Microworld

world of amoeboid organisms

Menu
Menu
Difflugia nodosa
Difflugia nodosa complex, 356 µm (Naardermeer) l. and 522 µm (Groeneveld) r.

 
Difflugia nodosa (Leidy, 1879)

Diagnosis: Test large, robust, pyriform, compressed in cross-section; fundus with 1-4 blunt conical projections; zoochlorellae present; nucleus large, spherical with large and small granules.

Dimensions: Penard 350-420 µm long. My measurements: 317-522 µm, nucleus Ø 50-70 µm.

Ecology: I found numerous specimens in sediments of ditches around the nature reserve Naardermeer, in Gaasterland, Diepveen, Bert Bospad and in a forest pond at Groeneveld, all in the Netherlands. Locally not rare.

Remarks: This species was first described by Leidy (1879) as a variety of Difflugia (pyriformis) oblonga. Cash (1909) described a new species, Difflugia crassa, but this species is probably identical with Difflugia nodosa. The photomicrographs on this page probably show different species.

DNA-research (Blandenier et al., 2017) showed that D. nodosa is a cryptic morphospecies including at least two species.

Difflugia nodosa
 
Difflugia nodosa, 368-392 µm, Diepveen, where I’ve also found tests up to 470 µm
Difflugia nodosa
 
Difflugia nodosa, 314-440 µm, Diepveen
Difflugia nodosa
Difflugia nodosa
Nucleus of D. nodosa, 50 µm in diameter, in DIC (left) and normal illumination.
Difflugia nodosa
Difflugia nodosa
Nucleus of D. nodosa, 60 µm in diameter – from Diepveen.
Difflugia nodosa - Ferry Siemensma
Difflugia nodosa, 390 µm, Naardermeer, l., and 415 µm, Groeneveld, Baarn, r.
Difflugia nodosa
Difflugia nodosa, 317-400 µm – Naardermeer, Netherlands
Difflugia nodosa
Difflugia nodosa, 400 µm-490 µm – Groeneveld, the Netherlands
Difflugia nodosa
Difflugia nodosa, 390 µm (left) and 336 µm, Naardermeer, the Netherlands
Difflugia nodosa
Some isolated shells from Groeneveld, all c. 450 µm.
Difflugia nodosa
Difflugia nodosa, about 450 µm, Groeneveld
Difflugia nodosa
Difflugia nodosa
Difflugia nodosa, 450 µm, Groeneveld, l., and 322 µm, Kortenhoefse Plassen, r.
Difflugia nodosa, 470 µm – Den Treek, the Netherlands
Difflugia nodosa
D. nodosa, 480 µm – Crailoo, the Netherlands

 

Recent posts

Zivkovicia compressoidea

Zivkovicia compressoidea, from Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed, without any constriction between neck and

Read More »

Zivkovicia flexa

Zivkovicia flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »

Lagenodifflugia epiouxi

After Chardez, 1984 Lagenodifflugia epiouxi (Chardez, 1983) new comb. Basionym: Pontigulasia epiouxi Chardez, 1983 Diagnosis: Shell elongate, circular in cross-section or very slightly compressed. The

Read More »

Centropyxis lapponica

Centropyxis lapponica, after Grospietsch, 1954 Centropyxis lapponica  Grospietsch, 1954 Diagnosis: Shell nearly circular in circumference, without spines. Aperture clear square with rounded corners. Shell viewed

Read More »

Chaos spec. 6

Chaos spec., Crailoo, 2021 Chaos spec. This specimen was found in a samples from Crailoo, Netherlands. It was remarkable because of the absence of crystals.

Read More »