world of amoeboid organisms

Microcorycia physalis, moss, Germany


Microcorycia physalis (Penard, 1917) Deflandre, 1927

Diagnosis: The upper test part is dome-shaped and has got 5, 6 or 8 radial stiffening ribs. The ribs are differently distinct; they may be slightly intimated to strip-like reinforced. Strip-like reinforced ribs are brown. The upper test part is brown to reddish brown, particularly with older individuals, but grey individuals that are colored like smoked glass or almost hyaline ones occur, too. The upper test part is covered with tiny regular spots, which become visible only at higher magnification (Penard 1917).
According to Penard€™s drawing, the dome-shaped upper test part is extended to form a tip (Penard PI. ll.F ig. 25, and 11.29). The centre of the upper test part is only slightly extended when the ribs are reinforced to a higher degree. The characteristics of M. physalis are highly variable.

Dimensions: Penard (1917): 55-65 µm, Badewitz (2004): mean 60.8 (49-70) µm, n = 21; nucleus 13-14 µm, nucleolus 5-7 µm.

Ecology: Moss, xerophile moss. Europe: Switzerland (Penard 1917), France (Deflandre 1927), Germany (Badewitz 2003).

Remarks: The cytoplasm is greyish and granulate. It contains food particles and excreta as well as contractile vacuoles in varying numbers. Epipodia have not been observed. Digiform pseudopodia are extruded according to Penard (1917), which also serve for locomotion. The cell contains a relatively large cell nucleus with a central nucleolus, which is well visible with many individuals.
Penard (1917) observed division stages. Division is of the transverse type. The test of mother cell can be recognized by its more intensive coloration and distinct costae. The test of daughter cell is, however, hyaline and costae are scarcely visible. Both tests are of the same size.

All from Badewitz, 2004


After Penard, 1917
from Badewitz, 2004
Recent posts

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

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

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 »