Microworld

world of amoeboid organisms

Menu
Pyxidicula patens var.
Pyxidicula patens var., just after dividing

Pyxidicula patens var.

Diagnosis: Shell hemispherical, aperture nearly as large as the diameter of the shell; aperture bordered by a clear rim, which is a broadened extension of the shell wall; this rim has an alveolated structure; usually a hyaline veil is attached to the rim; it is usually curved inwards and strongly curved outwards and more or less undulated; nucleus single, spherical, with some dispersed spherical granules.

Dimensions: My measurements: 35-44 µm, nucleus c. 10 µm.

Ecology: freshwater, in Sphagnum from the Haaksbergerveen, and Kloosterhaar, the Netherlands. It was abundantly present in samples.

Remarks: This species differs from the nominal species by the structure and angle of its rim, which is thicker and not curved inward. The veil is large, seemingly hollow and often irregular shaped. It is difficult to imagine the real shape and structure of this veil. It is also hard to observe where this veil is attached to the shell. What looks like a flat broad rim, is in fact a wide depressed tubular ring.
All photomicrographs on this page show cells from the same sample.

Pyxidicula patens var.
Pyxidicula patens var.
Pyxidicula patens var., with pseudopodia (left) and hyaline fringe
Pyxidicula patens var.
Cross section of the shell, with the collar marked by arrows.
Pyxidicula patens var.
Pyxidicula patens var.
Living cell, lateral view, and shell, with nucleus (arrow)
Pyxidicula patens var.
Pyxidicula patens var.
Living cell, lateral view, with smooth veil; the rim or collar has an alveolated structure (arrow)
Pyxidicula patens var.
Pyxidicula patens var.
Rim, with alveoli and veil
Pyxidicula patens var.
Pyxidicula patens var.
Rim with alveoli and veil and shell without pronounced collar and without veil
Pyxidicula patens var.
Structure of a shell
Recent posts

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found three specimens of an agglutinated foraminifer in a sample collected

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »

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 »