry • Triploblastic • Coelomate • Photo Credit: Alvesgaspar, 2008, Wikimedia Commons

  12. Characteristics of Arthropods • Segmentation • Chitinous Exoskeleton • Photo Credit for Striped Love Beetle: Adrian Pingstone, 2005, Wikimedia Commons

  13. Characteristics of Arthropods • Jointed Appendages • Photo Credit for Praying Mantis in Defense Posture: Tibor Duliskovich, 2007, Wikimedia Commons

  14. Characteristics of Arthropods • Ecdysis • Video of Cicada Nymph Molting:http://www.youtube.com/watch?v=go4MqVq9HVM • Photo Credit: Macau500, 2004, Wikimedia Commons

  15. Characteristics of Arthropods • Complete Digestive System • Open Circulatory System • Gills or book lungs or tracheal tubes • Centralized nervous system

  16. Metamorphosis • Developmental stage in insects • Young feeding form  adult reproductive form

  17. Incomplete Metamorphosis • Young resemble adults • Smaller with different proportions • Photo Credit for Eurydema oleraceum nymph: James K. Lindsey, 2007, Wikimedia Commons • Photo Credit for Eurydema oleraceum adult: Guido Gerding, 2006, Wikimedia Commons

  18. Complete Metamorphosis • Larval stages do not resemble adults • Pupa stage  transformation • Video: http://www.youtube.com/watch?v=GTUgUEpqBrA&feature=related • Photo Credit for Monarch Butterfly Pictures: Derek Ramsey, 2006 (adult), 2007 (caterpillar), Wikimedia Commons

  19. Wings Photo Credit: André Karwath, 2005, Wikimedia Commons

  20. Complete Digestive System

  21. Transport • Open Circulatory System • Heart = Pump • Vessels • Hemolymph = Fluid

  22. Gas Exchange • Gills • Book Lungs • Tracheal Tubes • Respiratory Pigments • Hemocyanin (crustaceans and horseshoe crabs) • Photo Credit for Terebellid Polychaete: Matthias Buschmann, 2007, Wikimedia Commons

  23. Cellular Respiration • Food is needed to provide fuel for cellular respiration • Cellular respiration: • ATP • Use O2 • Release CO2 CO2 O2

  24. Surface-Area-to-Volume • As body size ↑, Surface Area increases more slowly than Volume increases • Large bodies have smaller surface-area-to-volume ratio than small bodies

  25. Surface-Area-to-Volume • Exchange occurs across surfaces • Dependent upon surface area • Folding ↑ Surface Area

  26. Surface-Area-to-Volume • Volume determines demand for: • Materials • Energy • Oxygen • Volume generates: • Metabolic Wastes • Carbon Dioxide

  27. Advantage of Folding • Folding of internal structures increases surface area • Exchange rate can meet demands of organism

  28. Arthropod Excretory Systems: Antennal Glands and Malpighian Tubules

  29. Centralized Nervous System

  30. The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.