Centropyxis discoides
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.

 

Centropyxis discoides
Centropyxis discoides
C. discoides, both from the same sample - on waterplants, the Netherlands
Centropyxis discoides
Centropyxis discoides
Nucleus and detail of edge
Centropyxis discoides
Centropyxis discoides
Specimen (235 µm) from Crailoo
Centropyxis discoides
Centropyxis discoides
C. discoides, 286 and 260 µm, both from the same sample
Centropyxis discoides
Centropyxis discoides
C. discoides, 225 and 245 µm in diameter, the Netherlands
Centropyxis discoides
 
C. discoides, side view, 253 µm in diameter
Centropyxis discoides
C. discoides, without spines, feeding on an algae
Centropyxis discoides
Shell 165 µm broad.  C. discoides, 226 µm, with many spines - Laegieskamp
Centropyxis discoides
Centropyxis discoides, 196 µm - Naardermeer
Centropyxis discoides
C. discoides, 235 µm
Centropyxis discoides
C. discoides, 224 µm - Crailoo
Centropyxis discoides
C. discoides, 248 µm - Crailoo
Centropyxis discoides
C. discoides, 245 µm