File:Paramecium.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:46, 31 May 2005		751 × 738 (186 KB)	Luis Fernández García	''Paramecium aurelia''. Optical microscope Source: English Wikipedia (http://en.wikipedia.org/wiki/Image:Paramecium.jpg)

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Hello everybody,

may I introduce: Paramecium caudatum.

This protozoon is known to me with its full name. If i just wrote "ciliate" in my previous postings it was just to help out; protozoa, especially ciliates, are sometimes hard to identify, and I just write "ciliate" in these cases.

This one, however, has so many distinctive features that it is easy to identify. Moreover, Paramecium caudatum (which even has a common german name which would be about "houseshoe animal" in english) is the darling of all protozoologists and microscopers. It hardly ever feeds on algae but on bacteria which makes its body structure transparent; the bacteria diet also makes it easily hatchable if you know how to supply tasty bacteria (e-mail me in case you are interested in hatching Paramecium; I'll tell you how).

Look at the big dark-grey oval in the lower middle of Paramecium; this is the nucleus where the genetic information is stored. If you look close you will see a darker-grey spot in the middle of the nucleus; this is the nucleolus, a sub-nucleus which, as far as I know, comes into play when sexual reproduction takes place. The banana-shaped, dark-grey zone in the upper middle is the mouth; the bacteria are inserted here by specialized cilia.

You can also see two big bright bubbles at the bottom side of Paramecium; these are the excretion organs called "contractile vacuoles". The waste liquids are delivered there by small channels radially attached to the vacuole; you can guess them when you watch the 5 or 6 bright spots round the lower one of the two vacuoles. Please keep that in mind if you watch my further postings because I have much better shots of that. If you watch live Paramecia under the microscope you can constantly see the vacuoles getting bigger, and about every minute one of them contracts and expels its content outside Paramecium's body.

I should also mention the white, very small, sand-grain-like structures you can see especially in the upper half of the body. I'll explain those later; it's a bit complicated and it should be accompanied by a more adequate shot which will be one of the next I post. Stay tuned, you'll be surprised.

Have a nice sunday

Ralf <schmode@vossnet.de>