Phylum annelida segmented worms
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PHYLUM ANNELIDA – segmented worms. Biology 112. Annelids. Representative species: common earthworm. Longest Earthworm found in Australia 12 feet long and thick as a coke can. Annelids. Have a coelom – fluid filled body cavity surrounded by a mesoderm (room for organs)

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PHYLUM ANNELIDA – segmented worms

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Phylum annelida segmented worms

PHYLUM ANNELIDA – segmented worms

Biology 112


Annelids

Annelids

  • Representative species: common earthworm


Phylum annelida segmented worms

  • Longest Earthworm found in Australia

  • 12 feet long and thick as a coke can


Annelids1

Annelids

  • Have a coelom – fluid filled body cavity surrounded by a mesoderm (room for organs)

  • Have a peritoneum (membrane in the coelom in which all organs are attached)

  • Have 2 sets of muscle tissue.

    • 1. body wall muscles – to move the worm and

    • 2. digestive system muscles to move food through the system


Segmented worms

Segmented Worms

  • Tube within a tube digestive tract with food passing through mouth to anus


Class oligochaeta earthworms

Class Oligochaeta: Earthworms

``It may be doubted whether there are any other animals which have played so important a part in the history of the world as the earthworm.``

-Charles Darwin, 1881

http://mypeoplepc.com/members/arbra/bbb/id19.html


Class oligochaeta earthworms1

Class Oligochaeta: Earthworms

  • 2500 species

  • Many more cell layers than flat and round worms

  • Have blood to carry gases to and from body tissues (circulation)

  • Blood in earthworms contains a red protein hemoglobin (just like in us!)

  • Have 5 hearts near the anterior end


Class oligochaeta cont

Class Oligochaeta cont…

  • More complex digestive system than other worm phyla

  • They consume dirt (food and sand particles) via mouth, pharynx, esophagus and then stores it in the crop.

  • After storage, food moves to the gizzard to be ground down, then to the intestine for digestion and absorption into the blood stream.

  • Undigested food moves out the anus


Earthworm digestion

Earthworm digestion


Class oligochaeta cont1

Class Oligochaeta cont…

  • Setae are bristles that aid in movement; each segment has 4 setae (except first and last ones)

  • Complex NS

  • Reproduce sexually

  • Hermaphrodites


Other annelids

Other ANNELIDS

  • Class Hirudinea – leeches (blood sucking parasites)


Class polychaeta marine worms

Class Polychaeta – marine worms

Family Nereididae

Planktonic Polychaete Worm

http://beyond.australianmuseum.net.au/holoplankton/holoplankton05.htm


Phylum annelida segmented worms

Terebellid Worm Larva (polychaete)

http://beyond.australianmuseum.net.au/zooplankton/zooplankton01.htm


Worm grunting charming

Worm Grunting/Charming

http://www.youtube.com/watch?v=VjRxUVLxdYI

http://www.youtube.com/watch?v=IGviTYCFksE


Summary of earthworm

Summary of Earthworm

  • Movement

    • no skeleton; two layers of muscle

    • moves by setae; 4 per segment

  • Digestion

    • has true coelem

    • order is as follows mouth, pharynx, esophagus, crop, gizzard, anus

  • Nervous system

    • simple brain, nerve cord

  • Circulation

    • 5 hearts and blood vessels

  • Respiration

    • O2 in the skin; CO2 out the skin

  • Reproduction

    • Sexually; male and female parts (hermaphroditic)

  • Excretion

    • waste through nephridia that lead to pores in the skin

  • Symmetry – bilateral symmetry


Phylum annelida segmented worms

  • Pictures for Lab

  • http://kentsimmons.uwinnipeg.ca/16cm05/16labman05/lb6pg2.htm

  • Practice Quiz - Online

  • http://www.rcs.rome.ga.us/hargett/biology/worms/wrmdia.htm


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