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Long green cell with red 'eye'

 
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steve



Joined: 02 May 2010
Posts: 6

PostPosted: Tue May 25, 2010 2:02 pm    Post subject: Long green cell with red 'eye' Reply with quote

I was looking at some water from a pond in a nearby park and I kept seeing these:



Here is a closeup (I greyed out the background to make the file size smaller)



Any ideas what they could be? Is it a type of algae? It was moving slowly but steadily across the slide, in the direction of the red blob at the front of the cell.
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 18858
Location: Richland, Washington State, USA

PostPosted: Tue May 25, 2010 3:49 pm    Post subject: Reply with quote

Not my area of expertise, but Euglena acus, perhaps? (Other images HERE and HERE. Google image search will find many more.)

--Rik
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steve



Joined: 02 May 2010
Posts: 6

PostPosted: Wed May 26, 2010 12:38 pm    Post subject: Reply with quote

Looks right to me - thanks!

I ordered a book on freshwater protozoa today so hopefully I can look this kind of thing up in the future. How do you normally identify things? Do you use a book or have you just seen a lot of these things before?
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18858
Location: Richland, Washington State, USA

PostPosted: Wed May 26, 2010 1:12 pm    Post subject: Reply with quote

Quote:
Do you use a book or have you just seen a lot of these things before?

Some of each. As an admin here at photomacrography.net, I see good pictures of quite a variety of critters. That gives me some idea what to go looking for.

In this case, the red eyespot, green color, and habitat suggested Euglena, so I did a Google search on that. Some of the hits reminded me to go visit the Protist Information Server at http://protist.i.hosei.ac.jp . A search on Euglena there took me to the overview shots at http://protist.i.hosei.ac.jp/pdb/images/mastigophora/euglena/ , and poking through the images then suggested E. acus.

But like I say, this is outside my area of expertise. This could well be a different Euglena, or some other group entirely.

I suggest posting in the regular Photography Through The Microscope gallery, as opposed to here in Beginners Micro. That way your images will be seen by more people who know these things well.

--Rik
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gpmatthews



Joined: 03 Aug 2006
Posts: 1028
Location: Horsham, W. Sussex, UK

PostPosted: Wed May 26, 2010 2:32 pm    Post subject: Reply with quote

I'm pretty sure it is Euglena acus. I posted one some while ago:

http://www.photomacrography.net/forum/viewtopic.php?t=6929&highlight=euglena+acus

it looks very similar to yours.

- looking forward to seeing more of your pictures on the Photography Through The Microscope gallery
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Graham

Though we lean upon the same balustrade, the colours of the mountain are different.
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