world of amoeboid organisms

Parmulina louisi – from Chardez and Beyens, 1988

Parmulina louisi Chardez and Beyens, 1988

Diagnosis: Shell transparent, micro-perforate, ± soft with a somewhat dark, brownish-green tone. Shape almost hemispherical in lateral view. Chitinoid shell sometimes with a felty covering of organic particles. Large circular aperture, truncated at right angles, and surrounded by a well-developed rim, mostly more darkly colored than the other parts. Cytoplasm limpid, enclosing a spherical nucleus of 6.5 – 7 µm. Encystment normal, cyst globular with a distinct cyst membrane, ± smooth or irregularly toothed. In general, only a few broad, stumpy pseudopodia are evident; sometimes these were observed extending on the outer surface of the shell.

Dimensions: Length of shell: 46 – 50 µm, breadth of shell: 44 – 50 µm, diameter of aperture: 28 – 30 µm (n = 15).

Ecology: in mosses like Scorpidium, arctic Canada.

Remarks:This new species resembles Difflugia subaequalis Penard, but can clearly be distinguished by the structure of the shell and the smaller dimensions. The nature of the shell approaches that of Parmulina obtecta Gruber, from which it is easily differentiated by the shape of the aperture and more particularly by the conspicuous rim. This rim gives the otherwise ± soft shell a more rigid character, which is missing in Gruber’s species. Parmulina obtecta Gruber has a thin and flexible rim, able to retract and close the aperture.

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 »