black and white portrait
Heteronema (het-err-owe-knee-ma) larseni Lee and Patterson, 2000. Cells are ovate, 35 to 48 microns long, flattened, with a posterior point to the cell. Approximately 36 pellicular striations follow an S-helix. The striations of the ventral face are more distinct than the dorsal ones. The striations appear to overlap each other, with raised ridges being separated by flat regions. Some but not all cells have globular granules located along the grooves. This species is capable of squirming movements, but not vigorously so. The anterior flagellum is about the length of the cell and bends to the right while the cell is swimming. The posterior flagellum bends to the left while swimming, is slightly longer than the cell and is stronger than the anterior flagellum. The posterior flagellum is swollen near its base. The ingestion organelle has two conspicuous thick rods and extends to two thirds of the length of the cell. Consumes diatoms, one cell containing diatoms up to 22 microns long. The reservoir is pear-shaped and in the left half of the cell. The nucleus is about 15 microns long and located in the left side of the cell near the midline. About 2 microns size refractile bodies lie around the reservoir, ingestion organelle and nucleus. The cells move by skidding in close contact with the substrate. This picture was taken by Won Je Lee using conventional photographic film using a Zeiss Axiophot microscope of material collected in marine sediments of Botany Bay (Sydney, Australia). The image description refers to material from Botany Bay. Image copyright: Won Je Lee, image used under license to MBL (micro*scope).
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Heteronema larseni
From the collection
Heterotrophic flagellates of Botany Bay, Sydney, Australia
| Description of Heteronema larseni: Cells are ovate, 35 to 48 microns long, flattened, with a posterior point to the cell. Approximately 36 pellicular striations follow an S-helix. The striations of the ventral face are more distinct than the dorsal ones. The striations appear to overlap each other, with raised ridges being separated by flat regions. Some but not all cells have globular granules located along the grooves. This species is capable of squirming movements, but not vigorously so. The anterior flagellum is about the length of the cell and bends to the right while the cell is swimming. The posterior flagellum bends to the left while swimming, is slightly longer than the cell and is stronger than the anterior flagellum. The posterior flagellum is swollen near its base. The ingestion organelle has two conspicuous thick rods and extends to two thirds of the length of the cell. Consumes diatoms, one cell containing diatoms up to 22 microns long. The reservoir is pear-shaped and in the left half of the cell. The nucleus is about 15 microns long and located in the left side of the cell near the midline. About 2 microns size refractile bodies lie around the reservoir, ingestion organelle and nucleus. The cells move by skidding in close contact with the substrate. |
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