ID on these critters

[Agathos]

Hi,

A guy at a Norwegian forum is asking what these critters are. With his permission I post his picture here. I guess some sort of flatworms...

 

[LeslieH]

I think they are the amazing invisible flatworms! :-D

 

[Agathos]

I think they are the amazing invisible flatworms! :-D

Uhm?

 

[Agathos]

Ah! I tried linking directly to pictures on the other forum's server, and that didn't work well. Here they are!

 

[pagojoe]

The ones on the rocks in the bottom pic look like they have some thickness, i.e., too much thickness for flatworms. But, best I can tell, they are just white dots. You'll probably have to get a pic with some resolution of the critters to get a real ID.

Cheers,



Don

 

[Agathos]

The ones on the rocks in the bottom pic look like they have some thickness, i.e., too much thickness for flatworms. But, best I can tell, they are just white dots. You'll probably have to get a pic with some resolution of the critters to get a real ID.

I don't have any other pictures, but I can tell you what he said about the dimensions of the animals:

"The tank has been running for 1,5 years, and the critters started to emerge two weeks ago. They are oval in shape, about 3 x 2 mm and about 1,5 mm high (concave). They are easily removed and when dried they crumble very easily."

I assume they have some sort of outer shell. From his description they sound like some sort of barnacles to me.

 

[greenbean36191]

They're nerite snail eggs.