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Unit 8 Chapter 28 Arthropods

Unit 8 Chapter 28 Arthropods. What is an Arthropod?. Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages = body outgrowths. What is an Arthropod?. Arthropods must molt (shed exoskeleton periodically)

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Unit 8 Chapter 28 Arthropods

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  1. Unit 8Chapter 28Arthropods

  2. What is an Arthropod? • Bilaterally symmetrical, segmented coelomates • Segmented body, exoskeleton & jointed appendages • Appendages = body outgrowths

  3. What is an Arthropod? • Arthropods must molt (shed exoskeleton periodically) • Arthropods have variety of respiration types: gills, tracheal tubes & book lungs • Arthropods have complex digestive and excretory systems: • Mandibles (jaws) are used to classify arthropods

  4. What is an Arthropod? • Arthropods have well-developed senses: • Pheromones = chemical odor signals given off by animals (detected by others) • Compound eyes = visual structure with many lenses • Simple eye = visual structure with only one lens for detecting light

  5. What is an Arthropod? • Arthropods reproduce sexually: • Some are hermaphroditic, most have internal fertilization • A few have parthenogenesis = new individuals develop from unfertilized eggs Ex: social insects, such as bees, ants & wasps

  6. Diversity of Arthropods • Arachnids • Includes spiders, scorpions, ticks & mites (chiggers) • Two body segments & six pairs of jointed appendages, including 8 legs, 2 chelicerae (fangs) and 2 pedipalps (sensors)

  7. Diversity of Arthropods • Crustceans • Includes crabs, lobsters, shrimp, crayfish, pill bugs & barnacles • Two body segments & 2 pair of antennae, 5 pair of legs, and numerous “jaw feet”

  8. Diversity of Arthropods • Millipedes & Centipedes • Many body segments and paired legs • Millipedes are herbivorous, while centipedes are carnivores • Horseshoe Crabs • These “living fossils” have remained unchanged for 200 million years

  9. Diversity of Arthropods • Insects…Most successful class in terms of diversity • Includes beetles, butterflies, ants & bees, flies & mosquitoes, and many others • Three body segments, 3 pair of legs, one pair of antennae, and wings

  10. Metamorphosis • Series of changes in body shape and form during life history • Incomplete M: 3 stages including nymph (smaller, immature version of adult)

  11. CompleteM: 4 stages including larva (wormlike creature which eats and grows) and pupa (enclosed structure that changes into adult form)

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