Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs from every shell I’ve seen before. One shell was symmetrical and the other asymmetrical.
I found this species only in the sediment of a ditch in the nature reserve Naardermeer in the Netherlands. I am not convinced that this is a separate species. I always found it together with specimens of Difflugia nodosa. Probably both species are identical. Further records are necessary.
I’m not convinced that the species below belong to D. claviformis.
Pseudostome and neck
The same Difflugia compared with some other species in the same sample from Lolo Pass, 98-461 µm.
