Flamella arnhemensis
Flamella arnhemensis
Flamella arnhemensis

Flamella arnhemensis Kudryavtsev et al., 2009

Diagnosis: Locomotive form fan-shaped, with irregular anterior margin and numerous long trailing filaments; numerous long narrow subpseudopodia sometimes present. Spherical or ovoid vesicular nucleus, with a central nucleolus; large motile cells with up to 15–20 nuclei may be present in cultures. About 10 asynchronously working contractile vacuoles in the granuloplasm.
Cysts uninucleate 10.3–18 µm in diameter (average 13.3 µm); cyst wall 480–500 nm thick, consists of threelayers: inner most layer continuous, 40–60 nm thick; granular medium layer with ostioles and operculae (1.8–2.9 mm in diameter), 240–290 nm thick; fibrillar outer layer 190–290 nm thick, sometimes with a separated outer sheet (corresponding to ectocyst visible with LM) 110–140 nm thick.

Dimensions: length 13–34 µm (average 20 µm), breadth 23–69 µm (average 41 µm), l-b ratio 0.29–0.8 (average 0.49). Nucleus 3–8 µm (average 5.2 µm), nucleolus 1.5–4 µm (average 2.7 mm); my measurements: length 14–35 µm, breadth 38–58 µm; nucleus c. 4.5 µm, nucleolus c. 2.9 µm. They agree very well with the measurements made by Kudryavtsev et al.

Ecology: freshwater, aerobic, the Netherlands, Arnhem. I found this species in the Laegieskamp, also in the Netherlands.

Flamella arnhemensis
Flamella arnhemensis
Recent posts

Difflugia key bag-shaped

Tests that are bag or thumb-shaped Tests that are bag, finger or thumb-shaped.This group has no taxonomic significance. D. polliciformis D. lemani D. pecac D.

Read More »

Difflugia polliciformis

Difflugia polliciformis, after Van Oye, 1952 Difflugia polliciformis  Van Oye, 1958 Diagnosis: Test more or less thumb-shaped, without clear neck, chitinoid, mainly covered with very

Read More »

Difflugia australis

D. australis after Playfair, 1917 Difflugia australis (Playfair, 1917) Gauthier-Lièvre et Thomas, 1958 Syn.: Difflugia bacillariarum var. australis Playfair 1917 Diagnosis: Test broadly ovate, with

Read More »

Difflugia baradlana

D. baradlana after Varga, 1963 Difflugia baradlana Varga, 1963 Diagnosis: Test ovoid with a very small neck which is about 1/4 of the test length.

Read More »

Difflugia angelica

D. angelica after Gauthier-Lièvre et Thomas, 1960 Difflugia angelica Gauthier-Lièvre et Thomas, 1960 Diagnosis: Test spherical, slightly mammillated. Pseudostome regularly lobed like a star with

Read More »

Difflugia algaephila

D. algaephila after Decloitre, 1977 (l) and Chardez (1980) Difflugia algaephila Decloitre, 1977 Diagnosis: Test ovoid, neatly pointed, with oblique round pseudostome. Dimensions: Length 73-75

Read More »