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. Probably C. cordobensis has 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 ecornis
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