Microworld

world of amoeboid organisms

Menu
Paralieberkuehnia elegantula
Paralieberkuehnia elegantula, Crailoo, Netherlands

Genus Paralieberkuehnia De Saedeleer 1934

Diagnosis: Shell spherical to slightly ovoid, with distinct tubular neck, composed of an organic material, very fine granulated, without any embedded xenosomes; colorless to yellow-brown till dark-brown. Cytoplasm with an asymmetrical bundle of filopodia (peduncle or “Pseudopodienstiel”) which are granular (extrusomes),  thin, usually straight, and are able to branch and anastomose, thus forming a network or reticulum. Nucleus relatively large, globular with a central nucleolus. One or two contractile vacuoles.

Ecology: freshwater; shallow, iron rich water, between Spagnum, but also in small rivers.

Video: I made this video from material which came from the Geul, a small river at the border of Belgium and the Netherlands. This cell shows anastomising filopodia.

Remarks: The designation of genus Paralieberkuehnia is problematic. It was erected by De Saedeleer in 1934 for P. elegantula (Penard, 1904) which he made the type species. Penard describes his species based on the observation of three specimens from two different localities. The shell is as Penard writes “a perfect sphere” with a small tubular neck. De Saedeleer also found three similar specimens, however with an inner tubular structure. He states that Penard may have overlooked that structure.
De Saedeleer writes that Paralieberkuehnia is a free living and locomotive species, while Microgromia-species attach their shell  to the substrate. That is what I think makes any sense. But De Saedeleer doesn’t mention this characteristic in his diagnosis! The main difference between Microgromia and Paralieberkuehnia is, according to De Saedeleer, the presence of an inward tubular structure in the latter.
I’v seen numerous shells of L. elegans sensu Penard, but only twice shells with an inner tubular structure. I thinks those are different species, because the specimens with an inner tubular structure showed much more a reticulum, which I’ve never seen in L. elegans sensu Penard.
At this moment I think that genus Paralieberkuehnia is characterized by a spherical, non attached shell with straight free moving granulopodia, while Microgromia species have an attached shell with granulopodia appressed to the substrate.
I found this species in Waidring, Austria, Belgium and at several locations in the Netherlands.
An important difference between Paralieberkuehnia and Microgromia and Apogromia is that Paralieberkuehnia specimens aren’t attached to the substrate, while the other groups are sessile forms. You can often find specimens of Microgromia and Apogromia, and also Microcometes, attached to the cover glass. Their granulopodia are lying on the substrate, while Paralieberkuehnia specimens hang freely and stretch their granulopodia freely in the water around.

Paralieberkuehnia elegantula
Paralieberkuehnia elegantula
P. elegantula, after Penard, 1904 and after De Saedeleer, 1934
Paralieberkuehnia elegantula
Paralieberkuehnia elegantula
P. elegantula, after Hoogenraad and De Groot, 1940
Paralieberkuehnia elegantula
Shell with an inward tubular structure
Lieberkuehnia elegantula
Shell with an inward tubular structure
Recent posts

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. 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

L. epiouxi, after Chardez, 1984 3 Lagenodifflugia epiouxi (Chardez, 1983) new comb. Basionym: Pontigulasia epiouxi Chardez, 1983 Diagnosis: Shell elongate, circular in cross-section or very

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 »

Bullinularia maxima

Bullinularia maxima – from Bobrov and Mazei, 2020 Bullinularia maxima Bobrov et Mazei, 2020 Diagnosis: Shell brown, opaque, elliptical in ventral view; ventral surface is

Read More »

Bullinularia macroporum

Bullinularia macroporum – from Bobrov and Mazei, 2020 Bullinularia macroporum Bobrov et Mazei, 2020 Diagnosis: Shell yellow-brownish, transparent, circular in ventral view; ventral surface is

Read More »

Nebela golemanskyi

N. golemanskyi, after Todorov, 2010 Nebela golemanskyi Todorov, 2010 Diagnosis: Shell large, colourless and pyriform, with a distinct short neck about one fourth of the

Read More »

Nebela nebeloides

N. nebeloides, after Gauthier-Lièvre and Thomas, 1958 Nebela nebeloides (Gauthier-Lièvre and Thomas, 1958) Todorov et al., 2010 Basionym: Difflugia nebeloides Gauthier-Lièvre and Thomas, 1958 Diagnosis:

Read More »