Sorry, my reply comes a little bit late….
Perhaps this paper may help:

Schönborn, W., Petz, W., Wanner, M., Foissner. W.: Observations on the Morphology and Ecology of the Soil-Inhabiting Testate Amoeba Schoenbornia humicola (Schönborn, 1964) Decloitre, 1964 (Protozoa, Rhizopoda). Arch. Protistenkd. 134: 315-330 (1987).

Best regards,

Manfred Wanner

Best,
Ferry

I'm writing to ask about Schoenbornia humicola, more specifically, about the shell of the species.

I was trying to find information about the type of shell Schoenbornia humicol builds.

I contacted Ferry and he assured me about what I found in literature (paper attached, the original description as Pseudonebela humicola):

Schönborn describes the shell has having "siliceous plates as idiosomes" ("… mit Siliziumplättchen als Idiosomen"). Further he observed new-formed idiosoms in the cell plasm just like Euglypha ("Im Plasma der inaktiven Stadien beobachtete ich mehrmals vorgebildete Idiosomen ähnlich wie bei Eulgypha.").

Ferry Siemensma confirmed this.

Edward Mitchell believes these are not idiosomes because the platelets are not of uniform shape or size, at least according to the illustration used by Meisterfeld (2002). Rather they look at best as recycled idiosomes but may even be flat mineral such as mica.

Andrey Tsyganov agrees. "I agree with Edward that truly idiosomic species should have limited number of plates types of regular shape because they synthesize them. In case with Shoenbornia it seems that the plates are irregular in shape and size that rather points to extracellular origin of the plates than to unusual intracellular synthesis. "

Reference:
Meisterfeld, R. (2002) Order Arcellinida Kent, 1880. The illustrated guide to the protozoa (eds J. J. Lee, G. F. Leedale & P. Bradbury), pp. 827-860. Society of protozoologists, Lawrence, Kansas, USA.)
Schönborn, W. (1964) Bodenbewohnende Testaceen aus Deutschland. I. Unterstuchungen im Naturschutzgebiet Sarrahn (Macklenburg). Limnologica, 2, 105-122.

I'm quite sure that what you observed would have been called Phryganella acropodia by many ecologists. I have frequently observed very similar tests ca. 30µm diameter together with larger ones ca. 50µm. Depending on which key you use they may even be included in the Cyclopyxis arcelloides-type.

Of course if you have living specimens with visible pseudopods you will know if they are Phryganella or not based on the pseudopod morphology. Empty tests are more tricky.

It is quite clear that these general morphotypes likely include several taxa. It would be very useful to conduct a study combining morphometrics, DNA barcoding and ecological observations to clarify this maze…

For more precise identification it would be helpful to have the sizes.

A few more images from Bindu

https://www.flickr.com/photos/138255200@N08/

82-18a is a Nebela (Anush can help further)
82-18 Euglypha
82-8a Trinema
72h Euglypha

A new colleague, Bindu, is requesting some help identifying species from India. They can be found here:

https://www.flickr.com/photos/158646024@N07/

https://www.flickr.com/photos/158646024@N07/

I am looking for this paper:

van Oye P. 1956. Rhizopoda Venezuelas. Erg. Dents. Limnol. Venezuela Exp. 1: 329-360.

Also, I am looking for paper with description of Nebela d'ydevallei van Oye 1953.

Does anybody have these papers? My e-mail address is moc.oohay|atekulnafets#moc.oohay|atekulnafets

Thank you very much in advance.

With best regards,
Stefan Luketa

I am looking for these two papers:

1) Vucetich MC. 1983. Contribucion al conocimiento del genero Quadrulella Cockerell, 1909 (Rhizopoda: Testaceolobosa) en la Argentina. Limnobios. 2(7): 526-532.

2) Lopretto EC, Vucetich MC. 1997. A new species of the genus Quadrulella Cockerell, 1909 (Rhizopoda: Testacea). Neotropica (La Plata). 43: 3-5.

Does anybody have these papers? My e-mail address is moc.oohay|atekulnafets#moc.oohay|atekulnafets

Thank you very much in advance.

With best regards,
Stefan Luketa

Anna

I have posted these references on dropbox for you. If anyone else wants these (or others) let me know.

