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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 specimen 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
Cyphoderia calceolus
C. calceolus, the Netherlands, 2020
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