world of amoeboid organisms

Quadrulella quadrigera
Quadrulella quadrigera
Quadrulella quadrigera, Ecuador

Quadrulella quadrigera  Deflandre, 1936

Diagnosis: shell colorless, ovoid or slightly pyriform, sides convex or straight; surface composed of quadrangular or sometimes circular, siliceous shell plates, which are usually arranged in a regular manner, usually in rows, with all plates more or less of the same size; aperture straight, surrounded by a thin collar of organic cement.

Ecology: Sphagnum and moss.

Quadrulella quadrigera
Quadrulella quadrigera
Q. quadrigera, 117 and 126 µm.

Quadrulella quadrigera var. africana Gauthier-Lièvre and Thomas, 1961

Gauthier-Lièvre and Thomas (1961): “We attach to this species a very abundant Quadrulella in two stations of the Middle Congo and which we had first identified with Q. symmetrica; it differs from the latter by its ovoid theca coated with square or rectangular plates, sometimes, but more rarely oval, smaller and more regularly arranged. One side shows platelets juxtaposed in regular oblique series, the other side also has oblique but often intersecting series and, at least in the part near the pseudostome, the platelets strongly encroach on each other; it is on this face that we observed the oval platelets.
The specimens from the Middle Congo differ sufficiently from the type in their narrow pseudostome to motivate the creation of a variety: var. africana var. nov.
Test ovoid or subpyriform; main body broadly rounded, sides converging regularly towards a narrower pseudostome than in the type, truncated straight or very slightly convex, formed by a row of plates arranged like a straight collar with sometimes a thin chitinoid lip. Viewed laterally, the theca is claviform, compressed, with a non-indented pseudostome; the apical view is ellipsoid. Covered with square, rectangular plates, more rarely oval, transparent, of small dimensions.”

Quadrulella quadrigera africana
Quadrulella quadrigera var. africana, after Gauthier-Lièvre and Thomas, 1961
Recent posts


Fritz Schaudinn (1871 – 1906) was a German zoologist. He was the co-discoverer of the causative agent of syphilis and did research on amoebas, particularly

Read More »

Alabasta longicollis

Alabasta longicollis, after Penard, 1890 Alabasta longicollis  (Penard, 1890) Diagnosis: Test pyriform, very elongated (3 times as long as wide), transparent, very little compressed, embedded

Read More »

Alabasta kivuense

Alabasta kivuense, after Gauthier-Lièvre and Thomas, 1961 Alabasta kivuense  Gauthier-Lièvre and Thomas, 1961 Diagnosis: In frontal view, the test is finger-shaped with subparallel sides, the

Read More »

Paulinella micropora

Paulinella micropora, – from Lhee et al., 2017 Paulinella micropora Lhee, Yang, Kim, Andersen & Yoon, 2017 Diagnosis: Test elongate, with five columns of scales,

Read More »

Quadrulella tubulata

Quadrulella tubulata, after Gauthier-Lièvre, 1953 Quadrulella tubulata  Gauthier-Lièvre, 1953 Diagnosis: Shell almost lageniform, compressed, with rounded fundus and more or less irregularly arranged, commonly small,

Read More »

Quadrulella elongata

Quadrulella elongata, after Van Oye, 1952 Quadrulella elongata  Van Oye, 1952 Diagnosis: Test elongated with long neck and square plates, without any pores. Pseudosome slightly

Read More »