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Rotifers

Rotifers . Jasira Ziglar Kenneth Cortavarria . General Information. Rotifers are known as Phylum rotifera They feed on algae and plankton Rotifers are filter feeders 2200 different species of rotifers have been discovered. Habitat.

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Rotifers

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  1. Rotifers Jasira Ziglar Kenneth Cortavarria

  2. General Information • Rotifers are known as Phylum rotifera • They feed on algae and plankton • Rotifers are filter feeders • 2200 different species of rotifers have been discovered

  3. Habitat Rotifers need to live in water to survive or very damp soil Different rotifers are found in salt water or fresh water

  4. Life Cycle • Most Rotifers reproduce using parthenogenesis • Parthenogenesis is when a female undergoes mitosis and the eggs remain dormant until conditions in the environment are favorable again

  5. Importance to Humans Rotifers are important to humans because they eat microorganisms smaller than them and keep bodies of water clean by eliminating animal matter

  6. Euchlanis

  7. Euchlanis • The Brown region is the stomach • On its sides a pair of long bundled muscles are barely visible • Lives in freshwater, generally found in lakes and ponds

  8. Keratella

  9. Keratella • Found in almost every body of water • Very common • Able to survive with low amounts of food due to its small size • Sexually reproduces, female undergoes meiosis and creates eggs, some will hatch into males. These males undergo mitosis to create sperm to fertilize an egg

  10. Conochilus

  11. Conochilus • Found in saltwater • This group of rotifers form a spinning colony • Feet are bound together in a small mass of jelly

  12. External Anatomy • They range in size from 50um-2mm, and are smaller than many protists • They are multi cellular • There is cilia that is at the head of the rotifer • They have a “foot” that allows them to stick to surfaces

  13. Internal Anatomy • Rotifers have an alimentary canal: a digestive tube with a separate mouth and anus • There are jaws in the pharnyx which are called trophi, that are used to grind up food • There is a small brain and nerves that extend through the body • Rotifers have up to 5 eyes

  14. Internal Anatomy (cont.) • The internal organs are in a body cavity called the pseudocoelom • In the pseudocoelom there is fluid that serves as a hydrostatic skeleton (fluid that us held under pressure in a closed body compartment)

  15. Symmetry Rotifers have bilateral symmetry

  16. Bibiography • Microscopy-UK Micscape Microscopy and Microscopes Magazine. (n.d.). Microscopy-UK full menu of microscopy and microscopes on the web. Retrieved February 9, 2011, from http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/rotidr.html • Microscopy-UK Micscape Microscopy and Microscopes Magazine. (n.d.). Microscopy-UK full menu of microscopy and microscopes on the web. Retrieved February 9, 2011, from http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artsep98/conochil.html • Rotifers. (n.d.). FCPS Home Page Redirect Page. Retrieved February 9, 2011, from http://www.fcps.edu/islandcreekes/ecology/rotifer.htm • Wallace, R. (n.d.). Rotifers: Exquisite Metazoans — Integr. Comp. Biol. . Oxford Journals | Life Sciences | Integrative and Comparative Biology. Retrieved February 9, 2011, from http://icb.oxfordjournals.org/content/42/3/660.full • Zooplankton of the Great Lakes. (n.d.). College of Science and Technology - Central Michigan University. Retrieved February 9, 2011, from http://www.cst.cmich.edu/users/mcnau1as/zooplankton%20web/keratella/ker.html

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