Biol 11 Lesson 3 Mar 8 - Ch. 27 Annelida

  • 1,743 views
Uploaded on

Ch 27 Mollusks and Annelids …

Ch 27 Mollusks and Annelids
pp. 594-600

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
No Downloads

Views

Total Views
1,743
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
40
Comments
0
Likes
1

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Homework from last class:
    • Complete squid lab handout and analysis questions
    • Read Ch. 27-2 Annelids
    • Read over class notes and check out the class blog: http://msoonscience.blogspot.com/
  • 2. Phylum Annelida: Annelids Chapter 27: Mollusks and Annelids pp. 594-600
  • 3. Top 10 Bloodsuckers: Leech
    • http://www.youtube.com/watch?v=jMci6O--1wY
  • 4. Introduction to Annelids
    • Phylum Annelida – Latin annellus = “little ring”
    • Segmented worms
    • Bilateral symmetry
    • 3 cell layers (ectoderm, endoderm, mesoderm)
    • Simplest phylum to have a coelom (fluid-filled cavity lined by mesoderm cells)
    • Annelids are considered to be related to mollusks because their larvae are similar (trochophore larvae) and they share similar developmental patterns
      • Mollusks and annelids likely share a common ancestor (possibly worm-like)
  • 5.
    • Comparative cross-sections:
    • Nematode Annelid
    Coelom Pseudocoelom (fluid-filled space) Coelom (fluid-filled space totally surrounded by mesoderm) endoderm mesoderm ectoderm
  • 6.
    • Most animals have tissues that are derived from 3 embryonic cell layers:
    • Ectoderm: develops into epidermis, ie. skin
    • Mesoderm: develops into muscle tissue and mesentary
    • Endoderm: develops into the tissue of the digestive tract ie. gut
    Coelom ectoderm mesoderm endoderm
  • 7.
    • The coelom is an important evolutionary advancement:
    • Separates the intestine from the muscles of the body wall by allowing for independent movement
    • Provides a space for a true circulatory system to develop
    • Coelomic fluid circulates O 2 /CO 2 , nutrients, and waste
    • * Mollusks also have a coelom but theirs surrounds only the heart not the entire intestine and internal organs.*
    Coelom
  • 8. Classes of Annelids
    • 1) Class Polychaeta
      • Bristly marine worms
      • Have paired appendages on each segment
      • Example members: sea mouse (p. 599)
      • 2) Class Oligochaeta
      • Earthworms
      • Terrestrial; fertilize and aerate soil (produce “castings”
      • Example members: earthworms, tubifex worms
  • 9. Classes of Annelids
    • 3) Class Hirudinea
    • Leeches
    • Mostly freshwater
    • Have suckers at both ends; anticoagulants and anaesthetics to help suck blood
    • Example members: leeches
  • 10. Form and Function of Annelids
        • earthworm = representative annelid
        • Digestive system:
        • Complete digestive tract (mouth  anus)
          • Mouth, pharynx, esophagus, crop (for storage), gizzard (for grinding), intestine, anus
    Earthworm digestive system
  • 11.
        • Respiratory system:
        • Some aquatic ones have gills
        • Many (e.g. earthworms) exchange O 2 /CO 2 through the skin
  • 12.
        • Circulatory system:
        • Closed circulatory system – blood is always contained inside vessels
        • Have primitive “hearts” (earthworms have 5) to pump blood
        • Excretory system:
        • Nephridia (primitive kidneys) in each segment remove metabolic waste (nitrogen-containing wastes like NH 3 )
  • 13.
        • Nervous system:
        • Fairly well-developed
        • Have a small brain, eyes or eyespots, statocysts, sensory tentacles, chemical receptors
  • 14.
        • Musculoskeletal system:
        • Longitudinal and circular muscles work together to propel worm (peristalsis)
        • Bristles present on ventral side for grip
  • 15.  
  • 16. Ecology of Annelids
    • Earthworms are very important on land – they condition soil in 2 ways:
      • Add nitrogen to the soil (in their “castings”)
      • They aerate the soil so oxygen gets in
      • In ocean, annelids are often the bottom of food web.
  • 17. Activity – Song, Story, Rap, or Poem! Serenade me!!
  • 18. Activity Instructions:
    • With a partner or working individually, create a song, story, rap, or poem that incorporates 10 characteristics or structural attributes and functions about Phylum Annelida.
    • Have fun with it!
    • *Note: If you choose a song, you must write down the tune that goes with your song. *
  • 19. Homework for next class:
    • Finish your Phylum Annelida song, story, rap, or poem (must submit with evaluation sheet)
    • Complete Annelida question worksheet
    • Complete earthworm colouring diagram
      • You must include a key. Example:
            • Excretory system
            • Circulatory system
    • Read over class notes and check out the class blog: http://msoonscience.blogspot.com/
  • 20. Works Cited
    • Images taken from the following sources:
    • http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0019261.html
    • http://picasaweb.google.com/lh/photo/M8MUN49EaXJGCYd0AJEgWQ
    • http://www.biologyjunction.com/earthworm_dissection.htm
    • http://www.myfishfinder.com/fishing_forum/index.php?topic=5973.0
    • http://flyguys.net/Leech.html
    • http://commons.wikimedia.org/wiki/File:Annelida_Hirudinea_Leech_3.JPG
    • http://universe-review.ca/R10-33-anatomy.htm
  • 21. Works Cited
    • http://hubpages.com/hub/EarthwormAfraidSalts
    • http://www.tutorvista.com/biology/earth-worm-nervous-system
    • http://robinsonlibrary.com/science/zoology/invertebrates/annelida/oligochaeta/earthworm.htm
    • http://www.tutornext.com/help/locomotion-in-earthworm
    • http://www.neighborhoodnotes.com/news/2010/11/vermicultureworm_ranching_is_all_the_rage/
    • http://producersconsumers.wikispaces.com/11
    • http://waynesword.palomar.edu/trnov01.htm
    • http://www.fotosearch.com/clip-art/earthworm.html