Difflugia praestans
D. praestans, 343 µm (Naardermeer, Netherlands)

 

 

Difflugia praestans Penard, 1905)

 

Diagnosis: shell slighly yellow, large, long and straight, tubular, not compressed; fundus rounded with a short sharp spine or sometimes with two short spines. Nucleus vesicular, spherical, with one large central homogeneous nucleolus.

 

Dimensions: Length 350 - 420 µm (average 375 µm).

 

Ecology: Fresh water; sediment of deep waters

 

Difflugia praestans
Difflugia praestans, Pénard Collection, Geneva - Photograph by Thierry Arnet, as part of the Pénard project.
These shells were prepared by Penard and labeled as "Difflugia praestans" (image from Mazei and Warren, 2012). Is it a separate species or just a variation?