Lagenodifflugia bryophila (Penard, 1902)
Diagnosis: test pyriform, slightly bend, with a constriction of the neck. Test circular in cross-section, composed of mineral particles and diatom frustules, embedded in an organic cement. Aperture circular; internally the test is partitioned into two regions by a diaphragm constructed as part of the shell wall but having a single central orifice.
Dimensions: Penard: 100-125 µm long; my measurements: 132 µm long
Ecology: ditches, between detritus.
Remarks: I am not fully convinced of my identification with Lagenodifflugia bryophila, but this is the closest species.