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Pyxidicula
Pyxidicula patens – 39 µm

Genus Pyxidicula Ehrenberg, 1938

Diagnosis: shell patelliform or hemispherical, more or less rigid, transparent, speckled; aperture circular, almost the entire diameter of test, or somewhat contracted by an inward margin; a single nucleus; one or more contractile vacuoles.

1 Shell hemispherical 2
Shell flattened, like a disc 4
2 Aperture with a narrow recurved margin P. operculata
Aperture with two narrow margins or collars, one curved inwards, the other curved outwards 3
3 Outer collar broader than the inner rim, hyaline, thinner than the rest of the shell and somewhat undulated P. patens
Both collars relatively small with the same structure and color as the rest of the shell, not undulated Pyxidicula spec.
4 Shell with a flat margin P. cymbalum
Shell with a hollow or tube shaped margin P. invisitata
Pyxidicula operculata
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