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Cyphoderia laevis
Cyphoderia laevis

Cyphoderia laevis Penard, 1902
= Schaudinnula nana Badewitz 2003

Diagnosis: shell small, colorless or faintly yellowish, with a rounded fundus; pseudostome circular, relatively large compaired with Cyphoderia ampulla. In cross-section circular or more or less rounded triangular. Faintly curved neck. Nucleus vesicular, granulated, with one or two nucleoli. Filopodia very fine, active.

Dimensions: Penard 35-50 µm; my measurements 41-61 µm.

Ecology: Penard: deep lakes (Lac Léman, Loch Ness) and borders of rivers; marshes.

Remarks: I have seen a few specimens of this small Cyphoderia in a sample from the river Neerbeek in the village of Neer in the southern part of the Netherlands, in the marshes around Kortenhoef and in the Weser river in Germany. A large population was found in an eutrophic ditch near the village of Pingjum in the northern part of the Netherlands, together with Cyphoderia ampulla.

Cyphoderia laevis
Cyphoderia laevis
Empty shell, surface of a shell, showing small oval plates.
Cyphoderia laevis
Cyphoderia laevis
Cross-section of central area. Pseudostome with tooth-like structures.
Cyphoderia laevis
Cyphoderia laevis
Cell with large contractile vacuole. Fundus
Cyphoderia laevis
Pseudostome
Cyphoderia laevis
Specimen with long filopodium.
Cyphoderia laevis
Cyphoderia laevis, cross-section
Cyphoderia laevis
Cyphoderia laevis, pseudostome
Cyphoderia laevis
Cyphoderia laevis, with large vacuole
Cyphoderia laevis, 49 µm
Schaudinnula
Schaudinnula
I found this shell in a sample from a palmtree oasis in Maroc, 2014. The fundus shows some scales.
Schaudinnula
Cyphoderia laevis, 31 µm, 1979 (drawing Ferry Siemensma)

Schaudinnula

Schaudinnula nana (= C. laevis), from Badewitz
Schaudinnula
Schaudinnula
Schaudinnula nana, from Badewitz
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