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.

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

Schaudinnula

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

Raphidocystis glabra

after Zlatogursky et al., 2018 Raphidocystis glabra Dürrschmidt, 1985 Diagnosis: Periplast 40-50 μm in diameter; spine-scales 4.6–15 μm; plate-scales 6-7 × 3-3.5 μm; tiny teeth

Read More »

Raphidocystidae

Raphidocystidae Zlatogursky, 2018 Diagnosis: centrohelids with monolayered plate-scales covering cell surface. Plate-scales with a hollow inflected margin. Sometimes trumpet-shaped or tubular spine-scales present, forming an

Read More »

Planhoogenraadia liboica

P. liboica – from Bonnet, 1979 Planhoogenraadia liboica Bonnet, 1979 Diagnosis: . Test relatively flat, with a dorsal convexity. Shell widest in the center. Aperture deep

Read More »

Deharvengia papuensis

Deharvengia papuensis, after Bonnet, 1979 Deharvengia papuensis  Bonnet, 1979 Diagnosis: Theca large, ovoid, very regular, colorless. Elliptical pseudostome bordered by a thick yellowish lip or

Read More »