Cyphoderia calceolus
Cyphoderia calceolus

Cyphoderia calceolus Penard, 1899

Diagnosis: shell pyriform, with a strong curved dorsal part, resembling a croissant or boomerang, usually colorless or faintly yellow, composed of numerous more or less small circular scales; scales not overlapping; shell in cross-section circular or faintly compressed; aperture circular or broad-elliptical; curved neck; fundus hemispherical or  tapering to a more or less sharply-rounded apex; plasma with many dark granules; nucleus large, granular; fine straight filopodia.

Dimensions: Penard 155-185 µm; my measurements:

Ecology: debris of a small river in the Netherlands, some deep Swiss lakes.

Remarks: I have found this species in November 2011 in a sample from the Neerbeek-river in Neer, The Netherlands. In October 2012 I found this species in the river Weser near Bodenwerder, Germany.

Cyphoderia calceolus
Fine structure of the shell of Cyphoderia calceolus
Cyphoderia calceolus
Drawing: Penard (1902) in Faune Rhizopodique du Lac Léman
Cyphoderia calceolus
Cyphoderia calceolus, 148 µm – river Weser, Germany
Cyphoderia calceolus
Cyphoderia calceolus, 148 µm, the same speciemn as the one above – river Weser, Germany
Cyphoderia calceolus
Cyphoderia calceolus
Scales of Cyphoderia calceolus, Leitz DIC 100X
Cyphoderia calceolus
Cyphoderia calceolus, 93 µm – river Weser, Germany
Cyphoderia calceolus
>Crystals of Cyphoderia calceolus
Cyphoderia calceolus
Filopodia of Cyphoderia calceolus
Cyphoderia calceolus
Cyphoderia calceolus
Arrow indicates a thin collar around the aperture
Cyphoderia calceolus, both shells with sharply pointed apex
Cyphoderia calceolus
Cyphoderia calceolus, pseudostome with branching filopodia
Cyphoderia calceolus
Cyphoderia calceolus, stacked image
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