Lithocolla flavescens Penard, 1904
Diagnosis: amoeba surrounded by a thin layer of small irregular mineral grains, fixed on a thin flexible membrane; numerous fine smooth filopodia, without any granules which are so typical for true heliozoans; plasmbody usually with a yellowish color. Nucleus vesicular with central nucleolus. Fast movement.
Dimensions: c. 10 µm.
Ecology: I have sampled this species in the marshes of Kortenhoef and in a small river in Neer, in the southern part of the Netherlands.
Remarks: this amoeba can move fast, but doesn't have a rolling movement like true heliozoans. The taxonomic status of this species is uncertain.