Rotifer

[75RR]

40x and 20x, about 160µm, Offset Dark Stop and Darkfield.
Unfortunately the foot was tucked under the Rotifer so not an ideal photo for ID purposes.

[gekko]

Superb images (both the oblique and the dark field)! Thank you for posting them.

[charlie g]

Hello,gekko...beautiful images. Can you share the stand and the setup you used for this image of a rotifer?

all the best, charlie guevara

[75RR]

Can you share the stand and the setup you used for this image of a rotifer?

40x and 20x, about 160µm, Offset Dark Stop and Darkfield.

The 40x and 20x refer to the Objectives.
In this case a 40x Achromat and a 20x NeoFluar
Olympus E-p2 with 28mm Legacy OM lens on a tripod shooting through eyepiece.

The Darkfield (in my case) was achieved using a home made Dark Stop/Patch, printed on an acetate sheet.
The Offset Dark Stop is achieved by swinging out the filter a little bit.

Link is to an article on this. Photo is of my Microscope. It is a Zeiss Standard Junior and about 60 years old.

http://www.microscopy-uk.org.uk/mag/ind ... trast.html

[gekko]

Hello,gekko...beautiful images. Can you share the stand and the setup you used for this image of a rotifer?

all the best, charlie guevara

Hello Charlie,
These exceptionally beautiful rotifer images are actually 75RR's (don't I wish they were mine!)

[actinophrys]

Unfortunately the foot was tucked under the Rotifer so not an ideal photo for ID purposes.

Possibly, but just for the record the way the lorica is separated into plates, single eye, and that it could tuck its foot under its body do clearly show it as some type of Lecane (which currently include Monostyla).

[75RR]

Possibly, but just for the record the way the lorica is separated into plates, single eye, and that it could tuck its foot under its body do clearly show it as some type of Lecane (which currently include Monostyla)

Didn't think to attempt an identification, did not really know where to start.
Now that you have, let me add that it had two feet.
Looking through Shiel's: A guide to identification of Rotifers, ... (Australia Inland Waters), even though I am in South America,
how does L. nana (or something very like it) sound to you?
.

[actinophrys]

Those would be spine-like toes on an otherwise reduced foot, which is characteristic for the genus. I'm afraid I don't have nearly the expertise to help beyond that. I found a paper by Segers (1996) that does confirm L. nana is found in the Neotropical region, but as one of over 80 littoral species, and at a superficial look it is hard to say some other double-toed species aren't also similar.

[75RR]

Have you downloaded Shiel? Am attaching link. See page 88 (Fig. 49:5)
The work is on freshwater rotifers, not littoral.

Afraid I did not really concentrate on the foot.
Still have sample jar - might see another.


http://www.google.com/url?sa=t&rct=j&q= ... NcF_iXAgFw

[actinophrys]

No, I hadn't seen Shiel's guide before. It looks very useful, and I think should let me identify at least one type I've seen that didn't seem to be in most other sources - plus it is always nice to see a bit more on what different kinds actually eat. Thanks very much for sharing it.