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Pseudodifflugia spec.
Pseudodifflugia spec. with a tuft of debris on its fundus

Pseudodifflugia spec.

Diagnosis: Shell ovoid, rigid, in diameter circular or slightly compressed, organic, densely agglutinated with small mineral particles; aperture small, irregular shaped, flexible and variable in shape and size; nucleus hard to detect, because of the dense covering with xenosomes. Filopodia long, branching and anatomizing, with small veils. Living cells collect a bunch of debris around their pseudostome.

Dimensions: Length c. 64-79 µm, breadth 28-40 µm, aperture c. 3.6-6.7 µm.

Ecology: shallow freshwater pond, Crailoo, The Netherlands. Cells easily multiplied in wet mounts when kept in humidity chambers.

Remarks: Though the shell is ovoid, it occasionally bears a tuft of debris on its fundus, giving it the appearance of a pointed shell (see image below).

Ovoid shell bearing a pointed tuft of debris at its fundus.
Filopodia, branching and anastomosing
Three different shells with different irregular pseudostomes.
Pseudodifflugia with large collection of debris around its pseudostome.
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