Pseudosetia has always been considered very rare, but this may be due to problems with the identification. Fresh shells are transparent and smooth, somewhat similar in shape and appearance to Pusillina inconspicua (ALDER) but with a larger and blunter protoconch. Species of Pseudosetia never have axial sculpture or colour patterns but often there is a very thin spiral rib forming a continuation of the suture all around the body whorl.

Distribution. Northern Norway from Voringen stn 267 ca 72° N, 37° E. 271 m) and the Iceland-Faroe Ridec. Southwards along the European continental slopes to northern Spain. Depth range 90-1500 meters.
Pseudosetia turgida is often common on deep, 100-600 m, slightly current swept, muddy to silty bottoms. It is more rare when the bottoms arc pure mud or start to get sandy