D. pyriformis , all from the same location, 290-297 µm – Nunspeet, oligotrophic pond
Difflugia pyriformis Perty, 1849
Description. These shells come from an oligotrophic pond near the city of Nunspeet and an eutrophic pond near Hilversum. The shells were build from relatively large sand grains. The nucleus was filled with a large number of more or less spherical nucleoli of different sizes.
Nucleus, 43 µm in diameter – Nunspeet
Nucleus, with two different DOF, 56 µm in diameter – from ‘s-Graveland
Shell, from ‘s-Graveland