Difflugia gramen or Netzelia oviformis?

carlos.uruguay · Post by **carlos.uruguay** » Thu Mar 15, 2012 5:54 am

harisA wrote:Very beautiful video. Please tell us more about the music of the video.

Hi.
thanks
This is the link to the site where got that music.
http://www.jamendo.com/en/track/818924
It is music that can be used without rights concerns
A greeting

carlos.uruguay · Post by **carlos.uruguay** » Thu Mar 15, 2012 4:07 pm

Bruce Taylor wrote:Nice work, Carlos! I think I see "scavenged" particles in the test, which would suggest a Difflugia...but I hope Ferry will see this and comment.

Thanks for your comment Bruce!
I had not seen!
I do not understand the term "scavenged"
It refers to the constitution of the lorica composed of many particles?
A greeting

Mitch640 · Post by **Mitch640** » Thu Mar 15, 2012 4:17 pm

"Scavenged" means "found". In the case of Difflugia, all the rocks are scavenged from fine sand and mud sediments. I have yet to see one being made though. That would be a treat.

carlos.uruguay · Post by **carlos.uruguay** » Thu Mar 15, 2012 4:27 pm

Mitch640 wrote:"Scavenged" means "found". In the case of Difflugia, all the rocks are scavenged from fine sand and mud sediments. I have yet to see one being made though. That would be a treat.

Thanks Mitch!
And in the case of Netzelia oviformis which is the difference in the lorica in relation to Difflugia?

Mitch640 · Post by **Mitch640** » Thu Mar 15, 2012 5:15 pm

carlos.uruguay wrote:
Mitch640 wrote: Thanks Mitch!
And in the case of Netzelia oviformis which is the difference in the lorica in relation to Difflugia?
From the description, the Netzelia is "made" by the amoeba, as chitin or silica plates that the amoeba can make in his body. That would be the difference I can think of. Some testate amoeba use plates or excreted bits of silica, like the arcella or euglypha, while difflugia use found bits of sand and quarts and glue them together with a silica based glue they excrete.

carlos.uruguay · Post by **carlos.uruguay** » Thu Mar 15, 2012 5:22 pm

Mitch640 wrote: From the description, the Netzelia is "made" by the amoeba, as chitin or silica plates that the amoeba can make in his body. That would be the difference I can think of. Some testate amoeba use plates or excreted bits of silica, like the arcella or euglypha, while difflugia use found bits of sand and quarts and glue them together with a silica based glue they excrete.

A very clear explanation Mitch.
Thank you very much!
carlos

Mitch640 · Post by **Mitch640** » Thu Mar 15, 2012 5:38 pm

I find the testate amoeba fascinating. I never knew they existed until I saw one in my microscope about a year ago. The Arcella makes hundreds of tiny silica plates, each one identical, then glues them together with a silica glue. One of the amazing things in nature, more complex than a birds nest. They are wonderful to watch.

carlos.uruguay · Post by **carlos.uruguay** » Thu Mar 15, 2012 6:13 pm

Mitch640 wrote:I find the testate amoeba fascinating. I never knew they existed until I saw one in my microscope about a year ago. The Arcella makes hundreds of tiny silica plates, each one identical, then glues them together with a silica glue. One of the amazing things in nature, more complex than a birds nest. They are wonderful to watch.

I feel the equal fascination as you.
In this opportunity I could record a part of this miracle organism:
http://www.youtube.com/watch?v=dXxkKpp07sk
A big greeting

Mitch640 · Post by **Mitch640** » Fri Mar 16, 2012 3:15 am

I can't wait to find another one. The last living one I saw was before i bought my phase contrast condenser.

Ferry · Post by **Ferry** » Fri Mar 16, 2012 11:46 am

Thank you, Mitch, by explaining the difference between Netzelia and Difflugia. Indeed Difflugia species built their shells from xenosomes, foreign material, mainly sand grains and (parts of) Diatom shells, glued together by an organic cement. These kind of shells are called "agglutinated". This Difflugia has only sand grains in its shell:

...and this one a mixture of sand and Diatoms:

Netzelia species secrete their own building material, called idiosomes, but they also use xenosomes which they modify and smooth. For an inexperienced eye, it is hard to see the difference between idiosomes and xenosomes in such a shell.
This is Netzelia wailesi:

Mitch, one correction concerning Arcella shells. These are completely build of an organic material and called proteinaceous shells. The organism secretes hollow organic globules to form the shell wall, visible as an hexagonal structure:

I wonder why you didn't see more frequently Arcella shells. I see them nearly every day, they inhabit mostly all kind of waters.

Ferry

Mitch640 · Post by **Mitch640** » Fri Mar 16, 2012 11:56 am

I wonder why you didn't see more frequently Arcella shells.

It could be my sample water. I only collect it from the Mississippi River here in town, and only a few times a year. I am thinking that the water quality deteriorates over time. Maybe loses oxygen, and they die out in my tank. I can't find any information on that. Do they require good fresh water? I know some like rotting vegetation and lower quality water.

carlos.uruguay · Post by **carlos.uruguay** » Fri Mar 16, 2012 12:01 pm

Thank you very much Mitch and Ferry

Ferry · Post by **Ferry** » Fri Mar 16, 2012 2:00 pm

Mitch, if they die out, the shells remain for ever! But usually they prefer good fresh water, but also wet and dry mosses.