Nebela collaris

gpmatthews · Post by **gpmatthews** » Mon May 28, 2012 3:57 pm

Microscope: Zeiss Standard
Ocular: Zeiss KPL-W 10/18
Objective:Leitz 25/0.55 ICT NPL Fuotar
Substage: Leitz 0.9NA ICT
Sample from Monkmead Woods, West Chiltington, West Sussex, UK
15 images Zerene Stacker

Ferry · Post by **Ferry** » Thu May 31, 2012 3:26 pm

It might be Nebela tincta, but the distinction between both species is arbitrary. An important characteristic is the presence of two lateral pores just above the neck (=N. tincta).

gpmatthews · Post by **gpmatthews** » Fri Jun 01, 2012 1:47 am

Thanks for this -

According to the FBA guide* Nebela tincta should be yellow (maybe there is hint of yellow in the image?)and partially overlain with a smooth layer of organic cement. The Guide also mentions in respect of Nebela collaris that "Many surveys combine the species with N. bohemica Taranek. On balance I felt N. collaris was more probable than N. tincta. I think the two features in the image below may be pores, but they are lower down the test from the pseudostome than in the Guide's illustrations:

*Guide to the identification of Soil Protozoa - Testate Amoeba, Clarke, K.J., Freshwater Biological Association 2003

Ferry · Post by **Ferry** » Fri Jun 01, 2012 2:36 am

Hi Graham,

The color isn't very characteristic. Your arrows don't indicate pores. Pores should be on the very edge of the shell, at 1/3 from the mouth:

You can compare http://www.arcella.nl/nebela-tincta with http://www.arcella.nl/nebela-collaris.

gpmatthews · Post by **gpmatthews** » Fri Jun 01, 2012 2:45 am

OK, thanks - if I find another, I'll try some new images...

Mitch640 · Post by **Mitch640** » Fri Jun 01, 2012 9:48 am

Wonderful work. Are the pores for water circulation?

Ferry · Post by **Ferry** » Sat Jun 02, 2012 10:07 am

We don't know what function they have. Some species have pores at the fundus, some have two, others have up to ten, depending upon the depth of the water.