world of amoeboid organisms

Hyalosphenia spec.



Hyalosphenia spec.

Diagnose: shell transparent, colorless, yellow or brown, elongated oval with a truncate, more or less straight or slightly curved pseudostome; aperture nearly as broad as the shell; fundus broadly rounded or a little constricted; surface finely granulated; plasma usually partly filling the shell, with some epipodia; nucleus globular with a small nucleolus.

Dimensions: about 100-120 µm

Ecology: this species has been found in the ooze of a river near Oberndorf/Bremen in Germany. Food: mainly diatoms.

Remarks: this remarkable species was discovered by Steffen Clauss, Germany, who published some photomicrographs in a German Forum on the internet. According to his description he found about 50 specimens pro ml. ooze.

This species resembles H. penardi, but the latter is much larger (180 µm), has a nearly semi-circular aperture (“stark gewölbt”) and has no scale structure.

Hyalosphenia spec., fine structure of the shell
Recent posts

Polychaos spec.

Polychaos spec. Polychaos spec. Diagnosis: Large amoeba with an irregular more or less polypodial shape during slow locomotion; uroid finely papillated, usually very large fasciculate

Read More »


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 »