Swamp Biscuit

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Grahame
Posts: 99
Joined: Fri Jun 29, 2018 7:42 am
Location: New Zealand

Swamp Biscuit

#1 Post by Grahame » Sat Sep 29, 2018 9:06 am

Hi folks,
Found in a slow moving stream in a freshwater wetland.
Haven't seen anything quite like this before.
Found 2 in the sample.
Thoughts folks ?
Cheers
Biscuit 2.jpg
Biscuit 2.jpg (66.94 KiB) Viewed 1443 times
Biscuit 1.jpg
Biscuit 1.jpg (74.99 KiB) Viewed 1443 times

Hobbyst46
Posts: 2157
Joined: Mon Aug 21, 2017 9:02 pm

Re: Swamp Biscuit

#2 Post by Hobbyst46 » Sat Sep 29, 2018 10:06 am

Amazing - hopefully, might be a centric diatom!?
I would try and devise a way to eliminate the yellow pigments and expose a (hopefully) clean frustule. Easier said than done, if there are only two of its kind...
Zeiss Standard GFL+Canon EOS-M10, Olympus VMZ stereo

Bruce Taylor
Posts: 209
Joined: Fri Sep 04, 2015 11:34 am

Re: Swamp Biscuit

#3 Post by Bruce Taylor » Sat Sep 29, 2018 11:28 am

It's the shell of a dead Arcella (testate amoeba). :)

Grahame
Posts: 99
Joined: Fri Jun 29, 2018 7:42 am
Location: New Zealand

Re: Swamp Biscuit

#4 Post by Grahame » Sat Sep 29, 2018 8:51 pm

Thanks folks
Hobbyst46, that is levels of skill way beyond me, I don't have the gear or ability to even separate it from all the other "crud" in that very small sample.
Let alone do all the clever stuff I read about in the recent thread on cleaning diatoms.
Bruce, Arcella was sort of my thought but it didn't occur to me to think of it being an empty house for one :)
Cheers

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cuxlander
Posts: 105
Joined: Sat Sep 17, 2016 12:13 pm

Re: Swamp Biscuit

#5 Post by cuxlander » Sun Sep 30, 2018 1:38 pm

Hello Grahame,
cannot figure the size oft he creatures from the numbers in the pictures, 30 µm and 20 µm cannot be the diameters?
I believe these are Arcella of the hemisphaerica/rotundata/intermedia-Komplex, sizes between approx. 35 and 62 µm.
Greetings,
Hans

Grahame
Posts: 99
Joined: Fri Jun 29, 2018 7:42 am
Location: New Zealand

Re: Swamp Biscuit

#6 Post by Grahame » Sun Sep 30, 2018 7:59 pm

Hi Hans,
Yes that is the diameter of the shells.
Thanks for the ideas about the group they belong to.
That's an interesting website you have must have a better look later on.
Cheers

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