Cyclopyxis arcelloides – after Penard, 1902
Cyclopyxis arcelloides (Penard, 1902) Deflandre, 1929
Diagnosis. Shell circular to oval in apertural view, in lateral view flattended or hemispherical, brownish, thin, chitinous, covered with small flat mineral particles; pseudostome slightly invaginated, aperture about half the test diameter.
Dimensions: Shell diameter 93—112 µm; pseudostome 44—52 µm. My measurments: Diameter 82—110 µm.
Ecology: Freshwater, Sphagnum, submerged mosses.
Geographical distribution: Probably cosmopolitan.
Remarks: Van Oye (1951) describes a variety minima with a diameter of 40 µm.
C. arcelloides, Norway, 2023
C. arcelloides, lateral view; Norway, 2023
C. arcelloides minima, after Chardez, 1972
C. arcelloides, Ø 105 µm – Fochteloërveen
C. arcelloides, Ø 104×62 (l) and 112×77 µm (r)
C. arcelloides, Ø 93 (l) and 103×77 µm (r)
C. arcelloides, Ø 110 and 100 µm
C. arcelloides, Norway, 2023
C. arcelloides, lateral view, Norway, 2023
C. arcelloides, Norway, 2023
C. arcelloides, lateral view, Norway, 2023
C. arcelloides, Norway, 2023