Microworld

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

Penardochlamys arcelloides

P. arcelloides – after Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Lachmannia spec.

“Lachmannia” spec., body length 127 µm “Lachmannia” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »

Diplophrys spec. 7

Diplophrys spec., with three tufts of filopodia Diplophrys spec. These cells are granular, never seen before. I found them in a sample from the Bert

Read More »

Psammonobiotus spec.

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

Read More »

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »