Macromonas fusiformis (Deflandre)

Most likely ID: n.a.


Synonym: n.a.


Sampling location: Simmelried


Phylogenetic tree: Macromonas fusiformis



  • length 15 -30 µm, width 1.5 – 2 µm
  • spindle-shaped, with parallel sides
  • large sulphure globules in a row
Macromonas fusiformis

I found Macromonas fusiformis in Simmelried in December 2005, October 2021 and September 2022. I could observe immobile as well as slowly swimming cells. In the case of the swimming cells no flagella were visible, despite thorougly observing with the 100 X objective. The specimens from the Simmelried were between 25 – 30 µm long. In each cell 5 – 12 large sulphur grains are arranged in a line.


Fig. 1: Macromonas fusiformis. A collection of cells from the December 2005 population. Obj. 100 X.


Fig. 2: Macromonas fusiformis. A sample with a dense population from September 2022. Obj. 40 X.


Fig. 3 a-b: Macromonas fusiformis. L = 29 µm. A large cell found in the population from October 2021. Obj. 100 X.