1. Arthropods
BIOL 1407

3. 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.

4. Cheliceriformes: Horseshoe Crabs

5. Cheliceriformes: Arachnids

6. Cheliceriformes: Arachnids
Video: Click on “Trapdoor Spider” and “An Amazing Web”

7. Myriapods
Millipede Centipede

8. 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”.

9. Hexapods: Springtails
Photo Credit: Sarefo, 2005 Wikimedia Commons
Video: Click on “Dancing Springtails”

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

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

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

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

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

15. Characteristics of Arthropods
Ecdysis
Video of Cicada Nymph Molting:
Photo Credit: Macau500, 2004, Wikimedia Commons

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

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

20. 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

21. 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

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

23. Complete Digestive System

24. Transport Open Circulatory System Heart = Pump Vessels
Hemolymph = Fluid

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

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

30. 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

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

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

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

34. Arthropod Excretory Systems: Antennal Glands and Malpighian Tubules

35. Centralized Nervous System

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