Taxonomical Group Protozoa
Bakker et al. 1982: Rhizopod cells composed of a series of chambers of increasing size. There are 6-8 chambers in one convolution, which is coiled in a planispiral and is up to c. 220 micron in diameter.
First publication 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.