Euglenid
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== References == | == References == | ||
| - | * [http:// | + | * [http://library.thinkquest.org/27819/ch7_4.shtml] The Guide of Euglenas |
| - | * [http://www. | + | * [http://www.tolweb.org/Euglenida/97461] Brian S. Leander. euglenids or euglenoids. Version 11 September 2008. |
* [http://www.example.com link title] Author. Publisher. | * [http://www.example.com link title] Author. Publisher. | ||
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| Euglenid |
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Contents |
Introduction
Euglenids are marine and freshwater green or colorless flagellate organism.
Around 1,400 species of euglenids have been discovered so far, and it is possible that at least twice that many are waiting to be discovered. The colorless Euglenids usually feed on bacteria or smaller flagellates.There are some species of Euglena that are bright red, this is because of the pigment called astaxanthin. Euglena can live as an autotroph or mesotroph when it is put in darkness for any amount time, but when re introduced to light will get its chlorophyl back. One important structure different to euglenas can be known as the stigma, a organelle that is sensitive to light. The euglena moves by using it flagellum toward light by using the stigma. Now the euglena can find the light it needs for photosynthesis.
Anatomy
Euglenids are either green colored or colorless. The outer part of a cell consists of a hard layer called a pellicle. Some euglenids have chloroplasts that contain the photosynthetic pigments chlorophyll a and b. The other ones are heterotrophic so they are able to absorb their food and ingest it. Most euglenids have two flagella that flow out from their bodies. They come out of flagellar pockets. Some have more then two, and some have barley any at all. There is mostly a leading flagellum, which is usually beats only at its tip, and one behind, which might be attached to the side of the cell. Euglenids also have contractile vacuoles, which means that they can force out water, which is diffused into the cell; if they don't do that they could burst from all the excess water. They also have things called pyrenoid bodies, this means it can store starch, it can also be used as a spare energy source. [1]
Reproduction
Sexual reproduction does not exist to the Euglenids. They have not been known to reproduce sexually. Asexual reproduction occurs by mitosis then comes cytokinesis. Euglenids reproduce asexually by dividing longitudinally. They said that the process of this can be sloppy because of the movement in the chromosomes when it is being divided is irregular than other cells which have mitosis.
Ecology
Euglenids are commonly found in freshwater. They live in between grains of sand and the interface between mud and the water column. It can be found in almost anywhere where there is fresh or brackish water. It lives the best where there is a lot of rich organic waste. There are between 800-1000 different species of Euglena in the British Isles.
Gallery
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References
- [2] The Guide of Euglenas
- [3] Brian S. Leander. euglenids or euglenoids. Version 11 September 2008.
- link title Author. Publisher.
See Also
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