Testate amoebae ?

[75RR]

Plan 40x/0.65, 160µm, DIC, 11 and 12 image stacks in Photoshop

Found these after adding some water to dryish moss.
Think they might be Testate amoebae ... they look a bit like Spumochlamys sp. but the size is all wrong.

[cuxlander]

Hi 75RR,
definitely no Spumochlamys.
Could be a very deformed Arcella, one of the larger species (discoides, megastoma, artocrea). Only a guess.
Regards,
Hans

[75RR]

Thanks cuxlander,

I had discounted Arcella as there was no apparent aperture - however the size and the rim (on the first one) do make it a possibility. The second one does look a little worse for wear, edges seem in parts to be folded over itself.

[billbillt]

I can offer no help in id, but your photos are super!.. Thanks for sharing!..

BillT

[exmarine]

What do you think its been eating? Looks possibly like the remnants of a diatom perhaps.

[75RR]

What do you think its been eating? Looks possibly like the remnants of a diatom perhaps.

Can't really say. Though I do know they like them.

[hkv]

Could it be Peridinium? I suspect my find last week might be Peridinium and they look a bit alike.

viewtopic.php?f=6&t=4242&p=38722#p38722

[75RR]

Thanks hkv,
did a search for Peridinium and agree that yours certainly looks like the images I found (had not seen your post, sorry),
I found mine on some dry moss rather than in water. Don't know if that disqualifies it.

http://fmp.conncoll.edu/Silicasecchidis ... _Main.html

[gekko]

Interesting find and nice images.