Microworld

world of amoeboid organisms

Menu
Centropyxis ecornis
Centropyxis ecornis, 258 and 326 µm in diameter – Laegieskamp

Centropyxis ecornis  (Ehrenberg, 1841)

Diagnosis: shell of large size, usually more than 200 µm, usually circular or largely elliptical, mostly irregular in outline; in lateral view the dorsal region is spherical and tapers from the mid-body position to the apertural lip; shell rough, covered with quartz sand grains, embedded in an organic cement; color usually grey, sometimes brownish, depending upon the density of the xenosomes; aperture invaginated, oval or circular, irregularly lobed, not very much eccentric, with a thick apertural rim.

Dimensions: literature 199-316 µm , mean 211 µm; my measurements 167-356 µm.

Ecology: freshwater; in sediments and among water plants and mosses.

Remarks: Probably several species are covered by the name C. ecornis. C. cordobensis might have been confused with this species.

Centropyxis ecornis
Centropyxis ecornis
C. ecornis, left: side view, 277 µm broad; left: dorsal view, 257 µm in diameter – Crailoo
Centropyxis ecornis
Centropyxis ecornis
C. ecornis, sideview; left: 257 µm in diameter and 200 µm high; right: 258 µm in diameter – Crailoo
Centropyxis cordobensis
C. cordobensis, after Vucetich, 1976. Compare his drawing (r.) with the specimen above (r.).
Centropyxis ecornis
Centropyxis ecornis
C. ecornis, 289 and 257 µm in diameter – Crailoo
Centropyxis ecornis, 244 µm in diameter – stacked image
Centropyxis ecornis
Centropyxis ecornis, 291 µm in diameter – stacked image
Centropyxis ecornis
Centropyxis ecornis
Centropyxis ecornis, 294 µm in diameter – stacked image
Centropyxis ecornis
Centropyxis ecornis, after Deflandre, 1929
Centropyxis ecornis
Centropyxis ecornis, after Leidy
Centropyxis ecornis
Centropyxis ecornis, after Leidy
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 »