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Annelids. Segmented worms . Albert Gordon Jacob Cole. Jacob Cole. http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633070.jpg. Types. Oligochaeta: Earthworms and other terrestrial worms; chaetae (chitin bristles), no parapodia

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annelids

Annelids

Segmented worms.

Albert Gordon

Jacob Cole

Jacob Cole

http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633070.jpg

slide2

Types

  • Oligochaeta: Earthworms and other terrestrial worms; chaetae (chitin bristles), no parapodia
  • Polychaeta: Marine worms that are free or tube living; parapodia
  • Hirudinea: Leeches and other flat annelids with no chaetae

http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633073.jpg

Albert Gordon

Jacob Cole

body formation
Body Formation
  • Annelids are Coelmates which means that they have a fluid filled cavity completely surrounded by tissue
  • In mature form, annelids are long with ridged segments in their skin.
  • Range from 1mm to 3m in length

Albert Gordon

http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633070.jpg

body formation cont
Body Formation (cont)
  • Bilateral Symmetry
  • Hydrostatic skeleton; supported by septa between segments

Jacob Cole

nervous system
Nervous System
  • Cerebral Ganglia
  • That’s it. They’re not exactly intellectuals…

Jacob Cole

digestive excretory
Digestive & Excretory
  • Has mouth and anus; a digestive tract extends along length of worm.
  • Metanephridia (same neph as in nephron of the kidneys in humans) parallel to worm’s digestive tract filter blood and coelomic fluid. Waste secreted through

exterior pores

Albert Gordon

Jacob Cole

http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633070.jpg

circulatory
Circulatory
  • Closed circulatory system
  • Many hearts
  • Blood vessels wrap around the digestive tract in loops

Albert Gordon

reproductive system
Reproductive System
  • Cross-fertilizing hermaphrodites
  • Secrete mucous cocoon in which embryos develop
  • Some can also reproduce asexually via fragmentation

Jacob Cole

more facts
More Facts
  • Earthworms are beneficial to farmers because castings (egested materials) are valuable as a fertilizer and help recycle soil.
  • Hirudinea or leeches are still used in medicine today to neatly drain blood from wounds

Albert Gordon

Jacob Cole

http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633074.jpg

quiz questions
Quiz Questions
  • Annelids are:
    • pseudocoelomates
    • coelomates
    • acoelomates
  • Annelids live in all of the following environments EXCEPT:
    • seawater
    • freshwater
    • damp soil
    • inside the human body

Jacob Cole

quiz questions continued
Quiz Questions Continued
  • Which of the following do NOT have a closed circulatory system (select all that apply):
    • Nematoda
    • Annelida
    • Cephalopods
    • Arthropods
  • Annelids can reproduce by which of the following processes?
    • Self-fertilization
    • Cross-fertilization
    • Fragmentation
    • All of the above

Jacob Cole

citations
Citations
  • All information from Chapters 32 and 33 of Textbook (Biology 7th Edition, Campbell, Reese)