By John Cashman and Jason Holthaus

1
Annelids

• By John Cashman and Jason Holthaus

2
What is it?

• Latin word anellis which means ring
• Annelids are ringed worms
• Differentiated by their segments
• Length lt1 inch and upwards of 11 feet
• Uses chaetae (small bristles) to move

3
What are Chaetae?

• Voice Thread!)
• A voice thread link that will help you to
  understand more about what the chaetae is and its
  function

4
Habitat

• Oceans
• Fresh Water
• Land

5
Importance to Humans

• Earthworms are commonly sold as bait
• The same goes with leeches
• Earthworms are also do great things for the soil
  in gardens
• Leeches saliva may someday also be used to
  prevent blood clots in humans

6
Food Source

• Heterotrophic creatures (require organic
  substances)
• Earthworms ingest soil and extract nutrients from
  it
• Leeches are predators that usually swallow their
  prey but sometimes just suck the blood
• Bristle worms move their bristles and trap
  particles to ingest

7
How Theyre Unique

• All have segmented bodies
• Bodies are sealed with a wall or septa
• Each segment contains separate body parts
• They have evolved to be more adaptable to their
  environment

8
Polychaete

• Lives in marine habitat
• Over 10,000 different species
• Ex. Bristle Worms
• Polychaeta is Latin for many bristles

9
(No Transcript)
10
Oligochaeta

• Lives on land
• 3,500 species
• Also live in swamps and marshes
• Oligochaeta means "few-bristled
• Ex. Earthworms

11
(No Transcript)
12
Hiruindea

• Around 500 species
• Live on land, saltwater, and freshwater
• Some suck blood, but many don't
• Have little to no chaetae
• Ex. Leech

13
(No Transcript)
14
Supporting Their Shape

• Annelids use their strong muscles to support
  their shape
• They are an invertebrate meaning they have no
  bones
• Their ring-like muscles help them to support
  their shape

15
Respiration

• Oxygen is diffused through body surface
• Then it is used by the capillaries
• These are very close to the surface and make it
  easier to use the oxygen
• Carbon Dioxide is then diffused back out through
  the skin

16
Reproduction

• Some Annelids use asexual reproduction
• This means they can produce offspring by breaking
  off part of their body
• Some are also hermaphrodites
• This means they have characteristics of both
  sexes
• Many though have either male or female and
  require a partner to reproduce
• They develop segment by segment until adulthood

17
Nervous System

• Very primitive brain by the mouth
• They have nerve cords traveling the length of
  their bodies
• Sensory Organs
• Eyes
• Taste buds
• Tactical Tentacles
• Statocysts

18
Circulatory System

• Annelids have a closed circulatory system
• Ring vessels function as small hearts
• Blood moves to the head through a contractile
  vessel
• The two main vessels are the dorsal and ventral
  blood vessels

19
Excretory System

• Central unit is the Nephridia
• There are different types of Nephridia for
  different types of Annelids
• The Protonephridia are joined to a duct that
  flushes out of the subject
• The Metanephridia contain cilia and open to the
  outside of the subject

20
Digestive System

• One long digestive tract
• Food is stored in the crop
• Ground up by the gizzard
• They have unsegmented guts.
• Also have separate pharynx and stomach

21
Examples

• Earthworms
• Bristle Worms
• Leeches
• Lug Worms
• Bamboo Worms
• And thousands more

22
Basic Annelid Diagram
23
Works Cited

• Flourence, Wayne K. "Annelida (Segmented Worms,
  Including Earthworms, Leeches and Polychaetes)."
  Biodiversity Explorer. 24 May 2007. 02 Apr. 2008
  lthttp//www.biodiversityexplorer.org/mm/annelids/gt
  .
• Miller, Kenneth R., and Joseph Levine. Biology
  the Living Science. Needham Prentice Hall, 1998.
  447-452.
• Myer, Phil. "Phylum Annelida." Animal Diversity
  Web. 2001. University of Michigan Museum of
  Zoology. 02 Apr. 2008 lt http//animaldiversity.um
  mz.umich.edu. Annelida.htmlgt.
• Parker, Steve. Nematodes, Leeches Other Worms.
  Minneapolis Compass Point Books, 2006. 18-21.
• Ramel, Gordon. "The Phylum Annelida." Earthlife.
  7 Jan. 2008. Earthlife Web. 1 Apr. 2008
  lthttp//www.earthlife.net/inverts/annelida.htmlgt.
• Rouse, Greg W. "Annelida." Tree of Life. 07 Aug.
  2002. Australian Research Council.1 Apr. 2008
  lthttp//www.tolweb.org/Annelidagt.
• Russel, Bruce J. "Branches on the Tree of Life
  Annelids." Bio Media Associates. 2000. 02 Apr.
  2008 lthttp//ebiomedia.com/prod/BOanelids.htmlgt.