Rhogostoma cilindrica
R. cylindrica: (A) overview, front view; (D) lateral view of a dead cell, notethe slimness compared to front view and the empty theca that remains when individuals die. Scalebars: 2.5 µm. Abbreviations: a=aperture; g=granules; nu=nucleus.
 
 

Rhogostoma cilindrica Flues and Dumack, 2017

 

Diagnosis: Test cylindrical. Nucleus spherical, about 2–3 µm, with one spherical central nucleolus. Aperture cleft-like. Cells show a clear zonation (apical to basal): 1 zone of nucleus embedded in few granules, 2 food vacuoles, 3 aperture and contractile vacuoles, 4 filopodia or lamellipodia. Locomotion actively creeping, filopodia rarely extending to 30 µm. Prey mainly bacteria, potentially also very small eukaryotes. Cell division longitudinal, binary.

 

Dimensions: Test length 9.9–11.3 µm, width 4.8–7.5 µm.

 

Ecology: Soil.

 

Reference:

Dumack, K., Flues. S., Hermanns, K. and Bonkowski, M., 2017. Rhogostomidae (Cercozoa) from soils, roots and plant leaves (Arabidopsisthaliana): Description of Rhogostoma epiphylla sp. nov. and R. cylindrica sp. nov.; Eur. J. Protistol. 60: 76–86.