world of amoeboid organisms

Menu
Difflugia globulosa
Difflugia globulosa, 94 µm

Difflugia globulosa (Dujardin, 1837) Penard, 1902

Diagnosis: Shell brown, spherical or hemispherical, usually composed of large quartz particles but may also include diatom frustules; general appearance rough, although some smoother forms have been seen; aperture circular and surrounded by smaller particles which often appear smooth due to the overlaying cement; variation in this species is prolific, both in the composition of the shell and the size of the aperture in relation to the diameter of the shell.

Dimensions: Literature: diameter of shell 91-155 µm (Dujardin: 100-250 µm, see remarks below).

Ecology: Freshwater. Peatbogs, between wet sphagnum; oligotrophic ponds.

Remarks: Shells of this species can be confused with those of Phryganella nidulus which are more flattened.
Penard (1902) described this species as having two distinct forms, the typical form and one varying between 135 and 155 µm. He also described two smaller forms 50 to 70 µm in size. Cash et al. (1909) described a small form (15-50 µm) under the name D. globulus, and suggested that Dujardin’s original description of D. globulosa was ambiguous. Dujardin described this species as spherical or ovoid and 100-250 µm large. Probably he observed at least two different species.

Difflugia globulosa, 133 µm
Difflugia globulosa, 122 µm
Difflugia globulosa
Original drawings of Penard (1902) in Faune Rhizopodique du Bassin du Lèman.
Difflugia globulosa
Recent posts

Spiculophrys

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 »

Kinetocyst

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 »