If you have any problem with the French let me know.

cheers

Edward

I would be very grateful if someone could send me them at my email address moc.liamg|93avomis#moc.liamg|93avomis.

Best regards,
Anna

Thank you in advance for any comments!

Best regards,
Anna Šímová

The link for picture will add here Daniel Lahr (Thanks a lot!), because I'm not allowed to publish links on this site.

Best regards,
Itzel

Excellent idea the ISoP sponsored student award!

Can't wait to come to this meeting!

cheers

Edward

best wishes

Edward

Many of you have been asking about the meeting. We are running a little late with arrangements but the meeting will occur form September 12 to 15 in Ilhabela, SP, Brazil. We will also have a ISoP sponsored student award that should help pay some students (at the same time giving them an awesome title on their CVs).

My expectations were to have the website and registrations up and running by April 1st, but this will not happen. Hopefully by mid-April we will be in business.

But do not despair, the meeting will happen and I do hope to see all of you here.

Best,

I am looking for this paper:

Schönborn W. (1992) Adaptive polymorphism in soil-inhabiting testate amebas (Rhizopoda) - its importance for delimitation and evolution of asexual species. Arch. Protistenk. 142: 139-155

Does anybody have it? My e-mail is xm.moc.oohay|rslezti#xm.moc.oohay|rslezti

Thank you in advance

How are you? I am searching the paper:

MEDIOLI, FS, DB SCOTT, and BH ABBOTT. 1987. "A Case-Study of Protozoan Intraclonal Variability - Taxonomic Implications." Journal of Foraminiferal Research 17(1): 28-47.

Someone has it? My e-mail is xm.moc.oohay|rslezti#xm.moc.oohay|rslezti.
Thank you

Have a good day!

Thank you in advance!
Anna Šímová

The problem is that you don't have any information about its pseudopodia, that would really help. It could be a Pseudodifflugia, as Dan writes, but also a Cryptodifflugia or a new taxon. Could you send me a sample? I always like to see it myself ;-)

Best wishes,

Ferry

To me this could be a Chlamydophryiidae or a Pseudodifflugiidae. These small testates with filopodia are desperately needing to be studied more deeply! If I really really needed to say a genus, I would say Ovulinata. I wonder what others think.

any chance you could get an SEM image? or send a sample to someone to image it?

best,

dan

I brought a sample to ISTA7 in Poznan but it was difficult to reach a firm conclusion in the time available. Any further suggestions are most welcomed!

Best wishes,

Tom Roland.

Manish, do you think you could make a picture from another angle? How about some info on where it was collected from?

best,

Best wishes

Edward Mitchell

Best,

dan

the images show the same individual. The image to the right is the lateral view. The sample was mud of a small river that passes through old sphagnum moors. Pores were not visible.

Best,
Eckhard

Are the first two images distinct individuals or different views of the same individual?

dan

Prof. José Barufi, in southern Brazil, has suggested that this indeed would be a haptophyte. His words:

"My votes are to Haptophyte, considering plates scheme and general layout. However, you should be able to find a haptonema to be certainly sure about it. Maybe is this structure leaving out the cell?"

cheers!

my partner Steffen found this Hyalosphenia in northern Germany. At the collection site it was an abundant species ranging in size from 100 to 120 µm. We know the exact location. The shell has a particular structure that we did not see in Hyalosphenia before. I have posted the image of the shell structure in the twilight zone as I am not allowed to post image links here due to missing karma ;)

I don't know whether we will visit the collection site this year again, as it is getting quiet cold here. If we do we will have isolates for sequencing. 

Best regards,
Eckhard

It could be H. penardi or H. gigantea. Both are river species from Germany or NL.

Where did you find this?

Can you isolate any for sequencing?

I sent an e-mail out to the ALGAE-L listserv. I gave them the address of this website to check the image. I will post here whatever they respond.

cheers!

I looked at it from all sides and did not see an aperture.

Eckhard

Other possibilities are:

- centrohelid heliozoan (strange, but possible)
- small scaled algae (could be green alga or haptophyte)

Composition of the scales could be helpful too.

Have you posted this picture on algae forums? I can send it out if you want.

dan

Have you seen pseudopodia to give us any further indication that this could be a euglyphid?

In any case it shows that we should be looking more carefully at <10 or even <5µm protists!