Difflugia schizocaulis (Stepanek, 1952)
Diagnosis: shell ovoid to pyriform, with an irregularly forked aboral protrusion; usually both humps or extremities are inequal in length. Shell composed of small to large pieces of flat quartz. Nucleoli fusiform.
Dimensions: Stepanek: 175-332 µm. My measurements c. 196 um (n=2).
Ecology: freshwater, sediment.
Remarks: I found two specimens in a sample with no other Difflugia species.