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

7

C. cordobenis, 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
Centropyxis ecornis, 244 µm in diameter – stacked image
Centropyxis ecornis
Centropyxis ecornis, 291 µm in diameter – stacked image
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
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