Marine amoeba (maybe Cashia?)

carlos.uruguay · Post by **carlos.uruguay** » Sun Dec 23, 2012 7:11 am

In this video we observe to a small salt water amoeba
With only one nucleus,
without glazing in its body,
without 'hair' in its posterior end
without a vacuola in its terminal part
Oblique light and phase contrast
Link:
http://www.youtube.com/watch?v=HmT3qir7VmA
Regards
carlos

Ferry · Post by **Ferry** » Mon Dec 24, 2012 11:44 am

It looks a little eruptive in its locomotion. I think it is a Vahlkampfia, but it is impossible to tell which species it is. Marine amoebae never have a contractile vacuole.

Cheers, Ferry

carlos.uruguay · Post by **carlos.uruguay** » Mon Dec 24, 2012 12:43 pm

Thank you very much Ferry and Merry Christmas.
One of the characteristics that observes it is that sometimes its pseudode is born of midle of the body when it changes the direction.
In that you find different from Cashia?
I consult you because I like to learn.
I would like yous opinion about these two amoebae:
http://www.photomacrography.net/forum/v ... hp?t=18882
http://www.photomacrography.net/forum/v ... hp?t=18896
And if could you tell me the difference between Vannella and Flabellula?
Thank you from already
carlos

Ferry · Post by **Ferry** » Mon Dec 24, 2012 1:56 pm

Hi Carlos,
Merry Christmas also to you! I will answer you after christmas;-)

Cheers, Ferry

carlos.uruguay · Post by **carlos.uruguay** » Mon Dec 24, 2012 2:10 pm

Thank you Ferry
carlos

Ferry · Post by **Ferry** » Thu Dec 27, 2012 12:12 pm

Hi Carlos,

In answer to your questions:
The difference between Flabellula and Vannella is here:
http://www.arcella.nl/flabellula
http://www.arcella.nl/vannella
You have to decide for your self whether your amoeba is a Vannella or a Flabellula.

It is not so important if a new pseudopod starts in the middle. It is much more characteristic if the movement is steady or eruptive. But you should be an experienced observer to see the difference.

Your first video shows Centropyxis aculeata, which you can find here:
http://www.arcella.nl/centropyxis-aculeata

The second video shows indeed Leptopyxa vorax which you can find here: http://www.arcella.nl/leptophrys-vorax

Cheers, Ferry

carlos.uruguay · Post by **carlos.uruguay** » Thu Dec 27, 2012 12:33 pm

Many thanks Ferry, i will update the information in the videos.
Only one queries more:
In Centropyxis I found it see in the minute 0.47 to 0.49 something similar to 'spine' as your samples on your site from Centropyxis spinosa. Is it incorrect?
Regards
carlos

Ferry · Post by **Ferry** » Thu Dec 27, 2012 1:16 pm

Yes, thats a phenomenon you can observe in some Centropyxis and also in some Difflugia species. It is a minute stone like a cork on a bottle. Very curious! As far as I now it is not characteristic for species distinction.

Cheers, Ferry

carlos.uruguay · Post by **carlos.uruguay** » Thu Dec 27, 2012 2:06 pm

Thanks Ferry.
Then that detail alone does not indicate that it is d.spinosa
carlos

Ferry · Post by **Ferry** » Thu Dec 27, 2012 4:14 pm

That's correct!

carlos.uruguay · Post by **carlos.uruguay** » Fri Dec 28, 2012 5:33 am

Many thanks Ferry.
I have corrected the information in the videos.
Do you have any information about cashia?
Regards

Ferry · Post by **Ferry** » Fri Dec 28, 2012 8:05 am

Here is the text from Page:

Genus Cashia Page, 1974
References: Page (1976a, 1986).
With the finding in Cashia limacoides of distinctly helical mitochondrial cristae, that character is added to the diagnosis of the genus. The species included in the earlier key (Page, 1976) as Cashia angelica is now listed under Saccamoeba, q.v.

L 7.5-25.5 um (median 14 um), tapering from rather broad anterior end (L/B x 3.3) to narrow posterior end, which may be smooth or bear small bulb; crescentic hyaline cap much reduced or absent; nucleus 2.8-4.1 um; no crystals; no cysts; sucker-like surface structures 30 nm in diameter; mitochondria never elongate. (Fig. 21H)
Cashia limacoides (Page, 1967)
(North America, Europe. NNE; multiplies slowly.)

carlos.uruguay · Post by **carlos.uruguay** » Fri Dec 28, 2012 8:55 am

Many thanks Ferry!