Parvicorbicula socialis (Meunier, 1910) Deflandre, 1960. The funnel-shaped lorica of this species is about 10 microns in diameter, with 10 longitudinal costae converging posteriorly, and two transverse costae. Each longitudinal costa consists of two costal strips. The anterior ring is made up of ten strips, each with a longitudinal costa attached to its middle part forming T-junctions. Drawing from a flattened lorica.
