Search found 118 matches

by cuxlander
Sat Dec 01, 2018 10:59 am
Forum: Pictures and Videos
Topic: Amoeba (arcella?) 'walking'
Replies: 14
Views: 2181

Re: Amoeba (arcella?) 'walking'

Hi Aenima,
the first one is a Centropyxis most probably aculeata.
Second one ?? I wonder if phase contrast is the right method for this kind of object?
The last one??
Cheers,
Hans
by cuxlander
Sun Nov 25, 2018 6:35 pm
Forum: Pictures and Videos
Topic: Miscellaneous Photomicrographs
Replies: 13
Views: 2062

Re: Miscellaneous Photomicrographs

Hello RobBerdan,
impressive photos, although I love to see Volvox in its natural colours.
Cheers,
Hans
by cuxlander
Mon Nov 12, 2018 9:48 am
Forum: Pictures and Videos
Topic: Spiral shell?
Replies: 6
Views: 1064

Re: Spiral shell?

@75RR
definitely a foram,
see my posting viewtopic.php?f=6&t=5818
Cheers,
Hans
by cuxlander
Fri Nov 09, 2018 8:00 am
Forum: Pictures and Videos
Topic: Testate amoeba Heleopera petricola
Replies: 2
Views: 831

Re: Testate amoeba Heleopera petricola

@bob
I have sent you a PM
Hans
by cuxlander
Thu Nov 08, 2018 2:27 pm
Forum: Specimens, samples and slides
Topic: Pond aquarium / fish tank - how do you go about installing and keeping it?
Replies: 23
Views: 6603

Re: Pond aquarium / fish tank - how do you go about installing and keeping it?

Hello @MicroBob,
originally I thought to keep the platform above water level to keep it moist
Why don't you let your platform swim in a defined immersion depth?
Greetings,
Hans
by cuxlander
Thu Nov 08, 2018 2:21 pm
Forum: Specimens, samples and slides
Topic: Pond aquarium / fish tank - how do you go about installing and keeping it?
Replies: 23
Views: 6603

Re: Pond aquarium / fish tank - how do you go about installing and keeping it?

Hello, interesting thread. I have a similar project and wonder if anybody here has any idea: Recenctly I have obtained a handful of bog sphagnum inhabiting several species of testate amoeba. Sphagnum are multi storey buildings with organisms in the bottom region requiring pure water, up to some in t...
by cuxlander
Wed Nov 07, 2018 1:03 pm
Forum: Pictures and Videos
Topic: Testate amoeba Heleopera petricola
Replies: 2
Views: 831

Testate amoeba Heleopera petricola

Hello forum, Heleopera petricola is not uncommon in wet bog sphagnum. Unfortunately water samples from this source usually are quite untidy, with sphagnum leaves and other debris spoiling the view. So it is a challenge to view a tidy specimen. Here is a nice 135 µm high specimen: http://www.hans-rot...
by cuxlander
Tue Oct 09, 2018 9:08 am
Forum: Pictures and Videos
Topic: Amobeae tests (fresh water)
Replies: 15
Views: 2434

Re: Amobeae tests (fresh water)

Hello 75RR, I believe your amoebae belong to the genus Zonomyxa. I had based my guess on the countless small (< 1 µm) violet granules filling the cytoplasm. There are two very similar Genera: Amphizonella found in dryer moss. Zonomyxa living in Sphagnum. (see also http://www1.nencki.gov.pl/pdf/ap/ap...
by cuxlander
Fri Oct 05, 2018 9:58 am
Forum: Pictures and Videos
Topic: Amobeae tests (fresh water)
Replies: 15
Views: 2434

Re: Amobeae tests (fresh water)

Hello 75RR,

I believe your amoebae belong to the genus Zonomyxa.
See also http://www.mikro-tuemplerforum.at/viewt ... 625&p=2064

Regards,
Hans
by cuxlander
Sun Sep 30, 2018 1:38 pm
Forum: Identification help
Topic: Swamp Biscuit
Replies: 5
Views: 1788

Re: Swamp Biscuit

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
by cuxlander
Sat Sep 08, 2018 6:23 pm
Forum: Identification help
Topic: a kind of Amoeba?
Replies: 10
Views: 3473

Re: a kind of Amoeba?

