world of amoeboid organisms



Argynnia dentistoma lacustris
Argynnia dentistoma var. lacustris, after Wailes, 1912

Argynnia dentistoma var. lacustris Wailes, 1912

Diagnosis: Test pyriform, a little elongate towards the pseudostome that is proportionally smaller and crenulated, abruptly cut off. Test very transparent, covered with siliceous, angular platelets and granules of various sizes, often mixed with diatom frustules.
This variety differs from A. dentistoma var. lacustris, due to the shape of its test and the relative size of the pseudostome, in turn having the largest size of the A. dentistoma complex.

Dimensions: Length 100 µm; width 80 µm; aperture 20 µm; other authors: length 120-206 µm, width 100-143 µm.

Ecology: Sphagnum

Recent posts


Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

Read More »

Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

Read More »

Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

Read More »

Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

Read More »


Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

Read More »

Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

Read More »