world of amoeboid organisms

Difflugia elegans angustata
Difflugia elegans var. angustata, Gaasterland, 2019

Difflugia elegans var. angustata  (Penard, 1890) Deflandre, 1926

Diagnosis: The variety differs from the type by its more slender pace and its smaller size and the commonly curved spine. The width is proportionately smaller, the mouth remaining substantially similar; nucleus with a limited number of nucleoli; nucleoli with small lacunae.

Dimensions: Length 61-96 µm (n=20); nucleus diameter 14.3 µm (n=1).

Remarks: I found this variety together with a population of of the typical D. elegans in Gaasterland, 2019. The distinction between both groups was clear. Maybe this is not a variety but a true species.

Difflugia elegans angustata
Difflugia elegans var. angustata, Gaasterland
Difflugia elegans - Ferry Siemensma
Difflugia elegans, all shells descended from one specimen which multiplied in a moist-chamber-mount, 79-86 µm long – Naardermeer, 2016.
Difflugia elegans - Ferry Siemensma
Difflugia elegans var. angustata, all shells from the same culture as above, 83-96 µm long – Naardermeer, the Netherlands
Difflugia elegans angustata
Difflugia elegans var. angustata, nucleus
Difflugia bicornis
D. elegans var. angustata; plot of a number of measurements of shells from the Gaasterland location, July 2019. It might be possible that D. bicornis falls within the variation of D. elegans, though the latter has smaller tests, but D. angustata seems a distinct species and not just a variety.
Recent posts

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 »

Tracheleuglypha elongata

T. elongata, A-C after Thomas and Gauthier-Lièvre, 1959; D after Van Oye, 1959 Tracheleuglypha elongata Van Oye, 1959 Diagnosis: Test similar to T. dentata, but

Read More »

Tracheleuglypha acolla

T. acolla, after Bonnet and Thomas, 1960 Tracheleuglypha acolla Bonnet and Thomas, 1955 Diagnosis: Test ovoid, non compressed, round in cross-section, with large oval overlapping

Read More »

Cyclopyxis kahli oblonga

C. kahli f. oblonga , after Tarnogradskii, 1959 Cyclopyxis kahli f. oblonga  (Tarnogradskii, 1959) Centropyxis kahli f. oblonga Tarnogradskii, 1959 Diagnosis:  Test with all the

Read More »