Hello Aenima,
I believe it is Zonomyxa violacea or an Amphizonella species.
Cheers,
Hans


Added: Se my http://hans-rothauscher.de/testaceen/pyxidicula.htm
by cuxlander
Thu Apr 19, 2018 10:22 am
Forum: Pictures and Videos
Topic: Poor man's SEM
Replies: 10
Views: 1336

Re: Poor man's SEM

Hello @desertrat a scientific paper Thanks, I did not know this paper. Interesting that testate amoebae predated the Ediacarian. I have read somewhere that the filopodia (Eyglypha) are still considerably older than the arcellinida. Also interesting that Testate amoebae have been successfully used as...
by cuxlander
Tue Apr 17, 2018 8:58 am
Forum: Pictures and Videos
Topic: Poor man's SEM
Replies: 10
Views: 1336

Re: Poor man's SEM

Addendum:

@ Charlie Guevara
All Hyalospheniidae are quite flat, see

Image

Hans
by cuxlander
Tue Apr 17, 2018 8:42 am
Forum: Pictures and Videos
Topic: Poor man's SEM
Replies: 10
Views: 1336

Re: Poor man's SEM

Thanks for your comments. The collection and subsequent use of xenosomes, i.e. foreign materials for the reenforcement of testacea shells has frequently raised the question: May this already be called behaviour? Many members of the Hyalospheniidae build their shells using recycled shell plates scave...
by cuxlander
Mon Apr 16, 2018 4:36 pm
Forum: Pictures and Videos
Topic: Poor man's SEM
Replies: 10
Views: 1336

Poor man's SEM

Hello, ths is the 169 µm high testate amoeba Planocarina (former Nebela) marginata obliquely illuminated: http://www.hans-rothauscher.de/testaceen/forum/marginata.jpg The shell is covered with scales which had been robbed from Euglypha and other foreign objects. 40x Neofluar, Stacked image, contrast...
by cuxlander
Tue Mar 06, 2018 5:43 pm
Forum: Pictures and Videos
Topic: Some Forams from Indian Ocean
Replies: 7
Views: 1185

Re: Some Forams from Indian Ocean

Hello RR,
My wife collected them from Mombasa beach. The ones I measured were between 250 and 400 µm.
Greetings,
Hans
by cuxlander
Tue Mar 06, 2018 12:02 pm
Forum: Pictures and Videos
Topic: Some Forams from Indian Ocean
Replies: 7
Views: 1185

Some Forams from Indian Ocean

Hello, here are some Foraminifers from Mombasa Beach, Kenia: http://www.hans-rothauscher.de/testaceen/forum/foram11.jpg http://www.hans-rothauscher.de/testaceen/forum/foram12.jpg http://www.hans-rothauscher.de/testaceen/forum/foram6.jpg http://www.hans-rothauscher.de/testaceen/forum/foram9.jpg Speci...
by cuxlander
Thu Feb 08, 2018 8:01 am
Forum: Pictures and Videos
Topic: Copepod, Amoeba and Algae
Replies: 14
Views: 1448

Re: Copepod, Amoeba and Algae

Sorry Kurt for wrong spelling.

Even the word hyalinity, I fear, does not exist and is my own word creation.

When Arcella cells are young, their shells are are colorless and hyaline, i.e. translucent, older ones become brown and intransparent.

Sorry for confusion.

Hans
by cuxlander
Tue Feb 06, 2018 12:28 pm
Forum: Pictures and Videos
Topic: Copepod, Amoeba and Algae
Replies: 14
Views: 1448

Re: Copepod, Amoeba and Algae

Hello Hakan, they are all great. I like the Arcella best. I believe its a young Arcella gibbosa, when they grow older they partly loose their hyalanity. The blob bottom left of the sarcode is a contractile vacuole. By osmotic pressure the organism constantly absorbs water. The vacuole pumps excessiv...
by cuxlander
Mon Nov 27, 2017 12:14 pm
Forum: Pictures and Videos
Topic: Arcella mitrata
Replies: 2
Views: 555

Arcella mitrata

Hello,
this is an insight into a 120 µm wide alive Arcella mitrata:
Image
One focal plane. 60x achromat.
Cheers,
Hans
by cuxlander
Mon Nov 06, 2017 12:51 pm
Forum: Pictures and Videos
Topic: Ceratium, Tachysoma & Uroglenopsis
Replies: 14
Views: 1797

Re: Ceratium, Tachysoma & Uroglena

Hi HKV,
I like best the first Ceratium.
Hans
by cuxlander
Sun Nov 05, 2017 1:01 pm
Forum: Camera systems and imaging
Topic: Tethered shooting
Replies: 5
Views: 2501

Re: Tethered shooting

Hello John B, yes, a lot of very useful information for me to start with, thanks. At present I use a Toupcam-cmos-camera with the adapter FMR 050 and the great Toupview software which came with it. Here is my present tool, and I do not want to miss the pretty Zeiss KF2, and I very much like the conv...
by cuxlander
Sat Nov 04, 2017 8:18 pm
Forum: Camera systems and imaging
Topic: Tethered shooting
Replies: 5
Views: 2501

Tethered shooting

Hello,

Which cameras, DSLR or compact (micro four-third?), can be controlled via the laptop, i. e. tethered shooting? Until now I only found high end Olympus like the E-M1 and the E-M5 Mark II.

Thanks,
Hans
by cuxlander
Sun Oct 29, 2017 2:32 pm
Forum: Pictures and Videos
Topic: Surface structure of Arcella
Replies: 7
Views: 1075

Re: Surface structure of Arcella

Thanks Jim,

No DIC, basic brightfield using achromats.

Greetings,
Hans
by cuxlander
Sun Oct 29, 2017 9:03 am
Forum: Pictures and Videos
Topic: Surface structure of Arcella
Replies: 7
Views: 1075

Surface structure of Arcella

Hello,

this image shows the honeycomb structure of the shell of a live Arcella cf. vulgaris, 102 µm dia, dorsal view.
Stack of 25, 60x dry Achromat:

Image

Cheers,
Hans
by cuxlander
Fri Oct 13, 2017 11:06 am
Forum: Identification help
Topic: is this a diatom ?
Replies: 4
Views: 1668

Re: is this a diatom ?

Hello Mr. Micro,
it is a testate amoeba, definitely a Centropyxis species most probably C. aculeata.
Cheers,
Hans


See https://arcella.nl/centropyxis-aculeata
(edit this link added)
by cuxlander
Sat Oct 07, 2017 5:29 pm
Forum: Pictures and Videos
Topic: "Nacimiento" de un nuevo Arcella
Replies: 14
Views: 2470

Re: "Nacimiento" de un nuevo Arcella

Hi Francisco,
Thanks, interesting! How the plasma moves to and fro between the two shells, until both have an equal share and composition of plasma and food particles.
Hans
by cuxlander
Sat Oct 07, 2017 6:44 am
Forum: Pictures and Videos
Topic: The rare Arcella formosa
Replies: 8
Views: 1466

Re: The rare Arcella formosa

Thanks Jim,
these were two individuals on same slide. A matter of good luck.
Greetings, Hans
by cuxlander
Mon Oct 02, 2017 10:25 am
Forum: Pictures and Videos
Topic: The rare Arcella formosa
Replies: 8
Views: 1466

The rare Arcella formosa

Hello, this is the rare Arcella formosa ( about 200 µm wide). It has so far only been found in a few locations in Canada, Netherlands, Hungary, Germany (Mecklenburg) and this year by me in a nearby fen: http://www.hans-rothauscher.de/testaceen/forum/formosa8.jpg (dorsal) http://www.hans-rothauscher....
by cuxlander
Mon Oct 02, 2017 9:23 am
Forum: Pictures and Videos
Topic: Bacillaria paxillifer.
Replies: 6
Views: 1228

Re: Bacillaria paxillifer.

Hello Francisco,
Very interesting, only saw them once.
Was this in fresh water?
Hans