Bakker et al. 1982: Globose to ovoid microfossils, c. 15-18 micron in diameter. One pore (c. 0.5-1 micron in diameter) with an annulus c. 1 micron thick. Inner surface covered with numerous granules of c. 0.3 micron in diameter, 0.2-1.0 micron apart. Outer surface smooth.
Bakker R, van Smeerdijk DG (1982) A palaecological study of a Late Holocene section from 'Het Ilperweld', W. Netherlands. Rev. Palaeobot. Palynol. 36:95-163.