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Phylum Arthropoda Trilobites, Chelicerates, & Myriapods Donald Winslow 7 March 2008 Hickman et al. 2008 Ch. 19 pp 402-417 Crustaceans: Ch. 20 pp 421-429,

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Presentation on theme: "Phylum Arthropoda Trilobites, Chelicerates, & Myriapods Donald Winslow 7 March 2008 Hickman et al. 2008 Ch. 19 pp 402-417 Crustaceans: Ch. 20 pp 421-429,"— Presentation transcript:

1 Phylum Arthropoda Trilobites, Chelicerates, & Myriapods Donald Winslow 7 March 2008 Hickman et al Ch. 19 pp Crustaceans: Ch. 20 pp , Insects: Ch. 21 pp

2 Phylum Arthropoda Diversity & abundance Exoskeleton & chitin, ecdysis (molting) Somites, tagmata, jointed appendages Complex muscular system, no cilia Open circulatory system & hemocoel Mouthparts, complete digestive tract Excretory glands & Malpighian tubules

3 Arthropod respiration Body surface Gills Lungs Tracheae

4 Arthropod nervous system Cerebral ring Two ventral nerve chains Complex sensory organs –Ocelli & compound eyes –Complex behavior

5 Arthropod reproduction Usually dioecious w/ internal fertilization Oviparous or ovoviviparous or viviparous Sometimes parthenogenesis Development often by metamorphosis

6 Phylum Arthropoda Subphylum Trilobita –extinct marine animals Subphylum Myriapoda –Centipedes & millipedes Subphylum Chelicerata –Horseshoe crabs, spiders, scorpions, etc. Subphylum Crustacea—crustaceans Subphylum Hexapoda—insects

7 Subphylum Chelicerata 2 chelicerae, 2 pedipalps 8-10 legs No mandibles or antennae Class Merostomata –Subclass Xiphosurida (horseshoe crabs) Class Pycnogonida (sea spiders) Class Arachnida –Spiders, scorpions, harvestmen, ticks & mites

8 Horseshoe crabs Carapace Abdomen Telson Eyes 10 legs Book gills

9 Sea spiders Males carry egg masses w/ ovigers Class Pycnogonida

10 Class Arachnida Order Araneae –spiders Order Scorpiones –scorpions Order Opiliones –Harvestmen (Daddy long-legs) Order Acari –Ticks & mites

11 Spiders Pedicel joins cephalothorax & abdomen Book lungs and/or tracheae & spiracles Malphigian tubules & excretory glands 8 ocelli, sensory setae, poison, webs Brain, suboesophageal ganglion Sinuses Sperm from M pedipalps to F receptacle

12 Spider feeding & defense Insect predation Dangerous spiders –Black widow –Brown recluse (fiddleback)

13 Scorpions Cephalothorax Preabdomen Postabdomen with stinger

14 Order Opiliones Harvestmen or Daddy Long-legs Scavengers

15 Ticks & mites Terrestrial or aquatic, sometimes parasitic Mouthparts on capitulum Cephalothorax & abdomen fused Chiggers, scabies, Lyme disease Rocky Mountain Spotted Fever Dust mites, follicle mites

16 Myriapods Head & trunk, many somites Class Chilopoda (centipedes) –Predators, poison fangs, 2 legs per segment Class Diplopoda (millipedes) –4 legs per abdominal segment


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