world of amoeboid organisms

Cyclopyxis stephanostoma
Cyclopyxis stephanostoma after Bonnet, 1980

Cyclopyxis stephanostoma Bonnet, 1980

Diagnosis: Test clearly circular in dorsal view and 3/4 spherical. Reduced pseudostome, located at the top of an abrupt funnel, generally cylindrical, or more rarely infundibuliform. Internal extremity of the funnel sometimes slightly flared, always lined internally by a crown of regular, refractive, smooth-edged siliceous platelets, smaller than the irregular plates of the wall of the funnel. In ventral view, the double contour of the pseudostome is clearly visible. Test embedded with plates of amorphous silica, always reworked, superimposed slightly, sometimes irregular, of the Heleopera petricola type, with possibly reworked remnants of diatoms, sometimes regular and identical, and from ingested euglyphids. The dorsal aspect is similar to Cyclopyxis machadoi Bonnet 1965 or Cyclopyxis dulcis Coûteaux and Munsch 1978.

Dimensions: Test diameter: 119-137 μm; height average 89.5 μm; aperture : 23-28 μm (n=11).

Ecology: Acid tropical forest soils, Paraguay and Philippines.

Remarks: This species is distinguished from: a) Cyclopyxis puteus Thomas, 1960 by the presence of the crown of refractive siliceous elements; (b) from C. machadoi Bonnet, 1965 by the absence of festoons and vestibular teeth; c) from C. dulcis Coûteaux and Munsch, 1978 by the tubular form of the invagination, the regularity of the elements of the crown and the test.

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 »