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Arthropods. BIOL 1407. Phylum Arthropoda. Cheliceriformes Horseshoe Crabs Arachnids: spiders, scorpions, ticks, mites Myriapoda: millipedes and centipedes Hexapoda: insects and springtails Crustacea: crabs, lobsters, barnacles, etc. Cheliceriformes: Horseshoe Crabs.

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BIOL 1407

phylum arthropoda
Phylum Arthropoda
  • Cheliceriformes
    • Horseshoe Crabs
    • Arachnids: spiders, scorpions, ticks, mites
  • Myriapoda: millipedes and centipedes
  • Hexapoda: insects and springtails
  • Crustacea: crabs, lobsters, barnacles, etc.
cheliceriformes arachnids6
Cheliceriformes: Arachnids

Video: Click on “Trapdoor Spider” and “An Amazing Web”


Millipede Centipede

hexapods insects
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”.

hexapods springtails
Hexapods: Springtails

Photo Credit: Sarefo, 2005 Wikimedia Commons

Video: Click on “Dancing Springtails”


Photo Credit for Spiny Lobster: UNK Student, 2008, Vieques


Photo Credit for Artermia: Betsy Maxim, 2008

characteristics of arthropods
Characteristics of Arthropods
  • Bilateral symmetry
  • Triploblastic
  • Coelomate
  • Photo Credit: Alvesgaspar, 2008, Wikimedia Commons
characteristics of arthropods13
Characteristics of Arthropods
  • Segmentation
  • Chitinous Exoskeleton
  • Photo Credit for Striped Love Beetle: Adrian Pingstone, 2005, Wikimedia Commons
characteristics of arthropods14
Characteristics of Arthropods
  • Jointed Appendages
  • Photo Credit for Praying Mantis in Defense Posture: Tibor Duliskovich, 2007, Wikimedia Commons
characteristics of arthropods15
Characteristics of Arthropods
  • Ecdysis
  • Video of Cicada Nymph Molting:
  • Photo Credit: Macau500, 2004, Wikimedia Commons
characteristics of arthropods16
Characteristics of Arthropods
  • Complete Digestive System
  • Open Circulatory System
  • Gills or book lungs or tracheal tubes
  • Centralized nervous system
  • Developmental stage in insects
  • Young feeding form  adult reproductive form
incomplete metamorphosis
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
complete metamorphosis
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

Photo Credit: André Karwath, 2005, Wikimedia Commons

  • Open Circulatory System
  • Heart = Pump
  • Vessels
  • Hemolymph = Fluid
gas exchange
Gas Exchange
  • Gills
  • Book Lungs
  • Tracheal Tubes
  • Respiratory Pigments
    • Hemocyanin (crustaceans and horseshoe crabs)
    • Photo Credit for Terebellid Polychaete: Matthias Buschmann, 2007, Wikimedia Commons
cellular respiration
Cellular Respiration
  • Food is needed to provide fuel for cellular respiration
  • Cellular respiration:
    • ATP
    • Use O2
    • Release CO2



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
surface area to volume31
  • Exchange occurs across surfaces
  • Dependent upon surface area
  • Folding ↑ Surface Area
surface area to volume32
  • Volume determines demand for:
    • Materials
    • Energy
    • Oxygen
  • Volume generates:
    • Metabolic Wastes
    • Carbon Dioxide
advantage of folding
Advantage of Folding
  • Folding of internal structures increases surface area
  • Exchange rate can meet demands of organism
the end

The End

Unless otherwise specified, all images in this presentation came from:

Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.