Bursaria: Truncatella or Bursaridium Pseudobursaria?

Have problems identifying an organism? Ask for help here.
Post Reply
Message
Author
Javier
Posts: 806
Joined: Tue May 09, 2017 11:19 am
Location: Buenos Aires, Argentina.

Bursaria: Truncatella or Bursaridium Pseudobursaria?

#1 Post by Javier » Wed Aug 03, 2022 7:20 pm

Hi,

I found this colorful Bursaria a few days ago. I would say it is Bursaria Truncatella, but as I read on Foissner - Berger friendly guide to identify ciliates, it might be also Bursaridium Pseudobursaria. It's so full of food that I can't see the shape of the macro nucleus. I would appreciate some help with the ID.

Thanks in advance,
Javier.

Attachments
Credit: Foissner / Berger
Credit: Foissner / Berger
bursaria.jpg (62.2 KiB) Viewed 1302 times

Javier
Posts: 806
Joined: Tue May 09, 2017 11:19 am
Location: Buenos Aires, Argentina.

Re: Bursaria: Truncatella or Bursaridium Pseudobursaria?

#2 Post by Javier » Wed Aug 03, 2022 7:55 pm

I was so focused on the shape of the M.N. that I missed the size factor. This is certainly Bursaria Truncatella.

User avatar
ImperatorRex
Posts: 571
Joined: Fri Mar 30, 2018 4:12 pm
Location: Germany
Contact:

Re: Bursaria: Truncatella or Bursaridium Pseudobursaria?

#3 Post by ImperatorRex » Wed Aug 03, 2022 7:59 pm

Hi Javier,
I missed the size factor
Exacetly, truncatella should be really a big fellow.

Javier
Posts: 806
Joined: Tue May 09, 2017 11:19 am
Location: Buenos Aires, Argentina.

Re: Bursaria: Truncatella or Bursaridium Pseudobursaria?

#4 Post by Javier » Wed Aug 03, 2022 8:01 pm

ImperatorRex wrote:
Wed Aug 03, 2022 7:59 pm
Hi Javier,
I missed the size factor
Exacetly, truncatella should be really a big fellow.
Thank you, Jochen. It was huge indeed, the video was taken at 100 x.

Bruce Taylor
Posts: 986
Joined: Fri Sep 04, 2015 11:34 am

Re: Bursaria: Truncatella or Bursaridium Pseudobursaria?

#5 Post by Bruce Taylor » Fri Aug 05, 2022 11:34 am

If there's any doubt, you can also distinguish Bursaridium from Bursaria by the orientation of the long, curved vestibulum (a funnel-like structure leading to the mouth). In Bursaria, it curves to the left of the cell, in Bursaridium to the right.

As you say, if the size is >200 micrometres, it's almost certainly Bursaria. However, Bursaria truncatella is not the only candidate. In a posthumously published monograph, Foissner and his colleagues review the genus, and provide detailed information on six more species of Bursaria: https://www.researchgate.net/publicatio ... _Edited_by

Javier
Posts: 806
Joined: Tue May 09, 2017 11:19 am
Location: Buenos Aires, Argentina.

Re: Bursaria: Truncatella or Bursaridium Pseudobursaria?

#6 Post by Javier » Fri Aug 05, 2022 7:42 pm

Thanks, Bruce, for your always interesting input. I'll read those publications as soon as possible.

Post Reply