Phylum annelida segmented worms
1 / 19

- PowerPoint PPT Presentation

  • Uploaded on

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)

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about '' - kirra

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


  • Representative species: common earthworm

Phylum annelida segmented worms


  • 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

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

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

  • Class Hirudinea – leeches (blood sucking parasites)

Class polychaeta marine worms
Class Polychaeta – marine worms

Family Nereididae

Planktonic Polychaete Worm

Phylum annelida segmented worms

Terebellid Worm Larva (polychaete)

Worm grunting charming
Worm Grunting/Charming

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


  • Practice Quiz - Online