Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Biology Chapter 28 Section 2[1]

1,145 views

Published on

Published in: Technology, Education
  • Be the first to comment

  • Be the first to like this

Biology Chapter 28 Section 2[1]

  1. 1. Biology: Chapter 28 Section 2: Groups of Arthropods By: Adam Goetsch Period 3 3/29/09
  2. 2. Crustaceans <ul><li>Crustaceans are in the subphylum Crustacea </li></ul><ul><li>They typically have two pairs of antennae, two or three body sections, and chewing mouthparts called mandibles . </li></ul><ul><li>Body plan: </li></ul><ul><li>Cephalothorax - formed by fusion of the head with the thorax </li></ul><ul><li>Thorax –lie behind the head and houses most of internal organs </li></ul><ul><li>Abdomen – the posterior part of the body </li></ul><ul><li>Carapace – part of the exoskeleton that covers the cephalothorax </li></ul>
  3. 3. Crustaceans (continued) <ul><li>Body plan (continued): </li></ul><ul><li>Mandibles – a mouthpart adapted for biting and grinding food. </li></ul><ul><li>Gills attached to the appendages associated with the cephalothorax </li></ul><ul><li>Chelipeds – bear large claws that are modified to catch, pick up, crush, and cut food (behind the claws are four pairs walking legs). </li></ul><ul><li>Swimmerets - are flipper-like appendages used for swimming </li></ul>
  4. 5. Spiders and Their Relatives <ul><li>Horseshoe crabs, spiders, ticks, and scorpions are members of the subphylum Chelicerata . </li></ul><ul><li>Chelicerates have mouthparts called chelicerae and two body sections, and nearly all have four pairs of walking legs . </li></ul><ul><li>Body plan: </li></ul><ul><li>Chelicerae- mouthpart that contains fangs and are used to stab and paralyze prey </li></ul><ul><li>Pedipalps- longer than the chelicerae and are usually modified to grab prey </li></ul>
  5. 6. Horseshoe Crabs <ul><li>Are the oldest living arthropods </li></ul><ul><li>First appeared 600 million years ago that haven’t evolved much </li></ul><ul><li>Closest relatives are spiders, but heavily armored bodies like crabs </li></ul><ul><li>Has long tail used for movement </li></ul><ul><li>Get as big and shape of a large frying pan </li></ul>
  6. 8. Spiders <ul><li>Feeding: from small birds to other arthropods, some use webs and others stalk and pounce. </li></ul><ul><li>Spiders can’t swallow unless food is liquefied and they inject their prey with paralyzing venom. </li></ul><ul><li>When paralyzed the spider then injects digestive enzymes that break down tissues the prey’s tissues. </li></ul>
  7. 10. Mites and Ticks <ul><li>They are often parasites. </li></ul><ul><li>Chelicerae and Pedipalps are meant for digging into the host’s tissues and sucking out their blood or plant fluids </li></ul><ul><li>Pedipalps are often used to attach to the host. </li></ul><ul><li>Example of Mites: kill houseplants and major agricultural crops like cotton </li></ul><ul><li>Example of Ticks: bring serious diseases such as Rocky Mountain spotted fever or Lyme disease. </li></ul>
  8. 12. Scorpions <ul><li>Habitat: warm area such as deserts. </li></ul><ul><li>Have long segmented abdomens that carries a venomous stinger that can kill or paralyze prey. </li></ul><ul><li>Scorpions chew prey unlike spiders. </li></ul>
  9. 14. Insects and Their Relatives <ul><li>Belong to the subphylum Uniramia </li></ul><ul><li>Examples of Uniramia: centipedes, millipedes, and insects </li></ul><ul><li>Uniramians have jaws, one pair of antennae and unbranched appendages </li></ul><ul><li>Centipedes: worm- like bodies with 100 pairs of legs, class of chilopoda </li></ul><ul><li>Millipedes: worm- like bodies with double the pairs of legs and body segments then the centipedes </li></ul>

×