black and white portrait

Description:

Dolium (doe-lee-um) sedentarium Larsen and Patterson, 1990. Cells are vase-shaped, about 37 - 43 microns long, rigid and slightly flattened, with an anterior end opened with an anterior depression in front of flagellar canal and a pointed posterior end. Cytoplasm is hyaline. The cells are with three longitudinal ridges on the dorsal side and three on the ventral side. The ventral ridges are more delicate than those on the dorsal side. One emergent flagellum is about the cell length and beats slowly, and two flagellar basal bodies are visible in the flagellar reservoir. One contractile vacuole is located near the reservoir. The nucleus is located laterally and below the reservoir. The cells contain large numbers of granular bodies. The cells attach to the substrate with the pointed posterior tip of the cell and appear to be sessile. Swimming or gliding forms were not seen. Not often found, but relatively frequent in some locations.