world of amoeboid organisms

Cyclopyxis impressa
Cyclopyxis impressa from Daday, 1905

Cyclopyxis impressa (Daday, 1905) Da Cunha, 1913
Difflugia lobostoma var. impressa Daday, 1905

Diagnosis: Shell in dorsal view circular, in side view it resembles a somewhat flattened hemisphere; the dorsal side is a bit bulbous; the ventral side is flat with a funnel-like invagination with the aperture. At the outer edge of the funnel is a more or less horizontal brim whose width is 1/3 or 1/4 of the whole shell diameter. The aperture is surrounded with 6-8 pointed chitinous teeth, dark brown or blackish gray, separated from each other by curves. Test embedded with mineral grains and particles.

Dimensions: Shell diameter 300-450 µm, height 100-150 µm; diameter of the funnel 150-190 µm.

Ecology: Freshwater. South-America (Asuncion, Lagoon (Pasito), inundations of the Paraguay River; Sapucay, Arroyo Pona, inundations of a stream; Tebicuay, pond.)

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 »