Centropyxis discoides – stacked
Centropyxis discoides Penard, 1902
Diagnosis: Shell usually more or less circular in outline, sometimes irregular, strongly flattened, dish shaped; usually with some hollow spines in the fundus region; shell composed of a granular organic material, embedded with some xenosomes, but never fully covered; aperture sometimes nearly centrally, irregular or lobed; some small pillars connect the invaginated aperture border with the dorsal surface. One single granular nucleus.
Dimensions: 135-320 µm
C. discoides, both from the same sample – on submerged plants, the Netherlands
Nucleus and detail of edge
Specimen (235 µm) from Crailoo
C. discoides, 286 and 260 µm, both from the same sample
C. discoides, 225 and 245 µm in diameter, the Netherlands
C. discoides, side view, 253 µm in diameter
C. discoides, without spines, feeding on an algae
C. discoides, 226 µm, with many spines – Laegieskamp
Centropyxis discoides, 196 µm – Naardermeer
C. discoides, 235 µm
C. discoides, 224 µm – Crailoo
C. discoides, 248 µm – Crailoo
C. discoides, 245 µm