Microworld

world of amoeboid organisms

Menu
from Penard, 1902

Microcorycia penardi (Penard, 1902) Cockerell, 1911

Diagnosis: Upper test part rigid, dome-shaped, with a closed annular collar. The centre of the upper test part and the collar are covered more or less by xenosomes (mineral particles), the size and density of which decrease towards the collar. The upper test part is covered with xenosomes also outside the collar region; their size and density decreases even further towards the test margin where the upper test part gradually changes into the hyaline, xenosome-free lower test part. The upper test part outside the ring is covered with xenosomes only slightly, their size and density decreases towards the upper test part margin. With many individuals, the annular collar shows only a weak development or is completely missing. In the latter case, xenosomes are always circularly arranged. No matter how the upper test part is covered with xenosomes inside or outside the ring, the ring of xenosomes can well be made out. Color of upper test part brownish, also yellowish in the region outside the ring (Penard 1902) and finely punctuate. Digiform lobopodia and epipodia have not been observed. Frequently a widely rotund, lobate pseudopodium is extruded. The cell is mononuclear or binuclear (Penard 1902). The nucleus has got a central nucleolus.

Dimensions: Penard (1902): 100 µm on average, Chardez (1984): 90-110 µm, Badewitz (2004):  X = 99.3 (78-114) µm, n = 16.

Ecology: Terrestrial and limnetic(?) species. Predominantly moss, also sphagnum (Penard 1911, Heinis 1914). The moisture degree of mosses on the locality is usually not detailed. There is only the remark with Bartos (1940) and Badewitz (2003) that the species was found in aerophilic or xerophile mosses.

Remarks: Bartos (1940) reported on “abweichend gebaute Stücke” [differently structured individuals] of M. aculeata that “sehr nahe stehen” [are very similar] to M. penardi. With these individuals, the closed collar has regressed to form individual sharp points, the centre of the upper test part is covered with xenosomes (Fig. 9). It is, however, more probable that this was not M. aculeata, but atypical specimens of M. penardi. Sandon (1924) found it also in soil besides mosses, likewise Balik (1986), who indicated the soil as rendzina. Only Schmassmann (1924) found it in a limnetic habitat (sediment).

All from Badewitz, 2004

Microcorycia penardi
Microcorycia penardi. a = perspective view, b = test in section, c = test with contracted lower test part and upper test part in dorsal view with annularly arranged xenosomes. (Scales 100 µm).
From Badewitz, 2004
Microcorycia penardi
Microcorycia penardi – 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 »