portrait
Dolium (dough-lee-um) is so far only reported from marine habitats. This is the only known heterotrophic euglenid which does not swim around. It is usually found attached to the substrate by the tapered posterior end. Two flagella arise in the flagellar pocket, but only one emerges. Most usually with diatoms inside, method of feeding is not known. Seems to be more common in slightly anoxic sites. Differential interference contrast. This picture was taken by David Patterson, Linda Amaral Zettler and Virginia Edgcomb of material from the salt marsh at Little Sippewissett (Massachusetts, USA) in Autumn, 2000 and in Spring and summer, 2001. Image copyright: D. J. Patterson, L. Amaral-Zettler and V. Edgcomb, image used under license to MBL (micro*scope).
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Dolium sedentarium
From the collection
Little Sippewissett salt marsh, Massachusetts, USA
| Description of Dolium sedentarium: 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 have 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. |
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