world of amoeboid organisms

Pterocystis echinata
R. echinata – from Siemensma, 1991

Raineriophrys echinata (Rainer, 1968) Mikrjukov, 2000

Diagnosis: Cells with a diameter of 25-30 µm. Spine-scales 10-20 µm, with a strongly bent shaft, sub-centrally attached to a more or less circular or coniform basal plate. Laterally two small triangular wings connect the basal part of the shaft to the membrane. Both wings extend along the whole shaft as two narrow bands, ornamented with a small number of sharply pointed teeth. The plate-scales are oblong ovoid, 4.7 to 8.0 x 2.2-3.4 µm. The upper surface is slightly convex, the lower surface concave with a longitudinal rod-like axial protrusion. Surface structure smooth.

Ecology: Fresh waters, in Germany, The Netherlands, Central Russia.
I found this species several times in water with Sphagnum contact (Laegieskamp and Fochteloërveen) and also together with Acanthocystis dresscheri in a small moorland pool, pH 5.5, all in the Netherlands.

Pterocystis echinata
R. echinata, cyst, 20 µm
Raineriophrys echinata
Dried spine-scales showing the teeth on the shafts (arrowed)
Rainerophrys echinata
Recent posts

Penardochlamys arcelloides

P. arcelloides – from Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Reticulomyxa hannae

R. hannae, plasmodium – photomicrograph Steffen Clauss Reticulomyxa hannae Völcker and Clauß, 2020 Diagnosis: Trophozoites surrounded by a very thin mucous envelope, with slowly moving plasmodia, variable

Read More »

Velamentofex saxonensis

V. saxonensis, feeding (photomicrograph Steffen Clauss) Velamentofex saxonensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 30-95 μm, granuloreticulopodia up to 1000 μm long. with a hyaline, thin

Read More »

Velamentofex tyrolensis

V. tyrolensis (photomicrograph Steffen Clauss) Velamentofex tyrolensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 98-125 μm, with reticulopodia up to 300 μm long, with a hyaline,

Read More »

Velamentofex berolinensis

V. berolinensis Velamentofex berolinensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 50-300 µm, with a hyaline, extremely flexible, membranous test. Nuclei numerous, 11.6-16.2 µm in diameter,

Read More »


 Lieberkuehniidae  Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test very flexible, elongated to broadly

Read More »