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Arthropods BIOL 1407
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Phylum Arthropoda Cheliceriformes Myriapoda: millipedes and centipedes
Horseshoe Crabs Arachnids: spiders, scorpions, ticks, mites Myriapoda: millipedes and centipedes Hexapoda: insects and springtails Crustacea: crabs, lobsters, barnacles, etc.
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Cheliceriformes: Horseshoe Crabs
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Cheliceriformes: Arachnids
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Cheliceriformes: Arachnids
Video: Click on “Trapdoor Spider” and “An Amazing Web”
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Myriapods Millipede Centipede
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Photo Credit for Caterpillar: UNK Student, Vieques 2008
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”.
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Hexapods: Springtails
Photo Credit: Sarefo, 2005 Wikimedia Commons Video: Click on “Dancing Springtails”
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Photo Credit for Spiny Lobster: UNK Student, 2008, Vieques
Crustaceans Photo Credit for Spiny Lobster: UNK Student, 2008, Vieques
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Photo Credit for Artermia: Betsy Maxim, 2008
Crustaceans Photo Credit for Artermia: Betsy Maxim, 2008
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Characteristics of Arthropods
Bilateral symmetry Triploblastic Coelomate Photo Credit: Alvesgaspar, 2008, Wikimedia Commons
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Characteristics of Arthropods
Segmentation Chitinous Exoskeleton Photo Credit for Striped Love Beetle: Adrian Pingstone, 2005, Wikimedia Commons
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Characteristics of Arthropods
Jointed Appendages Photo Credit for Praying Mantis in Defense Posture: Tibor Duliskovich, 2007, Wikimedia Commons
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Characteristics of Arthropods
Ecdysis Video of Cicada Nymph Molting: Photo Credit: Macau500, 2004, Wikimedia Commons
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Characteristics of Arthropods
Complete Digestive System Open Circulatory System Gills or book lungs or tracheal tubes Centralized nervous system
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Metamorphosis Developmental stage in insects
Young feeding form adult reproductive form
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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
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Complete Metamorphosis
Larval stages do not resemble adults Pupa stage transformation Video: Photo Credit for Monarch Butterfly Pictures: Derek Ramsey, 2006 (adult), 2007 (caterpillar), Wikimedia Commons
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Photo Credit: André Karwath, 2005, Wikimedia Commons
Wings Photo Credit: André Karwath, 2005, Wikimedia Commons
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Complete Digestive System
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Transport Open Circulatory System Heart = Pump Vessels
Hemolymph = Fluid
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Gas Exchange Gills Book Lungs Tracheal Tubes Respiratory Pigments
Hemocyanin (crustaceans and horseshoe crabs) Photo Credit for Terebellid Polychaete: Matthias Buschmann, 2007, Wikimedia Commons
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Cellular Respiration Food is needed to provide fuel for cellular respiration Cellular respiration: ATP Use O2 Release CO2 CO2 O2
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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
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Surface-Area-to-Volume
Exchange occurs across surfaces Dependent upon surface area Folding ↑ Surface Area
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Surface-Area-to-Volume
Volume determines demand for: Materials Energy Oxygen Volume generates: Metabolic Wastes Carbon Dioxide
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Advantage of Folding Folding of internal structures increases surface area Exchange rate can meet demands of organism
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Arthropod Excretory Systems: Antennal Glands and Malpighian Tubules
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Centralized Nervous System
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The End Unless otherwise specified, all images in this presentation came from: Campbell, et al Biology, 8th ed. Pearson Benjamin Cummings.
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