Pelomyxa flava
Pelomyxa spec., 550 µm long

Pelomyxa cf flava

Diagnosis: Slow moving pelomyxoids with ovoid, cylindrically or irregularly shaped bodies. The cytoplasm is transparent and brownish-green due to inclusions. Hyaloplasm sometimes in bulges. Nuclei are of a granular type and the fragmented nucleolar mate­rial is located along the periphery of the nucleus. Flagella are immo­bile. Endosymbionts are represented by large and thinner rodlike bacteria. Glycogen bodies present.

Dimensions: The size of the cells ranges from 100 to 600 µm. Nuclei 20-27 µm

Ecology: This species resembles P. flava, but it is much larger and has more nuclei, about 7 to 12. I found it in Crailoo, which is a small artificial lake, mesotrophic, up to 1 meter deep, with a thin layer of organic sediment. The food mainly consists of green algae, both small and large.

Pelomyxa cf flava
Pelomyxa cf flava
Nucleus, 24 µm (l); three nuclei, arrowed, 19-23 µm (r)
Pelomyxa flava
Detail of the cell above, with large glycogen bodies; in the centre a large vacuole,
Pelomyxa flava
Pelomyxa flava
Two types of endosymbionts
Ferry Siemensma, created March 3, 2019; last modified October 16, 2024
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