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Biol 11 Lesson 1 April 5 - Arthropoda (1)


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Biol 11 Lesson 1 April 5 - Arthropoda (1)

  1. 1. Phylum Arthropoda: Arthropods Chapter 28: Arthropods pp. 606-631
  2. 2. <ul><li>Biology fun facts of the day: </li></ul>No two human beings have the same fingerprint; likewise, no two spider webs are the same.
  3. 3. <ul><li>Mosquitoes dislike citronella because it irritates their feet. You're more likely to be a target for mosquitoes if you consume bananas. </li></ul>Biology fun facts of the day:
  4. 4. <ul><li>Each year, insects eat 1/3 of the Earth's food crop. </li></ul>Biology fun facts of the day:
  5. 5. <ul><li>Australian termites have been known to build mounds twenty feet high and at least 100 feet wide. </li></ul>Biology fun facts of the day:
  6. 6. Introduction to Arthropods <ul><li>Phylum Arthropoda - Latin arthro = “joint”, pod = “foot” </li></ul><ul><li>Bilateral symmetry </li></ul><ul><li>3 cell layers (ectoderm, endoderm, mesoderm) </li></ul><ul><li>Have a coelom (reduced to the excretory and reproductive systems) </li></ul><ul><li>Key features: </li></ul><ul><li>Jointed appendages </li></ul><ul><li>Exoskeleton (made of chitin) </li></ul><ul><li>Segmented body (head, thorax, abdomen segments) </li></ul><ul><ul><li>Probably evolved from segmented wormlike animals, similar to </li></ul></ul><ul><ul><li>modern annelids </li></ul></ul>
  7. 7. Subphyla of Arthropods <ul><ul><li>Subphylum Trilobita: ex: trilobites </li></ul></ul><ul><ul><li>Oldest subphylum, all extinct now, but ubiquitous for many era. </li></ul></ul><ul><ul><li>Subphylum Chelicerata: ex: spiders, scorpions, ticks, mites, horseshoe crabs, etc. </li></ul></ul><ul><ul><ul><li>Special mouthparts called chelicerae </li></ul></ul></ul><ul><ul><li>Subphylum Crustacea: ex: crabs, lobsters, shrimp, etc. </li></ul></ul><ul><ul><li>Over 35,000 species! </li></ul></ul><ul><ul><li>Subphylum Uniramia: ex: millipedes, centipedes, and all insects </li></ul></ul><ul><ul><li>Huge group! </li></ul></ul>
  8. 8. Form and Function of Arthropods <ul><ul><ul><li>Arthropods vary a lot , but share some key features: </li></ul></ul></ul><ul><ul><ul><li>Jointed appendages </li></ul></ul></ul><ul><ul><ul><li>Exoskeleton </li></ul></ul></ul><ul><ul><ul><li>Segmented body </li></ul></ul></ul><ul><ul><ul><li>Brain located in the dorsal part of the head </li></ul></ul></ul><ul><ul><ul><li>Ventral nerve cord </li></ul></ul></ul><ul><ul><ul><li>Open circulatory system powered by a single heart </li></ul></ul></ul>*3 most important features* Grasshopper diagram
  9. 9. Form and Function of Arthropods <ul><ul><ul><li>Digestive system: </li></ul></ul></ul><ul><ul><ul><li>Complete digestive tract (mouth  anus) </li></ul></ul></ul><ul><ul><ul><li>Many arthropods have specialized feeding parts </li></ul></ul></ul><ul><ul><ul><li>Every mode of feeding is seen </li></ul></ul></ul><ul><ul><ul><li>Examples: </li></ul></ul></ul><ul><ul><ul><li>Predators </li></ul></ul></ul><ul><ul><ul><li>Filter feeders </li></ul></ul></ul><ul><ul><ul><li>Parasites </li></ul></ul></ul><ul><ul><ul><li>Scavengers (detritivores) </li></ul></ul></ul><ul><ul><ul><li>Herbivores </li></ul></ul></ul><ul><ul><ul><li>etc. </li></ul></ul></ul>
  10. 10. <ul><ul><ul><li>Respiratory system: </li></ul></ul></ul><ul><ul><ul><li>1) Gills – feathery structures (ex: crustaceans) </li></ul></ul></ul><ul><ul><ul><ul><li>2) Book gills/lungs – pagelike sheets of respiratory tissue </li></ul></ul></ul></ul><ul><ul><ul><ul><li>(ex: chelicerates) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>3) Tracheae – network of tubes that carry air (ex: uniramians) </li></ul></ul></ul></ul><ul><ul><ul><li>Circulatory system: </li></ul></ul></ul><ul><ul><ul><li>Open circulatory system </li></ul></ul></ul><ul><ul><ul><li>Well-developed heart pumps blood through arteries, which branch into smaller vessels which lead to open spaces called sinuses </li></ul></ul></ul>
  11. 11. <ul><ul><ul><li>Excretory system: </li></ul></ul></ul><ul><ul><ul><li>Malpighian tubules (terrestrial arthropods) </li></ul></ul></ul><ul><ul><ul><li>Gills or green gland (aquatic arthropods) </li></ul></ul></ul><ul><ul><ul><li>Nervous system: </li></ul></ul></ul><ul><ul><ul><li>All arthropods have a brain that consists of a pair of ganglia </li></ul></ul></ul><ul><ul><ul><li>Ventral nerve cord </li></ul></ul></ul><ul><ul><ul><li>Ganglia along nerve cord </li></ul></ul></ul><ul><ul><ul><li>Many sense organs may </li></ul></ul></ul><ul><ul><ul><li>be present </li></ul></ul></ul><ul><ul><ul><li>Examples: </li></ul></ul></ul><ul><ul><ul><li>Eyes (compound or simple) </li></ul></ul></ul><ul><ul><ul><li>Antennae </li></ul></ul></ul><ul><ul><ul><li>Statocysts </li></ul></ul></ul><ul><ul><ul><li>Tympanic membrane </li></ul></ul></ul><ul><ul><ul><li>Chemoreceptors </li></ul></ul></ul>
  12. 12. <ul><ul><ul><li>Musculoskeletal system: </li></ul></ul></ul><ul><ul><ul><li>Movement only at joints </li></ul></ul></ul><ul><ul><ul><li>Muscles attached to inside of exoskeleton </li></ul></ul></ul><ul><ul><ul><li>Arthropods moult when they grow because exoskeleton won’t expand </li></ul></ul></ul>Freshly moulted crab Crab moult Cicada moult
  13. 13. Babies look like miniature adults . They increase in size as they grow older, but do not change overall form . Ex: grasshopper Eggs hatch into larvae (immature stages that do not look like adults). As larvae grow, they change shape dramatically. Ex: butterfly, bees, wasps
  14. 14. Ecology of Arthropods <ul><li>Arthropods are the bottom of the food chain (ex: copepods) </li></ul><ul><li>Pollination – co-evolution with flowering plants </li></ul><ul><li>Symbiotic relationships (ex: cleaner shrimp and fish) </li></ul><ul><li>Food source for humans (especially crustaceans) </li></ul><ul><li>Useful chemicals </li></ul><ul><li>Honey, silk </li></ul><ul><li>Disease carriers (ex: mosquitoes, mites, ticks) </li></ul><ul><li>Crop destruction, pesticides </li></ul>
  15. 15. Video – “Arthropods”
  16. 16. Homework for next class: <ul><li>Complete Phylum Arthropoda worksheet </li></ul><ul><li>Read over class notes and check out the class blog: </li></ul>
  17. 17. Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li>,182,0,0,html/No-Mosquitoes-Citronella-Candle </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>
  18. 18. Works Cited <ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>